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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TL;DR: A formula has been derived which gives the collector current in terms of the ion density at the source position, ion transit distance, ion recombination coefficient, the pressure drop in the test section and the gas velocity, which can be used for design studies.
9 citations
Patent•
25 Nov 1970
TL;DR: A control system for the power supply in a mass flow meter, the flow meter having an ionizing electrode and an ion collecting electrode producing first and second currents, to maintain a constant ratio between the electrical potential across and the current flow between the ionizing source and the ion collector is presented in this article.
Abstract: A control system for the power supply in a mass flow meter, the flow meter having an ionizing electrode and an ion collecting electrode producing first and second currents, to maintain a constant ratio between the electrical potential across and the current flow between the ionizing source and the ion collector, so that the differential of the first and second collector currents is directly indicative of mass flow in the flow meter.
9 citations
Patent•
14 Dec 2009TL;DR: In this article, a method for operating a Coriolis mass flow rate meter with at least one measuring tube and at least two oscillation pickups is described. But this method is not suitable for the detection of deposits in the measuring tube.
Abstract: The invention relates to a method for operating a Coriolis mass flow rate meter (1) and a Coriolis mass flow rate meter with at least one measuring tube (2, 3), through which a medium flows and which is excited so as to perform oscillations, with at least two oscillation pickups (24, 25), which are spaced apart from one another in the longitudinal direction of the measuring tube, for generating in each case one oscillation signal (5, 6) and with an evaluation device (26). In order to detect deposits in the measuring tube, first of all a first indicator variable (II) is used which is based on the damping of the oscillations of the measuring tube. If, on the basis of the first indicator variable, increased damping is established, a second indicator variable (12) is then used, which is based on the manifestation of harmonics in the frequency spectrum of an oscillation signal. This has the advantage that reliable detection of deposits and therefore an indication of the state of meters and pipelines in a process engineering installation are possible.
9 citations
20 Apr 2008
TL;DR: A combined-application nanocalorimeter is developed at IMTEK in order to sense both flow and thermal properties of the flowing medium at the same time as mentioned in this paper, which is designed to measure flow velocity, direction, thermal conductivity of the fluid, and its specific heat by application of a sinusoidal heating.
Abstract: A combined-application nanocalorimeter is being developed at IMTEK in order to sense both flow and thermal properties of the flowing medium at the same time. It is designed to measure flow velocity, direction, thermal conductivity of the fluid, and its specific heat by application of a sinusoidal heating. In this report, we present the effects of design geometry and temperature sensor locations on accuracy and sensitivity, respectively. Flow measurement range and flow direction dependence of a 2D flow sensor are investigated via 3D FEM simulations. Based on the results of the simulations, the sensor will exhibit maximum sensitivity and a reduced error.
9 citations