Experimental device and method for accurately measuring core characteristic parameters of wall activation

A feature parameter, accurate measurement technology, applied in the field of refinement, can solve problems such as poor measurement accuracy, and achieve the effect of avoiding huge deviation and good scalability.

Active Publication Date: 2021-08-17
NUCLEAR POWER INSTITUTE OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of poor measurement accuracy of the existing activation core characteristic parameters, the present invention provides an experimental device for accurately measuring the wall surface activation core characteristic parameters

Method used

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  • Experimental device and method for accurately measuring core characteristic parameters of wall activation
  • Experimental device and method for accurately measuring core characteristic parameters of wall activation
  • Experimental device and method for accurately measuring core characteristic parameters of wall activation

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Experimental program
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Embodiment 1

[0039] This embodiment proposes an experimental device for accurately measuring the characteristic parameters of the core of the wall surface activation. Using micro-nano processing technology, nucleated regions with different characteristic sizes are precisely processed on the same characteristic surface, and the characteristic size of the wall surface of each nucleated region is accurate. Controllable, supplemented by visualization technology, effectively avoids the huge deviation caused by the roughness characterizing the radius of the vaporization core, so as to accurately measure the characteristic parameters of the wall activation core.

[0040] Specific as figure 1 As shown, the experimental device of this embodiment is composed of an experimental section, a copper block and an electric heating rod; the experimental section is arranged on the upper end surface (upper surface) of the copper block, and the electric heating rod is arranged on the lower end surface (lower su...

Embodiment 2

[0047] This embodiment proposes an experimental method based on the experimental device proposed in the above-mentioned embodiment, specifically as Figure 4 As shown, the method includes the following steps:

[0048] Step S1, Copper Block Uniformity Design Check Calculation

[0049] Use the CFD method to calculate the upper surface temperature of the copper block with electric heating rods. At the maximum power level, the difference between the maximum and minimum temperature of the copper block upper surface does not exceed 0.5°C, which is qualified.

[0050] Step S2, precalculation of the feature size of the kernelized region

[0051] Before the precise measurement of the activated core feature size, the feature size needs to be pre-calculated, and the pre-calculation method can be used:

[0052]

[0053] In the formula, σ is the surface tension, v fg is the difference between the vapor-liquid two-phase volume, r c is the core feature size, p f is the liquid phase p...

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Abstract

The invention discloses an experimental device and method for accurately measuring core characteristic parameters of wall activation. The experimental device is composed of an experimental section, a copper block and a heating rod. The experiment section is arranged on the upper surface of the copper block, the heating rod is arranged on the lower surface of the copper block, and the experiment section is heated in a mode that the copper block and the heating rod are combined; and a plurality of coring areas with different feature sizes are arranged on the experiment section. According to the device and method, coring areas with different characteristic sizes are accurately processed on the same characteristic surface, so that huge deviation caused by the fact that the roughness represents the radius of the vaporization core is effectively avoided, the characteristic size of the wall surface activation core is accurately measured, and the device and method have important significance on development of the correlation direction of boiling heat transfer and two-phase flow.

Description

technical field [0001] The invention belongs to the field of refinement technology, and in particular relates to an experimental device and method for accurately measuring the core characteristic parameters of wall surface activation. Background technique [0002] Boiling, as an important form of heat and mass transfer, widely exists in many heat exchange systems. During the boiling process, the cooling working medium changes from liquid to gaseous state. Accompanied by the phase change, the huge latent heat of phase change makes the heat transfer coefficient of boiling much larger than single convective heat transfer and heat conduction under the same conditions. Therefore, using boiling to realize heat and mass transfer is one of the important heat transfer methods. With the development of science and technology, the demand for mechanism exploration has further increased, and computational fluid dynamics has gradually developed from single-phase heat transfer calculations...

Claims

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Application Information

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IPC IPC(8): G01B21/00G01N25/20
CPCG01B21/00G01N25/20Y02E30/30
Inventor 闫晓王云昝元峰都宇
Owner NUCLEAR POWER INSTITUTE OF CHINA
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