AN AEROSOL-GENERATOR COMPRISING A SUPPLY ELEMENT

Abstract

An aerosol-generator for an aerosol-generating device is provided, the aerosol-generator including: a surface acoustic wave atomiser including a substrate including an active surface defining at least one atomisation region, and at least one transducer positioned on the active surface to generate surface acoustic waves on the active surface; and a supply element arranged to supply a liquid aerosol-forming substrate to the atomisation region, the supply element including a channel extending through the substrate between an inlet to receive a supply of the liquid aerosol-forming substrate and an outlet positioned within the atomisation region of the active surface, in which the channel has at least one of a cross-sectional area that varies in a direction from the inlet to the outlet and a portion that extends in a non-perpendicular direction with respect to the active surface. An aerosol-generating device including the aerosol-generator is also provided.

Claims

1-14. (canceled)

15. An aerosol-generator for an aerosol-generating device, the aerosol-generator comprising: a surface acoustic wave atomiser comprising: a substrate comprising an active surface defining at least one atomisation region, and at least one transducer positioned on the active surface and being configured to generate surface acoustic waves on the active surface; and a supply element arranged to supply a liquid aerosol-forming substrate to the at least one atomisation region, the supply element comprising a channel extending through the substrate between an inlet configured to receive a supply of the liquid aerosol-forming substrate and an outlet positioned within the at least one atomisation region of the active surface, wherein the channel has at least one of a cross-sectional area that varies in a direction from the inlet to the outlet and a portion that extends in a non-perpendicular direction with respect to the active surface.

16. The aerosol-generator according to claim 15, wherein at least a portion of the channel has a cross-sectional area that increases in the direction from the inlet to the outlet.

17. The aerosol-generator according to claim 15, wherein at least a portion of the channel has a funnel shape, a conical shape, or a wedge shape.

18. The aerosol-generator according to claim 15, wherein at least a portion of the channel is curved.

19. The aerosol-generator according to claim 15, wherein at least a portion of the channel at the outlet is curved to form a continuous transition between the channel and the active surface.

20. The aerosol-generator according to claim 15, wherein at least a portion of the channel at the outlet extends tangentially with respect to the active surface.

21. The aerosol-generator according to claim 15, wherein the outlet comprises a first side and a second side opposite the first side, wherein the first side is positioned between the second side and the at least one transducer, wherein the channel comprises a first outlet portion at the first side of the outlet and a second outlet portion at the second side of the outlet, wherein the first outlet portion extends tangentially with respect to the active surface, and wherein the second outlet portion extends perpendicularly with respect to the active surface.

22. The aerosol-generator according to claim 15, wherein the substrate defines a recess at the active surface, wherein the recess extends between the at least one transducer and the outlet, wherein the substrate comprises a wall at least partially defining the recess, wherein the wall extends perpendicularly with respect to the active surface, and wherein the wall is positioned to reflect surface acoustic waves from the at least one transducer towards the outlet.

23. The aerosol-generator according to claim 15, wherein the channel comprises a plurality of interconnected channels extending through the substrate between the inlet and the outlet.

24. The aerosol-generator according to claim 23, wherein the inlet comprises a single inlet, wherein the outlet comprises a plurality of outlets, and wherein the plurality of interconnected channels provides fluid communication between the inlet and each of the plurality of outlets.

25. The aerosol-generator according to claim 23, wherein the outlet comprises a single outlet, wherein the inlet comprises a plurality of inlets, and wherein the plurality of interconnected channels provides fluid communication between the outlet and each of the plurality of inlets.

26. The aerosol-generator according to claim 15, wherein the substrate is a laminate material comprising a plurality of layers of substrate material, wherein at least one of the layers of substrate material defines the outlet, wherein at least one of the layers of substrate material defines the inlet, and wherein at least one of the layers of substrate material defines the channel.

27. An aerosol-generating device, comprising: an aerosol-generator according to claim 25; a controller configured to control the at least one transducer; a power supply; a first liquid storage portion configured to receive a first liquid aerosol-forming substrate, wherein the first liquid storage portion is in fluid communication with a first inlet of the plurality of inlets; and a second liquid storage portion configured to receive a second liquid aerosol-forming substrate, wherein the second liquid storage portion is in fluid communication with a second inlet of the plurality of inlets.

