Topic
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.
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Patent•
20 Jun 1991TL;DR: In this paper, a method for measuring the mass flow rate of liquid flow exiting a two phase (gas/liquid) feed nozzle was proposed, which includes determining the Power Spectral Density from the output of an accelerometer in close proximity to the restriction orifice controlling the gas flow.
Abstract: A method for measuring the mass flow rate of liquid flow exiting a two phase (gas/liquid) feed nozzle. The method includes determining the Power Spectral Density from the output of an accelerometer in close proximity to the restriction orifice controlling the gas flow, or determining the Power Spectral Density from the output of a pressure transducer in contact with the gas flow on the down stream side of the restriction orifice. The liquid flow can then be obtained from a predetermined correlation between the RMS Vibrational Signal and the mass or liquid flow rate.
34 citations
Patent•
29 Aug 2003TL;DR: In this article, the mass flow rate of two-wire transmitters is determined from the corrected pressure reading and a measured volumetric flow rate using a table containing error values based on a standard density determination.
Abstract: Two-wire transmitters are described in which the required voltage that a control room must supply to the transmitter is lower at high current than at low current, thus freeing up more voltage for other uses, and in which a constant set of operating voltages may be maintained. A corrected pressure in a vortex flow meter may be determined that reflects the mass flow rate. Thus, the mass flow rate may be determined based on the corrected pressure reading and a measured volumetric flow rate. Density may be determined from pressure and temperature using a table containing error values based on a standard density determination and a relatively simple approximation. During operation of a flow meter, the stored error values may be linearly interpolated and the approximation may be computed to determine the density from the stored error value.
34 citations
TL;DR: In this paper, a flow visualization of a 6-port microchannel tube with a hydraulic diameter of 1.5 mm under adiabatic conditions was performed using R134a, a medium pressure refrigerant.
Abstract: Results are presented from a flow visualization investigation of a multiport microchannel tube using R134a, a medium pressure refrigerant. The study covers mass fluxes from 50-300 kg/s.m 2 and qualities ranging from 10-90%, with a 6-port microchannel tube with a hydraulic diameter of 1.5 mm under adiabatic conditions. The results from the flow visualization studies indicate that several flow configurations may exist in multiport microchannel tubes at the same time while constant mass flux and quality flow conditions are maintained. Based on these observations, development of a typical flow regime map does not appear to be an appropriate manner for describing the flow field if the flow conditions for each port are not known. Flow mapping of the fluid regimes in this multiport microchannel is accomplished by developing functions that describe the fraction of time or the probability that the fluid exists in an observed flow configuration. An application of the alternative method of flow description for press...
34 citations
TL;DR: In this article, a new flow conditioner is described which represents a new concept in flow conditioning and is demonstrated as being effective in meeting the flow requirements of ISO 5167 on both swirl magnitude and flow quality within a relative short development length.
34 citations
Patent•
24 Apr 1980TL;DR: A quantity of flow meter as mentioned in this paper includes two electrical conductors which are traversed by current and are physically traversed through a flowing medium to measure the amount of flow produced by the medium and the increase of current required for maintenance of the temperature difference between the two conductors.
Abstract: A quantity of flow meter, includes two electrical conductors which are traversed by current and are physically traversed by a flowing medium to be measured. The increase of the current required for maintenance of the temperature difference between the two conductors is evaluated as a measurement of the quantity of flow. The meter is particularly versatile and can be employed for a wide voltage range and includes resistors as the electrical conductors which are thin resistor layers applied upon a thin carrier.
34 citations