A fluid flow rate measurement device includes: a manifold element including a first fluid conduit extending from a surface thereof and terminating in a first port opening at a first lateral surface thereof and a second port opening at a second lateral surface thereof, and a second fluid conduit extending from a surface thereof and terminating in a third port opening at the first lateral surface and a fourth port opening at the second lateral surface; a fluid restriction element fixed to the first lateral surface and arranged to provide a sealed fluid pathway between the first port and the third port; and—a pressure sensor assembly fixed to the second lateral surface and including a first pressure sensor in fluidic communication with the second port, and a second pressure sensor in fluidic communication with the fourth port.

The present invention discloses a negative pressure wave monitoring based leak detection method of a multipath pipeline network, including: analyzing a propagation process of a negative pressure wave in a single straight pipeline to obtain a calculated result of a sound velocity in a thin-walled pipe marking the pressure sensors at known disposing positions on a pipeline network map; linearly interpolating position coordinates of key nodes in the pipeline network to extend pipeline network information; resolving the time that a negative pressure wave signal generated by a leak propagates to each disposed RTUs to form a data column; and simulating a leak situation, detecting a pipeline pressure waveform by using the RTUs in a current network, and determining a point corresponding to the data column closest to a measured propagation time delay in the time delay standard library as a leak point, and outputting the position of the leak point.

The present invention discloses a negative pressure wave monitoring based leak detection method of a multipath pipeline network, including: analyzing a propagation process of a negative pressure wave in a single straight pipeline to obtain a calculated result of a sound velocity in a thin-walled pipe marking the pressure sensors at known disposing positions on a pipeline network map; linearly interpolating position coordinates of key nodes in the pipeline network to extend pipeline network information; resolving the time that a negative pressure wave signal generated by a leak propagates to each disposed RTUs to form a data column; and simulating a leak situation, detecting a pipeline pressure waveform by using the RTUs in a current network, and determining a point corresponding to the data column closest to a measured propagation time delay in the time delay standard library as a leak point, and outputting the position of the leak point.

The light irradiation device includes a light source supporter having a tubular shape is closed on a side of one end, a plurality of light-emitting elements placed on an outer wall surface of the light source supporter, a tubular body extending inside the light source supporter in an axial direction of the light source supporter, a first flow channel formed between the tubular body and the light source supporter and having an annular shape when viewed from the axial direction; and a second flow channel formed inside the tubular body, wherein the first flow channel and the second flow channel communicate with each other on a side of one end of the light source supporter, and the tubular body contains a material having a thermal conductivity lower than a thermal conductivity of a material constituting an outer wall of the first flow channel.

The light irradiation device includes a light source supporter having a tubular shape is closed on a side of one end, a plurality of light-emitting elements placed on an outer wall surface of the light source supporter, a tubular body extending inside the light source supporter in an axial direction of the light source supporter, a first flow channel formed between the tubular body and the light source supporter and having an annular shape when viewed from the axial direction; and a second flow channel formed inside the tubular body, wherein the first flow channel and the second flow channel communicate with each other on a side of one end of the light source supporter, and the tubular body contains a material having a thermal conductivity lower than a thermal conductivity of a material constituting an outer wall of the first flow channel.

A portable air flow meter fabricated using a 3D printer. A nozzle cover, a fixing cover, and a handle are formed integrally with a cylindrical housing in which a multi-nozzle for measuring an air flow is installed. The cylindrical housing is fabricated using a 3D printer. Fabrication costs are reduced, and a fabrication period is reduced. The portable air flow meter has superior portability due to light weight, and is effective in terms of usability.

A multiphase fluid is flowed from a flow pipe to a U-bend. Several differential pressures of the multiphase fluid flowing through the flow pipe and U-bend are measured. A total flow rate of the multiphase fluid is determined at least based on the measured differential pressures. In some cases, flow rates of each of the phases of the multiphase fluid can be determined at least based on the measured differential pressures.

A multiphase fluid is flowed from a flow pipe to a U-bend. Several differential pressures of the multiphase fluid flowing through the flow pipe and U-bend are measured. A mixture density of the multiphase fluid is determined at least based on the measured differential pressures. A total flow rate of the multiphase fluid is determined at least based on the measured differential pressures. In some cases, flow rates of each of the phases of the multiphase fluid can be determined at least based on the measured differential pressures.

A flow meter for intravenous liquids comprising a vertical inlet passage (2), a parallel indicating chamber (9), a U shaped flow-resistant liquid passage (6), and an exit chamber (11). Liquid to be dispensed enters the inlet passage (2) via inlet (5) and moves down the passage to a junction with both the U shaped flow-resistant passage (6), and the indicator passage. From the junction, the liquid rises up the indicator passage to a height proportional to the flow rate set by an external flow meter, and also through the flow resistant passage, which has an outlet (8) that delivers the liquid to the exit chamber (11) and from there to a patient through an outlet (12). The meter may be formed by an assembly of two injection molded components, thus reducing manufacturing costs.

A system and method for dividing a single mass flow into secondary flows of desired ratios to total flow. Each secondary flow line includes a pressure drop element, an absolute pressure sensor and a differential pressure sensor. The nonlinear relationship between flow and pressures can be transformed into a function of the absolute and differential pressures that has a linear relationship with the flow.