28. An aerosol-generating device, comprising: an aerosol-generator according to claim 15; a controller configured to control the at least one transducer; a power supply; and a liquid storage portion configured to receive a liquid aerosol-forming substrate, wherein the supply element is further arranged to supply liquid aerosol-forming substrate from the liquid storage portion to the at least one atomisation region.

Description

THE INVENTION WILL BE FURTHER DESCRIBED, BY WAY OF EXAMPLE ONLY, WITH REFERENCE TO THE ACCOMPANYING DRAWINGS, IN WHICH

[0092] FIG. 1 shows a top view of an aerosol-generator according to a first embodiment of the present disclosure;

[0093] FIG. 2 shows a cross-sectional view of the aerosol-generator of FIG. 1 taken along line 1-1;

[0094] FIG. 3 shows a perspective view of the channel of the aerosol-generator of FIG. 1;

[0095] FIG. 4 shows a top view of an aerosol-generator according to a second embodiment of the present disclosure;

[0096] FIG. 5 shows a cross-sectional view of the aerosol-generator of FIG. 4 taken along line 4-4;

[0097] FIG. 6 shows a perspective view of the channel of the aerosol-generator of FIG. 4;

[0098] FIG. 7 shows a top view of an aerosol-generator according to a third embodiment of the present disclosure;

[0099] FIG. 8 shows a cross-sectional view of the aerosol-generator of FIG. 7 taken along line 7-7;

[0100] FIG. 9 shows a perspective view of the channel of the aerosol-generator of FIG. 7;

[0101] FIG. 10 shows a first variation of the aerosol-generator of FIG. 8;

[0102] FIG. 11 shows a second variation of the aerosol-generator of FIG. 8;

[0103] FIG. 12 shows a top view of an aerosol-generator according to a fourth embodiment of the present disclosure;

[0104] FIG. 13 shows a cross-sectional view of the aerosol-generator of FIG. 12 taken along line 10-10;

[0105] FIG. 14 shows a perspective view of the aerosol-generator of FIG. 12;

[0106] FIG. 15 shows a top view of an aerosol-generator according to a fifth embodiment of the present disclosure;

[0107] FIG. 16 shows a cross-sectional view of the aerosol-generator of FIG. 15 taken along line 13-13;

[0108] FIG. 17 shows an exploded perspective view of the substrate of the aerosol-generator of FIG. 15;

[0109] FIG. 18 shows a cross-sectional view of an aerosol-generating device comprising the aerosol-generator of FIG. 15;

[0110] FIG. 19 shows a cross-sectional view of an aerosol-generator according to a sixth embodiment of the present disclosure;

[0111] FIG. 20 shows an exploded perspective view of the substrate of the aerosol-generator of FIG. 19; and

[0112] FIG. 21 shows a cross-sectional view of an aerosol-generating device comprising the aerosol-generator of FIG. 19.

[0113] FIGS. 1 and 2 show an aerosol-generator 100 according to a first embodiment of the present disclosure. The aerosol-generator 100 comprises a surface acoustic wave atomiser 102 and a supply element 104 for supplying a liquid aerosol-forming substrate to the surface acoustic wave atomiser 102.

[0114] The surface acoustic wave atomiser 102 comprises a substrate 106 comprising a sheet of piezoelectric material, and a transducer 108 arranged on an active surface 110 of the substrate 106. The transducer 108 comprises a first array of electrodes 112 and a second array of electrodes 114 interleaved with the first array of electrodes 112. The first and second arrays of electrodes 112, 114 are curved and parallel with each other. During use, the transducer 108 generates surface acoustic waves on the active surface 110 of the substrate 106. The curved shape of the first and second arrays of electrodes 112, 114 results in surface acoustic waves having a concave wavefront focussed towards an atomisation region 116 on the active surface 110 of the substrate 106.

[0115] The supply element 104 comprises a channel 118 extending through the substrate 106 between an inlet 120 at a passive surface 122 of the substrate 106 and an outlet 124 at the active surface 110 of the substrate 106. The outlet 124 is positioned within the atomisation region 116. During use, a liquid aerosol-forming substrate is supplied through the channel 118 to the atomisation region 116 where it is atomised by surface acoustic waves generated by the transducer 108.

