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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
29 Sep 2000
TL;DR: In this paper, the corrected flow rate of a liquid falling into a predetermined class of liquids based on its viscosity and density is determined using a flow meter consisting of a flow sensor, a temperature sensor and a microprocessor.
Abstract: A flow meter and method for determining the corrected flow rate of a liquid falling into a predetermined class of liquids based on its viscosity and density is disclosed. The flow meter comprises a flow sensor for measuring an uncorrected flow rate of the liquid, a temperature sensor for measuring the temperature of the liquid, and a microprocessor for calculating the corrected flow rate based on the liquids predetermined class and the measured temperature. The flow sensor can include a restriction in the fluid flow path, first and second pressure sensors positioned one on each side of the restriction and a temperature sensor. The first and second pressure sensors measure the drop in fluid pressure created by the restriction and the temperature sensor measures the temperature of the liquid. By basing the corrected flow rate calculation on the predetermined class of the liquid, the calculation becomes a closed form solution that is deterministic providing for quick and accurate corrected flow rate calculation. A flow meter according to the present invention can be used in many applications such as, among others, liquid beverage dispensers and variable speed pumps.

26 citations

Patent
15 Aug 1985
TL;DR: In this paper, an immersion-type thermal fluid flow sensor is disclosed in which the temperature dependent sensing resistor means is carried from a flexible ribbon-shaped septum immersed in the flow and arranged in a spiral, meander or other geometrical configuration to partition the total flow passageway into a plurality of parallel flow portions.
Abstract: An immersion-type thermal fluid flow sensor is disclosed in which the temperature dependent sensing resistor means is carried from a flexible ribbon-shaped septum immersed in the flow and arranged in a spiral, meander or other geometrical configuration to partition the total flow passageway into a plurality of parallel flow portions. In one embodiment, the partitioned flow passageways are dimensioned to have a length to cross-sectional dimension ratio for providing laminar flow conditions over the operating flow range of interest. In another embodiment, a heater is provided for heating the septum to a temperature near that of the sensing resistor to reduce the time constant of the flow measurement. In another embodiment, a thermal loading element is coupled in heat exchanging relation with the sensing resistors for increasing the critical flow rate and thus for increasing the operating range of the flow regime wherein the temperature difference ΔT between the upstream and downstream resistors is a direct function of mass flow rate. Also, in another embodiment, thermal gradient shields shield the flow sensing resistors from external thermal gradients.

26 citations

Patent
16 Apr 1997
TL;DR: A fuel admission valve for metering gas without using a mass flow sensor is described in this article, where the valve uses a flow control element and nozzle, an actuator, a fuel supply pressure sensor, fuel supply temperature sensor, and a flow controller circuit to meter gas in sonic flow with insensitivity to the discharge pressure.
Abstract: A fuel admission valve for metering gas without using a mass flow sensor. The valve uses a flow control element and nozzle, an actuator, a fuel supply pressure sensor, a fuel supply temperature sensor, a flow control element position sensor, and a flow control circuit to meter gas in sonic flow with insensitivity to the discharge pressure.

26 citations

Patent
12 Nov 1993
TL;DR: In this paper, the authors measured the mass flow of a slurry mixture of two components of materials, such as a flow of catalyst solid particles (the first component) or droplets in a fluid carrier (the second component).
Abstract: Apparatus and process for measuring mass flow of a slurry mixture of two components of materials, such as a flow of catalyst solid particles (the first component) or droplets in a fluid carrier (the second component). The slurry mixture is added to a process stream (10) or batch reactor. The flow velocity and the volume fraction of one component are measured and combined with the known specific gravity, of the component being measured, and the physical dimensions of the pipe, in which the slurry mixture is flowing, to determine the mass flow of the component. The flow velocity is measured by correlating signals at two separated locations along the flow path, and the volume fraction is measured by combining the known dielectric constants of each of the materials in the mixture and the measured capacitance of the mixture. The capacitance is measured from electrodes which may be isolated from the flowing materials in some applications, but not isolated from the flowing materials in other applications. The temperature (9) and pressure (11) are compensated in the final calculation, and the mass flow result is used to control, via feedback, the amount of such materials delivered. Also, a subtraction technique to remove interfering power line noise is implemented to improve sensitivity.

26 citations

Journal ArticleDOI
TL;DR: The Coriolis effect-based flow meter as discussed by the authors can measure mass flow, density and temperature, and thus provide volumetric flow information as well, with one single transducer.
Abstract: Multivariable industrial transducers are becoming commonplace. The Coriolis effect-based flow meter measures mass flow, density and temperature, and thus provides volumetric flow information as well, with one single transducer. By using an additional simple device, the differential pressure transmitter, an additional process parameter, the fluid viscosity can be measured and used to monitor or control the process. The density signal makes it possible to perform measurements either in terms of absolute or kinematic viscosity units. The laws of physics limit the application of a tube viscometer to laminar flow of Newtonian fluids. Using various computing means and characterizations, a suitable physical layout and control, it is in addition possible to measure non-Newtonian fluids with the capillary viscometer. The paper discusses the use of direct mass flow meters which accomplish high precision density and viscosity measurements for a wide range of industrial processes.

26 citations


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