Oscillatory flow rate measurement of ideal gases from a velocity at a point in a pipeline using micro flow sensor

摘要

Recently, a new mass flow meter for gases becomes commercially available which installed a newly developed micro flow sensor on the velocity boundary layer in the pipeline. As the response of the sensor is high, this sensor is expected to use also on the unsteady flow measurement. Although, the velocity profile of the unsteady flow is different from that of the steady flow, it is not sure that the unsteady flow can measure correctly. In this paper, the sinusoidal oscillatory flow is measured using the micro flow sensor from a velocity at a point in the pipeline with the calibrated results at the steady flow. The effect of the position of the sensor to the measurement is investigated on the laminar flow both theoretically and experimentally. Standard flow rates are generated by an unsteady flow generator which are proposed by us. It becomes clear that when the oscillatory flow rate is measured by the flow sensor on the proper position on the velocity boundary layer in the inlet region, the sinusoidal flow up to 10Hz could be measured using the calibrated result on the steady flow.