[0116] As shown in FIG. 3, which shows a perspective view of the channel 118, the channel 118 has a cross-sectional area that varies in a direction from the inlet 120 to the outlet 124. In particular, the channel 118 has a funnel shape so that the cross-sectional area of the channel 118 increases in the direction from the inlet 120 to the outlet 124. The smaller cross-sectional area of the channel 118 at the inlet 120 facilitates control of the flow rate of liquid aerosol-forming substrate into the channel 118. The larger cross-sectional area of the channel 118 at the outlet 124 provides a larger surface area of liquid aerosol-forming substrate at the atomisation region 116 to facilitate atomisation of the liquid aerosol-forming substrate. The curved transition at the inlet 120 between the active surface 110 and the channel 118 facilitates the transfer of energy from the surface acoustic waves to the liquid aerosol-forming substrate.

[0117] FIGS. 4 and 5 show an aerosol-generator 200 according to a second embodiment of the present disclosure. The aerosol-generator 200 comprises a surface acoustic wave atomiser 202 and a supply element 204 for supplying a liquid aerosol-forming substrate to the surface acoustic wave atomiser 202.

[0118] The surface acoustic wave atomiser 202 comprises a substrate 206 comprising a sheet of piezoelectric material, and a transducer 208 arranged on an active surface 210 of the substrate 206. The transducer 208 comprises a first array of electrodes 212 and a second array of electrodes 214 interleaved with the first array of electrodes 212. The first and second arrays of electrodes 212, 214 are linear and parallel with each other. During use, the transducer 208 generates surface acoustic waves on the active surface 210 of the substrate 206. The linear shape of the first and second arrays of electrodes 212, 214 results in surface acoustic waves having a linear wavefront directed towards an atomisation region 216 on the active surface 210 of the substrate 206.

[0119] The supply element 204 comprises a channel 218 extending through the substrate 206 between an inlet 220 at a passive surface 222 of the substrate 206 and an outlet 224 at the active surface 210 of the substrate 206. The outlet 224 is positioned within the atomisation region 216. During use, a liquid aerosol-forming substrate is supplied through the channel 218 to the atomisation region 216 where it is atomised by surface acoustic waves generated by the transducer 208.

[0120] As shown in FIG. 6, which shows a perspective view of the channel 218, the channel 218 has a cross-sectional area that varies in a direction from the inlet 220 to the outlet 224. In particular, the channel 218 has a wedge shape so that the cross-sectional area of the channel 218 increases in the direction from the inlet 220 to the outlet 224. The smaller cross-sectional area of the channel 218 at the inlet 220 facilitates control of the flow rate of liquid aerosol-forming substrate into the channel 218. The larger cross-sectional area of the channel 218 at the outlet 224 provides a larger surface area of liquid aerosol-forming substrate at the atomisation region 216 to facilitate atomisation of the liquid aerosol-forming substrate.

[0121] FIGS. 7 and 8 show an aerosol-generator 300 according to a third embodiment of the present disclosure. The aerosol-generator 300 comprises a surface acoustic wave atomiser 302 and a supply element 304 for supplying a liquid aerosol-forming substrate to the surface acoustic wave atomiser 302.

[0122] The surface acoustic wave atomiser 302 comprises a substrate 306 comprising a sheet of piezoelectric material, and a transducer 308 arranged on an active surface 310 of the substrate 306. The transducer 308 comprises a first array of electrodes 312 and a second array of electrodes 314 interleaved with the first array of electrodes 312. The first and second arrays of electrodes 312, 314 are linear and parallel with each other. During use, the transducer 308 generates surface acoustic waves on the active surface 310 of the substrate 306. The linear shape of the first and second arrays of electrodes 312, 314 results in surface acoustic waves having a linear wavefront directed towards an atomisation region 316 on the active surface 310 of the substrate 306.

[0123] The surface acoustic wave atomiser 302 also comprises a reflector 330 positioned on the active surface 310 of the substrate 306 so that the atomisation region 316 is positioned between the transducer 308 and the reflector 330. The reflector 330 comprises an array of reflector electrodes 332 each having a linear shape and arranged parallel with each other and the first and second arrays 312, 314 of electrodes of the transducer 308. During use, some of the surface acoustic waves generated by the transducer 308 may be transmitted entirely through the atomisation region 316. The reflector 330 functions to reflect any transmitted surface acoustic waves back towards the atomisation region 316.

[0124] The supply element 304 comprises a channel 318 extending through the substrate 306 between an inlet 320 at a passive surface 322 of the substrate 306 and an outlet 324 at the active surface 310 of the substrate 306. The outlet 324 is positioned within the atomisation region 316. During use, a liquid aerosol-forming substrate is supplied through the channel 318 to the atomisation region 316 where it is atomised by surface acoustic waves generated by the transducer 308.

