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A non-contact fluid film thickness measurement device and method

A fluid film and thickness measurement technology, applied in the research field of fluid measurement technology, can solve problems such as large measurement errors, interference, and destruction of fluid flow fields, and achieve good versatility and flexibility

Active Publication Date: 2021-11-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The direct method includes: Nosoko T et al. installed an electronic probe on a spiral micrometer to make the electronic probe contact with the liquid to obtain the film thickness, which is mainly used for the measurement of the peak height (Nosoko T, etal.Characteristics of two-dimensional waves on a falling liquid film[J].Chemical Engineering Science,1996,51(5):725-732.), this measurement method will disturb and destroy the fluid flow field, resulting in large errors in the measurement

Method used

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  • A non-contact fluid film thickness measurement device and method
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  • A non-contact fluid film thickness measurement device and method

Examples

Experimental program
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Effect test

Embodiment

[0049] A non-contact fluid film thickness measurement device, such as figure 1 As shown, it includes a liquid storage tank 1, a lift, an overflow weir 201, a liquid flow channel 202, a recovery box 3, an adjustable angle loading platform 4, and a LIF system 6;

[0050] The liquid storage tank is sequentially connected to a water pump 7, a flow meter 8, a valve 9, and an overflow weir 201 through a pumping pipeline;

[0051] The liquid storage tank 1 is connected to the liquid flow channel 202 through the U-shaped outlet on the side wall of the overflow weir, and the fluid flowing through the liquid flow channel 202 flows into the recovery tank 3 and then flows into the liquid storage tank 1 again; that is, the liquid storage tank 1 Used to provide and receive experimental fluids; figure 2 is a partial enlarged view of the measuring part of the measuring device; image 3 is the side view of the overflow weir structure; Figure 4 is the right view of the recycling bin struct...

Embodiment 2

[0059] A non-contact fluid film thickness measurement method, such as Figure 7 shown, including the following steps:

[0060] S1. Add the configured fluid containing a certain concentration of dyeing agent in the liquid storage tank 1. The fluid containing a certain concentration of dyeing agent is an aqueous rhodamine B solution with a concentration of 0.2g / L and a maximum absorption light intensity of 545nm. The maximum fluorescence intensity is 580nm;

[0061] Select the shooting angle of view above the liquid flow channel 202, and place the laser generator 603 of the LIF system 6 on the oblique top of the liquid flow channel 202 to be 90 degrees relative to the liquid flow channel 202; place the CCD camera 601 of the LIF system 6 The relative position above the liquid flow channel 202 and the liquid flow channel 202 is at an angle of 90°-α, and a long-pass filter is used;

[0062] S2. Take ten equidistant lines in the lateral direction of the inclined surface in the cal...

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Abstract

The invention discloses a non-contact fluid film thickness measuring device and a method for measuring the fluid film thickness using the device; the measuring device includes a liquid storage tank, a lift, an overflow weir, a liquid flow channel, a recovery box, and an adjustable angle Loading platform, LIF system; the liquid storage tank provides the required fluid, the fluid is transported to the overflow weir through the pump and pipeline, flows into the recovery tank through the liquid flow channel, and then flows into the liquid storage tank; the thickness of the fluid film is measured through the LIF system ; Add the prepared fluid containing a certain concentration of dyeing agent in the liquid storage tank, and the thickness of the film formed by the fluid in the flow can be three-dimensionally measured by the LIF system; the measuring device of the present invention can realize the measurement of the thickness of the fluid film The real-time non-contact three-dimensional measurement of the flow field can avoid destroying the flow state of the fluid during the flow process to maintain the spatial structure of the flow field and ensure the authenticity and reliability of the measurement results.

Description

technical field [0001] The invention relates to the research field of fluid measurement technology, in particular to a non-contact fluid film thickness measurement device and method. Background technique [0002] In the industrial field, liquid films are widely used in refrigeration, electronics, and energy fields due to their small thermal resistance and high heat flux, such as surface condensers, film cooling of circuits, and containment cooling liquid films. Accurate quantitative measurement of the thickness of the fluid film, including the observation of the formation process of the fluid film and the state of the flow process, helps to understand the hydrodynamic behavior of the fluid film, and can also be used as a basis to optimize the fluid film in specific industrial production Applications. Therefore, the measurement of fluid film thickness has attracted the attention of scholars at home and abroad. At present, the methods for measuring liquid films are mainly di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/06
CPCG01B11/06
Inventor 蔡杰进卓雄杰唐智洪王烨巩子琦
Owner SOUTH CHINA UNIV OF TECH
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