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Acoustic-electric double-mode measurement method for velocity of gas-liquid two-phase bubbly flow

A bubbly flow, dual-mode technology, applied in fluid velocity measurement, velocity/acceleration/impact measurement, measurement device, etc., to achieve the effect of high speed, convenient measurement and low cost

Active Publication Date: 2017-08-08
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it has certain limitations when measuring the velocity of highly random fluids such as bubbly flow.

Method used

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  • Acoustic-electric double-mode measurement method for velocity of gas-liquid two-phase bubbly flow
  • Acoustic-electric double-mode measurement method for velocity of gas-liquid two-phase bubbly flow
  • Acoustic-electric double-mode measurement method for velocity of gas-liquid two-phase bubbly flow

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Embodiment Construction

[0024] The calculation method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] figure 1 It is a schematic diagram of the structure of the dual-crystal ultrasonic transducer in the measurement method of the present invention. The dual-crystal ultrasonic transducer used in the patent of the present invention includes a receiving piezoelectric ceramic chip 1a and a transmitting piezoelectric ceramic chip 1b, both of which are obliquely attached to acoustic coupling materials 2a and 2b cut into fixed geometric shapes. Between the two parts, a soundproof material 3 is placed to prevent mutual interference of sound waves. The inclination angle of chips 1a and 1b needs to ensure that the included angle between the normal direction of the plane where the chips are located and the incoming flow direction 0 is θ. A metal shell 4 is installed on the outermost side to protect the whole dual crystal transducer. The line i...

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Abstract

The invention relates to an acoustic-electric double-mode measurement method for the velocity of a gas-liquid two-phase bubbly flow. An ultrasonic transducer containing a bi-piezoelectric ceramic wafer and a capacitance-conductance sensor are adopted. The method comprises the following steps: acquiring the moisture content H; measuring the average real velocity of bubbles in a space; calculating the drag force between a continuous liquid phase and a disperse gas phase; calculating the shearing force of the pipe wall on the continuous liquid phase; getting the real velocity of the liquid phase through a numerical iterative algorithm; calculating the apparent velocity of the liquid phase and the apparent velocity of the gas phase; and calculating the total apparent velocity of a gas-liquid bubbly flow according to the definition of total apparent velocity of a two-phase flow.

Description

technical field [0001] The invention belongs to the technical field of fluid measurement, and relates to a measurement method combining an ultrasonic sensor and an electrical sensor, which is used for non-disturbance measurement of gas-liquid two-phase bubbly flow split-phase flow velocity. [0002] technical background [0003] Two-phase flow widely exists in daily life and industrial production processes, such as food processing, bioengineering, chemical industry, metallurgical industry and petroleum industry, and its main manifestations include gas-liquid two-phase flow, liquid-liquid two-phase flow, liquid-solid flow Two-phase flow and gas-solid two-phase flow. Compared with single-phase flow, the flow state of two-phase flow is more complicated, so the online process parameter detection of two-phase flow has always been the focus of scientific research and industrial circles. The measurement of water content and flow rate (flow rate) of gas-liquid two-phase flow is of g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/24G01N27/22
CPCG01N27/223G01P5/241
Inventor 谭超董虓霄董峰
Owner TIANJIN UNIV
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