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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01 Oct 2007
TL;DR: In this paper, a delay line device with two channels, namely a reference channel that does not come in contact with fluid and a sensing channel that makes contact with the fluid, is used to measure the mass flow rate of gases.
Abstract: The application of SAW devices to a thermometric mass flow rate meter with a reference channel for temperature compensation is presented. The sensor is composed of a delay line device with two channels, namely a reference channel that does not come in contact with the fluid and a sensing channel that makes contact with the fluid. The mass flow rate of gases can be obtained by measuring the temperature change of the device caused by drawing heat from the surface with constant temperature due to the fluid. The results obtained from flow rate measurements of several gases demonstrate that the proposed device is effective as a flow rate meter. Moreover, it is also shown that the response characteristics to mass flow rate changes and the response stability for fluids were improved by taking the phase difference between the signals of the reference channel and the sensing channel as the gas flow rate.
6 citations
Patent•
04 Jun 1979TL;DR: An ionization flow meter which can determine with high accuracy the flow of a gas expressed as a gas velocity, volume flow, or mass flow and substantially independently of pressure, temperature and, as the case may be, moisture content is presented in this paper.
Abstract: An ionization flow meter which can determine with high accuracy the flow of a gas expressed as a gas velocity, volume flow, or mass flow and substantially independently of pressure, temperature and, as the case may be, moisture content. By applying the theory of corona discharges, data relating to the flow-determining factors such as ion mobility and gas density can be derived from the known measured voltage and current values using electronic means. For example, the slope S of the I-V characteristic curve can be determined from the measured values of voltage V and current I.
6 citations
TL;DR: In this paper, a technique to measure the phase distribution in multiphase pipe flow was tested: by applying an external thermal excitation and measuring the temperature response at a variety of positions around the pipe the distribution of the phases can be distinguished due to their different thermal properties.
6 citations
TL;DR: In this article, visual observations and flow analyses made of annular liquid flow with cocurrent air flow in 2-and 4-inch-diameter horizontal transparent tubes are presented.
Abstract: Report presenting visual observations and flow analyses made of annular liquid flow with cocurrent air flow in 2- and 4-inch-diameter horizontal transparent tubes. The experiments occurred over a range of air mass velocities, air temperatures, and Reynolds numbers. Results regarding the velocity and thickness of liquid films, description of water-film disturbances, effect of flow variables on liquid-film characteristics, and relation between disturbances and flow conditions are provided.
5 citations
Patent•
20 Nov 2012
TL;DR: In this paper, a gas mixing device includes a main gas flow path, an additive gas flowpath, a mixing section, and a flow rate control unit, which includes a pilot type pressure regulating unit configured to regulate pressure of the main gas and a mass flow meter configured to detect the flow rate.
Abstract: This gas mixing device includes a main gas flow path, an additive gas flow path, a mixing section, and a flow rate control unit. A pilot type pressure regulating unit configured to regulate pressure of a main gas based on a pressure in the additive gas flow path and a mass flow meter configured to detect the flow rate of the main gas flow path are provided on the main gas flow path. An additive gas flow rate regulator configured to regulate a flow rate of an additive gas is provided on the additive gas flow path. The flow rate control unit controls the flow rate of the additive gas using the additive gas flow rate regulator based on a flow rate of the main gas detected by the mass flow meter.
5 citations