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: In this article, a real-time correlation technique for measuring the average rate of flow of fluids through pipes is presented, where the only physical parameter required for the measurement principle is the well known distance between the sensors.
Abstract: The correlation technique presented offers a good possibility for measuring the average rate of flow of fluids through pipes. The only physical parameter required for the measurement principle is the well known distance between the sensors. The new system presented consists of ultrasonic sensors, transforming the natural, stochastic fluctuations of velocity, pressure and density into two signals with a delay time T, and a real-time correlator, extracting the delay time from the signals and calculating the average rate of flow of the fluid. In contrast to established flow measuring methods, no bluff bodies are necessary and electrical conductivity of the fluid is not required. In contrast to time-of-flight flow meters, a small amount of air bubbles or particles causes no signal losses and does not interrupt the measurement process. In this paper a detailed theoretical signal model describing the interaction of sound waves in random continuum and turbulent media will be presented. With this model the phase modulation of the ultrasonic waves and systematic errors can be described and some design parameters can be optimized. Measurements have been carried out with 40 and 50 mm pipe diameters for direct fluid contact and clamp-on transducers. The measurement error of the new flow meter has been found to be less than 2% from the reference value for a Reynolds number range 25 000-250 000 and, even down to a Reynolds number of 4000, it has been found to be less than 3%.
38 citations
TL;DR: In this paper, a rotary hydraulic flow control valve has been presented for high flow rate fluid power systems. But the proposed design enables utilisation of single-stage valves in power hydraulics operating at high flow rates regimes.
38 citations
Patent•
13 Jan 1998TL;DR: In this article, a method in a pressure transmitter and a pressure receiver for determining the mass flow rate of a fluid in a conduit is proposed, where the velocity is calculated by multiplying the square root of the differential pressure by a mass flow constant.
Abstract: A method in a pressure transmitter (144) and a pressure transmitter (144) for determining a mass flow rate of a fluid in a conduit (132) measure a differential pressure between two points (136, 138) in the fluid, where the conduit (132) has a substantially constant cross-sectional area between the two points. In one aspect, the mass flow rate is calculated by multiplying the square-root of the differential pressure by a mass flow constant.
37 citations
Patent•
16 Nov 1993
TL;DR: In this article, the relative flow rates of various components in a multiphase mixture were measured using a gas flow meter and a flow meter with a cut meter, and the system was extended with a horizontal flow line section.
Abstract: A system 100 for measuring the relative flow rates of various components in a multiphase mixture. The system includes an inlet 114 connected to a larger horizontal flow line section 118. Gas flows to a gas flow line 122 from the inlet and/or the horizontal section. Gas flow is measured in a gas flow meter 105 and liquid flow rate is measured in a flow meter 108. Optionally, two phase liquid flow is monitored with a cut meter 110.
37 citations
Patent•
28 Feb 1980TL;DR: In this article, a mass flow rate meter with two U-shaped tubular flow loops is presented, which can be used for varying the gain of the opto-electrical sensors to provide for a constant performance under conditions of changing temperature, voltage variations and aging characteristics.
Abstract: A mass flow rate meter is provided having two U-shaped tubular flow loops, means for vibrating the flow loops like the tines of a tuning fork Opto-electrical sensors on opposite legs of the flow loops generate signals indicative of the times between the passing of the sides of the loop through the static plane of the loop The times between the passing of the sides of the loops through the static plane may be combined to derive the mass flow rate of material flowing through the loops Means are provided for varying the gain of the opto-electrical sensors to provide for a constant performance under conditions of changing temperature, voltage variations and aging characteristics
37 citations