A method for determining a flow rate of a fluid includes positioning a tubular within a wellbore formed in a subsurface formation, wherein a flow of fluid is to move through the tubular. An orifice plate is positioned in the tubular. The orifice plate is movable between a first position and a second position to alter a flow area of the flow of fluid moving through the tubular. The method includes detecting a change in a downhole attribute that changes in response to the alteration of the flow area of the flow of fluid. Sensors positioned within or in communication with an interior of the tubular can detect the change in the downhole attribute. The method further includes determining a flow rate of the flow of fluid based on the detected change in the downhole attribute. The flow of fluid may be single phase or multiphase.

A throttling component and a conditioning and flowrate measurement device including a throttling component. The throttling component comprises a central throttling element and multiple peripheral throttling elements. The multiple peripheral throttling elements are sequentially sleeved on the exterior of the central throttling element, and are coaxial to the central throttling element; annular fluid channels are respectively formed between the central throttling element and its adjacent peripheral throttling element, and between adjacent peripheral throttling elements. A sensitive and clear differential pressure signal is generated while the throttling component stabilizes the flow, so that the accuracy and reliability of flowrate measurement can be improved.

A method for estimating a flow rate of a material (e.g., a multiphase fluid) may include: flowing the material through one or more of a plurality of receptacles of a dielectric contrast analysis structure that includes: a bulk dielectric substance and the plurality of receptacles in the bulk dielectric substance; exposing the dielectric contrast analysis structure to incident electromagnetic radiation; detecting and analyzing a resultant electromagnetic radiation from the exposed dielectric contrast analysis structure to yield a phase fraction in the material and a phase distribution in the material; measuring a differential pressure across the dielectric contrast analysis structure; and estimating the flow rate of the material using the differential pressure, the phase fraction, and the phase distribution in the material.

A connection device, for mechanical ventilation and monitoring of spontaneous breathing of a patient (P), includes a fluid-guiding unit (9, 11, 15) and establishes a fluid connection between a medical arrangement (100) and a patient-side coupling unit (19). A volume flow sensor (90) measures an indicator of volume flow of fluid through the fluid-guiding unit. A volume flow sensor component (2) engages with an interior of the fluid-guiding unit. A homogenization unit (10) is nonrotatably inserted into the interior between the patient-side coupling unit and the component and includes two sieves and a connection element, which connects the sieves together. The homogenization unit homogenizes the flow of fluid through the fluid-guiding unit. An inner profile of the fluid-guiding unit and an outer profile of the homogenization unit together form a mechanical coding, which determines a defined rotation position of the homogenization unit in relation to the fluid-guiding unit.

A venturi flowmeter includes a ring of which the inside is hollow and which prevents inner wall abrasion or fatigue load accumulation at a main orifice and thus can reduce maintenance costs. The venturi flowmeter includes a main orifice of which the inside is hollow and an element of which one side has a hollow inside having the same diameter as that of a through-hole of the main orifice, and which has a tapered shape toward the other side thereof. A diffuser has one side having a hollow inside of the same diameter as that of the through-hole of the main orifice, and which has a tapered shape toward the other side thereof. A ring is connected between the main orifice and one side of the element. The ring includes a stopper formed along an inner wall and having a hollow central portion.

A venturi flowmeter includes a ring of which the inside is hollow and which prevents inner wall abrasion or fatigue load accumulation at a main orifice and thus can reduce maintenance costs. The venturi flowmeter includes a main orifice of which the inside is hollow and an element of which one side has a hollow inside having the same diameter as that of a through-hole of the main orifice, and which has a tapered shape toward the other side thereof. A diffuser has one side having a hollow inside of the same diameter as that of the through-hole of the main orifice, and which has a tapered shape toward the other side thereof. A ring is connected between the main orifice and one side of the element. The ring includes a stopper formed along an inner wall and having a hollow central portion.

A first flow path member has a first sealing surface for supporting one end surface, in a central axis direction, of an annular seal member, and a second flow path member has a second seal surface including a flat surface for supporting a surface of a plate-like member, and a third seal surface for supporting an outer peripheral surface of the annular seal member, wherein: in the annular seal member, an other end surface of the annular seal member is pressed against the back surface of the plate-like member, the one end surface of the annular seal member is pressed against the first seal surface of the first flow path member, and the outer peripheral surface of the annular seal member is pressed against the third seal surface of the second flow path member; and the plate-like member is pressed by the other end surface of the annular seal member.

A self-correcting pressure-based mass flow control apparatus includes outlet pressure sensing to enable correction for non-ideal operating conditions. Further the mass flow control apparatus having a fluid pathway, a shutoff valve in the fluid pathway, a reference volume in the fluid pathway, a first pressure measuring sensor in fluid communication with the reference volume, a first temperature measuring sensor providing a temperature signal indicative of the fluid temperature within the reference volume, a proportional valve in the fluid pathway, and a second pressure measuring sensor in fluid communication with the fluid pathway.

A self-correcting pressure-based mass flow control apparatus includes outlet pressure sensing to enable correction for non-ideal operating conditions. Further the mass flow control apparatus having a fluid pathway, a shutoff valve in the fluid pathway, a reference volume in the fluid pathway, a first pressure measuring sensor in fluid communication with the reference volume, a first temperature measuring sensor providing a temperature signal indicative of the fluid temperature within the reference volume, a proportional valve in the fluid pathway, and a second pressure measuring sensor in fluid communication with the fluid pathway.

A flow meter system and method are provided for monitoring gas flow in a conduit. The flow meter system includes a plurality of components including: a sensor for sensing a flow rate of the gas flow; a communication device for transmitting information corresponding to the sensed flow rate to a remote device; an energy harvesting device for producing electrical energy from the gas flow to power operation of the communication device or other component of the flow meter system; and an energy storage device for storing electrical energy generated by the energy harvesting device.