Thermal mass flow meter

About: Thermal mass flow meter is a research topic. Over the lifetime, 1759 publications have been published within this topic receiving 21878 citations.

Coriolis-mass flow meter

Abstract: Shown and described is a mass flow meter for flowing media which operates according to the Coriolis principle, with a line inlet (1) leading to at least one the flowing medium Coriolis line (2), with a line outlet (3), with at least one of the Coriolis line acting, vibration generator, not shown, detected with at least one Coriolis forces and / or based on Coriolis forces Coriolis oscillations, Schwingungsmeswertaufnehmer not shown, and with a measuring device housing (5). According to the invention, a mass flow meter has been created, the "vibration-autonomous" is largely, namely the fact that a support system (4) with a carrying system's natural frequency that is substantially greater than the line resonant frequency and the Coriolis natural frequency, it is provided that the is the Coriolis line (2) to the support system (4) is connected, that the line inlet (1) and the line outlet (3) to the support system (4) are connected and that the measuring device resonant frequency is substantially smaller than the support system resonant frequency.

Low volume flow meter

Abstract: The low flow monitor provides a means for determining if a fluid flow meets a minimum threshold level of flow. The low flow monitor operates with a minimum of intrusion by the flow detection device into the flow. The electrical portion of the monitor is externally located with respect to the fluid stream which allows for repairs to the monitor without disrupting the flow. The electronics provide for the adjustment of the threshold level to meet the required conditions. The apparatus can be modified to provide an upper limit to the flow monitor by providing for a parallel electronic circuit which provides for a bracketing of the desired flow rate.

Method of calibrating an ultrasonic flow meter

Abstract: A method of calibrating an ultrasonic flow meter (10) first determines a static flow offset (52). Next, a dynamic flow offset (54) and a flow speed (56) are determined. An adjusted flow speed (58) is determined by subtracting the static flow offset and one half the dynamic flow offset from the flow speed to form an adjusted flow speed.

Effect of gas temperature on flow rate characteristics of an averaging pitot tube type flow meter

Abstract: The flow rate characteristics passing through an averaging Pitot tube (APT) while constantly controlling the flow temperature were studied through experiments and CFD simulations. At controlled temperatures of 25, 50, 75, and 100°C, the flow characteristics, in this case the upstream, downstream and static pressure at the APT flow meter probe, were measured as the flow rate was increased. The flow rate through the APT flow meter was represented using the H-parameter (hydraulic height) obtained by a combination of the differential pressure and the air density measured at the APT flow meter probe. Four types of H-parameters were defined depending on the specific combination. The flow rate and the upstream, downstream and static pressures measured at the APT flow meter while changing the H-parameters were simulated by means of CFD. The flow rate curves showed different features depending on which type of H-parameter was used. When using the constant air density value in a standard state to calculate the H-parameters, the flow rate increased linearly with the H-parameter and the slope of the flow rate curve according to the H-parameter increased as the controlled target air temperature was increased. When using different air density levels corresponding to each target air temperature to calculate the H-parameter, the slope of the flow rate curve according to the H-parameter was constant and the flow rate curve could be represented by a single line. The CFD simulation results were in good agreement with the experimental results. The CFD simulations were performed while increasing the air temperature to 1200 K. The CFD simulation results for high air temperatures were similar to those at the low temperature ranging from 25 to 100°C.