[0125] As shown in FIG. 9, which shows a perspective view of the channel 318, the channel 318 has a cross-sectional area that varies in a direction from the inlet 320 to the outlet 324. In particular, the channel 318 has a curved wedge shape so that the cross-sectional area of the channel 318 increases in the direction from the inlet 320 to the outlet 324. The smaller cross-sectional area of the channel 318 at the inlet 320 facilitates control of the flow rate of liquid aerosol-forming substrate into the channel 318. The larger cross-sectional area of the channel 318 at the outlet 324 provides a larger surface area of liquid aerosol-forming substrate at the atomisation region 316 to facilitate atomisation of the liquid aerosol-forming substrate. The curved transition at the inlet 320 between the active surface 310 and the channel 318 at the side of the channel 318 closest to the transducer 308 facilitates the transfer of energy from the surface acoustic waves to the liquid aerosol-forming substrate.

[0126] FIG. 10 shows a first variation of the aerosol-generator 300 of FIGS. 7 and 8. In the first variation shown in FIG. 10, the channel 318 has a cross-sectional shape that decreases in the direction from the inlet 320 to the outlet 324.

[0127] FIG. 11 shows a second variation of the aerosol-generator 300 of FIGS. 7 and 8. In the second variation shown in FIG. 11, the channel 318 extends in a non-perpendicular direction with respect to the active surface 310. In particular, the channel 318 has a substantially linear cross-sectional shape and is inclined towards the transducer 308. Advantageously, inclining the channel 318 towards the transducer 308 facilitates the transfer of energy from the surface acoustic waves to the liquid aerosol-forming substrate and increases the mechanical stability of the substrate 306 at the outlet 324.

[0128] FIGS. 12, 13 and 14 show an aerosol-generator 400 according to a fourth embodiment of the present disclosure. The aerosol-generator 400 comprises a surface acoustic wave atomiser 402 and a supply element 404 for supplying a liquid aerosol-forming substrate to the surface acoustic wave atomiser 402.

[0129] The surface acoustic wave atomiser 402 comprises a substrate 406 comprising a sheet of piezoelectric material, and a transducer 408. The substrate 406 comprises a plurality of walls 442 defining a recess 440 in a surface of the substrate 406. The transducer 408 is arranged on an active surface 410 of the substrate 406 within the recess 440.

[0130] The transducer 408 comprises a first array of electrodes 412 and a second array of electrodes 414 interleaved with the first array of electrodes 412. The first and second arrays of electrodes 412, 414 are linear and parallel with each other. During use, the transducer 408 generates surface acoustic waves on the active surface 410 of the substrate 406. The linear shape of the first and second arrays of electrodes 412, 414 results in surface acoustic waves having a linear wavefront directed towards an atomisation region 416 on the active surface 410 of the substrate 406.

[0131] The supply element 404 comprises a channel 418 extending through the substrate 406 between an inlet 420 at a passive surface 422 of the substrate 406 and an outlet 424 at the active surface 410 of the substrate 406. The outlet 424 is positioned within the recess 440 and the atomisation region 416. During use, a liquid aerosol-forming substrate is supplied through the channel 418 to the atomisation region 416 where it is atomised by surface acoustic waves generated by the transducer 408.

[0132] As shown in FIG. 9, which shows a perspective view of the aerosol-generator 400, the channel 418 has a cross-sectional area that varies in a direction from the inlet 420 to the outlet 424. In particular, the channel 418 has a curved wedge shape so that the cross-sectional area of the channel 418 increases in the direction from the inlet 420 to the outlet 424. The smaller cross-sectional area of the channel 418 at the inlet 420 facilitates control of the flow rate of liquid aerosol-forming substrate into the channel 418. The larger cross-sectional area of the channel 418 at the outlet 424 provides a larger surface area of liquid aerosol-forming substrate at the atomisation region 416 to facilitate atomisation of the liquid aerosol-forming substrate. The curved transition at the inlet 420 between the active surface 410 and the channel 418 at the side of the channel 418 closest to the transducer 408 facilitates the transfer of energy from the surface acoustic waves to the liquid aerosol-forming substrate.

