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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
09 Jun 2003
TL;DR: In this paper, a venturi-assisted flow meter arrangement is disclosed, where the venturi is positioned in a pipe or conduit containing the fluid mixture to be measured upstream of the flow meter.
Abstract: A venturi-assisted flow meter arrangement is disclosed. The venturi is positioned in a pipe or conduit containing the fluid mixture to be measured upstream of the flow meter. The flow meter is preferably a flow rate meter and/or a phase fraction meter. When the fluid mixture is passed through the venturi, it is homogenized or mixed, which can increase the accuracy of the measurements made by the downstream flow meter. Additionally, the venturi can be used to compute the flow momentum of the fluid mixture, which may be used to calibrate or double check the operation of the flow meter, or allow it to compute the phase fraction for a three phase mixture.

74 citations

Patent
12 Mar 2010
TL;DR: In this article, the authors proposed a mass flow meter that can flexibly cope with a change of a sample fluid such as a gas kind without requiring a special troublesome labor and that can measure a flow rate with high accuracy.
Abstract: An object of this invention is to provide a superior mass flow meter or the like that can flexibly cope with a change of a sample fluid such as a gas kind without requiring a special troublesome labor and that can measure a flow rate with high accuracy. The mass flow meter comprises a sensor section that detects a flow rate of a sample fluid flowing in a flow channel, a setting section that sets a flow rate characteristic function that is intrinsic to each fluid to determine a flow rate based on a flow rate detected value output by the sensor section and an instrumental error correction parameter that is independent from the flow rate characteristic function and common to multiple sample fluids to correct an instrumental error of each mass flow meter, and a flow rate calculating section that calculates a flow rate measurement value of the sample fluid by applying the flow rate characteristic function and the instrumental error correction parameter to the flow rate detected value.

73 citations

Patent
30 Jul 1992
TL;DR: A Coriolis effect mass flow meter for measuring mass material flow in a conduit is presented in this paper, which is not dependent upon phase shift detection and is not susceptible to extraneous noise and does not require a complicated mounting.
Abstract: A Coriolis effect mass flow meter for measuring mass material flow in a conduit. The provided meter may be clamped directly onto an existing pipe or other conduit without diversion of the flow. The meter provides a driver (20), such as a magnetostrictive driver, to oscillate a section of pipe between two supports (12, 14). The driver (20) is mounted at or near an anti-node of the second harmonic mode of the natural frequency of the pipe section. A sensor (30) mounted adjacent the driver operates through a control circuit (Fig. 5) to control the frequency of oscillation of the pipe section. A second sensor (32), such as an accelerometer, is mounted at the node point of the second harmonic mode of the natural frequency of the pipe section during zero flow, (zero flow node point). The second sensor measures the amplitude of displacement of the zero flow node point due to the Coriolis effect forces from the mass of the material flowing through the oscillating pipe. This measurement is indicative of the mass flow rate of the material flowing through the pipe. The meter is not dependent upon phase shift detection and is not susceptible to extraneous noise and does not require a complicated mounting. In alternative embodiments, the meter is prefabricated on a section of pipe which can then be installed in a pipeline as an off the shelf item.

69 citations

Journal ArticleDOI
TL;DR: In this article, a calorimetric sensor for detection of gas velocity and flow direction was constructed by sacrificial porous silicon micromachining technique, which contains four temperature sensing resistors arranged symmetrically around a central filament heater.
Abstract: A calorimetric sensor for detection of gas velocity and flow direction was constructed by sacrificial porous silicon micromachining technique. The sensing element contains four temperature sensing resistors arranged symmetrically around a central filament heater. Finite volume flow simulations (FVM) for velocity vector and temperature distribution around the system elements led to the conclusion that the laminar flow conditions, essential for accurate calorimetric sensing, can be maintained by adequate selection of device dimensions and channel depth. Predictions by the flow and thermal simulations were aimed at defining the optimum geometric design. The results of functional tests performed on the fabricated structure were interpreted in terms of changes of parameters in the thermal equivalent circuit of the device.

68 citations

Patent
28 Jan 1987
TL;DR: In this paper, an iterative calculation makes it possible to obtain a density measurement corrected to allow for flow friction and individual flow rates of the two components, having regard to slippage therebetween.
Abstract: A gradiomanometer 1 measures the difference in pressure between points 3 and 4 to indicate density and hence proportions of two phases (e.g. liquid and gas), each of known density flowing as indicated by arrow 6. A venturi meter 2 measures the difference in pressure between points 4 and 5 to indicate flow rate, initially assumed to be that of the heavier phase only. An iterative calculation makes it possible to obtain a density measurement corrected to allow for flow friction and individual flow rates of the two components, having regard to slippage therebetween. A step discontinuity 8 may be provided downstream to create turbulence and render the flow homogenous.

68 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202312
202226
20212
20208
20194
201811