[0133] The plurality of walls 442 defining the recess 440 comprises a pair of angled walls 444 arranged to reflect surface acoustic waves generated by the transducer 408 towards the atomisation region 416. The plurality of walls 442 also comprises a back wall 446 arranged to reflect any surface acoustic waves propagating from the transducer 408 in a direction away from the atomisation region 416 back towards the atomisation region 416. The plurality of walls 442 also comprises a front wall 448 that partially defines the inlet 424 and is also arranged to reflect any surface acoustic waves that are transmitted entirely through the atomisation region 416 back into the atomisation region 416. Advantageously, the walls 444, 446 and 448 increase or maximise the energy transferred from the surface acoustic waves to liquid aerosol-forming substrate in the atomisation region 416.

[0134] FIGS. 15 and 16 show an aerosol-generator 500 according to a fifth embodiment of the present disclosure. The aerosol-generator 500 comprises a surface acoustic wave atomiser 502 and a supply element 504 for supplying a liquid aerosol-forming substrate to the surface acoustic wave atomiser 502.

[0135] The surface acoustic wave atomiser 502 comprises a substrate 506 comprising a sheet of piezoelectric material, a first transducer 508 and a second transducer 509. The first and second transducers 508, 509 are arranged on an active surface 510 of the substrate 506.

[0136] Each of the first and second transducers 508, 509 comprises first and second arrays of electrodes as described with respect to the transducer 108 of FIG. 1. The first and second arrays of electrodes of each of the first and second transducers 508, 509 are curved and parallel with each other. During use, each of the first and second transducers 508, 509 generates surface acoustic waves on the active surface 510 of the substrate 506. The curved shape of the first and second arrays of electrodes of the first transducer 508 results in surface acoustic waves having a concave wavefront focussed towards a first atomisation region 516 on the active surface 510 of the substrate 506. The curved shape of the first and second arrays of electrodes of the second transducer 509 results in surface acoustic waves having a concave wavefront focussed towards a second atomisation region 517 on the active surface 510 of the substrate 506.

[0137] The supply element 504 comprises a plurality of interconnected channels extending through the substrate 506 between an inlet 520 at a passive surface 522 of the substrate 506 and first and second outlets 524, 525 at the active surface 510 of the substrate 506. The first outlet 524 is positioned within the first atomisation region 516 and the second outlet 525 is positioned within the second atomisation region 517.

[0138] The plurality of interconnected channels comprises an inlet channel 523, a transverse channel 521, a first outlet channel 518 and a second outlet channel 519. The inlet channel 523 extends from the inlet 520. The transverse channel 521 is in fluid communication with the inlet channel 523. The first outlet channel 518 extends between a first end of the transverse channel 521 and the first outlet 524. The second outlet channel 519 extends between a second end of the transverse channel 521 and the second outlet 525. During use, a liquid aerosol-forming substrate is supplied through the plurality of interconnected channels to the first atomisation region 516 and the second atomisation region 517 where it is atomised by surface acoustic waves generated by the first transducer 508 and the second transducer 509.

[0139] As shown in FIG. 17, which shows an exploded perspective view of the substrate 506, the substrate 506 is formed from a plurality of layers of substrate material to facilitate the formation of the plurality of interconnected channels. In particular, the substrate 506 comprises first, second and third layers 550, 552, 554 of substrate material. The first layer 550 of substrate material defines the first and second outlet channels 518, 519. The second layer 552 of substrate material defines the transverse channel 521. The third layer 554 of substrate material defines the inlet channel 523. The first, second and third layers 550, 522, 524 of substrate material are adhered together to form the substrate 506.

[0140] FIG. 18 shows a cross-sectional view of an aerosol-generating device 600 comprising the aerosol-generator 500. The aerosol-generating device 600 also comprises a liquid storage portion 602 containing a liquid aerosol-forming substrate 604, and a flow control element 606 comprising a micro-pump. The micro-pump is arranged to supply the liquid aerosol-forming substrate 604 from the liquid storage portion 602 to the inlet 520 of the aerosol-generator 500.

[0141] The aerosol-generating device 600 also comprises a power supply 608 comprising a rechargeable battery, and a controller 610. The controller 610 is configured to provide control signals to the flow control element 606 to control a flow rate of the liquid aerosol-forming substrate 604 from the liquid storage portion 602 to the inlet 520 of the aerosol-generator 500. The controller 610 is also configured to supply an electrical current from the power supply 608 to the aerosol-generator 500 to drive the first and second transducers 508, 509.

[0142] The aerosol-generating device 600 also comprises a housing 612 in which the aerosol-generator 500, the liquid storage portion 602, the flow control element 606, the power supply 608 and the controller 610 are contained. The housing 612 defines an air inlet 614, a mouthpiece 616, and an air outlet 618. During use, a user draws on the mouthpiece 616 to draw air through the housing 612 from the air inlet 614 to the air outlet 618. Aerosol generated by the aerosol-generator 500 is entrained in the airflow through the housing 612 for delivery to the user.

[0143] FIG. 19 shows a cross-sectional view of an aerosol-generator 700 according to a sixth embodiment of the present disclosure. The aerosol-generator 700 comprises a surface acoustic wave atomiser 702 and a supply element 704 for supplying a liquid aerosol-forming substrate to the surface acoustic wave atomiser 702.

[0144] The surface acoustic wave atomiser 702 comprises a substrate 706 comprising a sheet of piezoelectric material, and a transducer 708 arranged on an active surface 710 of the substrate 706. The transducer 708 is identical to the transducer 108 described with respect to FIG. 1.

[0145] The supply element 704 comprises a plurality of interconnected channels extending through the substrate 706 between first and second inlets 720, 721 at a passive surface 722 of the substrate 706 and an outlets 724 at the active surface 710 of the substrate 706.

[0146] The plurality of interconnected channels comprises a first inlet channel 723, a second inlet channel 727, a transverse channel 721, and an outlet channel 718. The first inlet channel 723 extends from the first inlet 720. The second inlet channel 727 extends from the second inlet 721. The transverse channel 721 is in fluid communication with the first inlet channel 723 and the second inlet channel 727. The outlet channel 718 extends between the transverse channel 721 and the outlet 724. Advantageously, a first liquid aerosol-forming substrate may be supplied to the first inlet 720 and a second liquid aerosol-forming substrate may be supplied to the second inlet 721. Advantageously, the first and second liquid aerosol-forming substrates may mix in the plurality of interconnected channels during use to form a mixed liquid aerosol-forming substrate. During use, the mixed liquid aerosol-forming substrate is supplied through the plurality of interconnected channels to the outlet 724 for atomisation by surface acoustic waves generated by the transducer 708.

[0147] As shown in FIG. 20, which shows an exploded perspective view of the substrate 706, the substrate 706 is formed from a plurality of layers of substrate material to facilitate the formation of the plurality of interconnected channels. In particular, the substrate 706 comprises first, second and third layers 750, 752, 754 of substrate material. The first layer 750 of substrate material defines the outlet channel 718. The second layer 752 of substrate material defines the transverse channel 721. The third layer 754 of substrate material defines the first and second inlet channels 723, 727. The first, second and third layers 750, 722, 724 of substrate material are adhered together to form the substrate 706.

[0148] FIG. 21 shows a cross-sectional view of an aerosol-generating device 800 comprising the aerosol-generator 700. The aerosol-generating device 800 also comprises a first liquid storage portion 802 containing a first liquid aerosol-forming substrate 804, a second liquid storage portion 803 containing a second liquid aerosol-forming substrate 805, and first and second flow control elements 806, 807 each comprising a micro-pump. The first flow control element 806 is arranged to supply the first liquid aerosol-forming substrate 804 from the first liquid storage portion 802 to the first inlet 720 of the aerosol-generator 700. The second flow control element 807 is arranged to supply the second liquid aerosol-forming substrate 805 from the second liquid storage portion 803 to the second inlet 721 of the aerosol-generator 700.

[0149] The aerosol-generating device 800 also comprises a power supply 808 comprising a rechargeable battery, and a controller 810. The controller 810 is configured to provide control signals to the first and second flow control elements 806, 807 to control flow rates of the first and second liquid aerosol-forming substrates 804 to the first and second inlets 720, 721 of the aerosol-generator 700. The controller 810 is also configured to supply an electrical current from the power supply 808 to the aerosol-generator 700 to drive the transducer 708.

[0150] The aerosol-generating device 800 also comprises a housing 812 in which the aerosol-generator 700, the first and second liquid storage portions 802, 803, the first and second flow control elements 806, 807, the power supply 808 and the controller 810 are contained. The housing 812 defines an air inlet 814, a mouthpiece 816, and an air outlet 818. During use, a user draws on the mouthpiece 816 to draw air through the housing 812 from the air inlet 814 to the air outlet 818. Aerosol generated by the aerosol-generator 700 is entrained in the airflow through the housing 812 for delivery to the user.