Experimental study on pressure drop for subcooled water flow boiling under high heat fluxes

Jianguo YAN; Pengcheng GUO; Jiaqi MA; Xingqi LUO; Qincheng BI

doi:10.11949/0438-1157.20190163

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Experimental study on pressure drop for subcooled water flow boiling under high heat fluxes

Fluid dynamics and transport phenomena | 更新时间：2020-06-24

- Experimental study on pressure drop for subcooled water flow boiling under high heat fluxes
- CIESC Journal Vol. 70, Issue 11, Pages: 4257-4267(2019)
- 作者机构：
  
  1.State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, Shaanxi，China
  2.State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi，China
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190163
  CLC： TK 124
- Received：27 February 2019，
  
  Revised：2019-08-13，
  
  Published：05 November 2019
- 稿件说明：
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颜建国, 郭鹏程, 马嘉琦, 罗兴锜, 毕勤成. 高热流条件下过冷沸腾流动阻力特性试验研究[J]. 化工学报, 2019, 70(11): 4257-4267

YAN Jianguo, GUO Pengcheng, MA Jiaqi, LUO Xingqi, BI Qincheng. Experimental study on pressure drop for subcooled water flow boiling under high heat fluxes[J]. CIESC Journal, 2019, 70(11): 4257-4267
颜建国, 郭鹏程, 马嘉琦, 罗兴锜, 毕勤成. 高热流条件下过冷沸腾流动阻力特性试验研究[J]. 化工学报, 2019, 70(11): 4257-4267 DOI： 10.11949/0438-1157.20190163.

YAN Jianguo, GUO Pengcheng, MA Jiaqi, LUO Xingqi, BI Qincheng. Experimental study on pressure drop for subcooled water flow boiling under high heat fluxes[J]. CIESC Journal, 2019, 70(11): 4257-4267 DOI： 10.11949/0438-1157.20190163.

摘要

过冷沸腾在高热流冷却场合得到了广泛的应用，如聚变堆偏滤器冷却、压水堆堆芯冷却。其中，过冷沸腾流动阻力是换热系统设计的关键内容之一。试验研究了高热流条件下竖直通道内水的过冷沸腾流动阻力特性，试验段为内径6 mm、长径比44.4的不锈钢圆管。试验参数范围：热通量7.5~12.5 MW/m

，质量流速6000~10000 kg/(m

∙s），系统压力3~5 MPa，进口流体温度80~200℃。分析了质量流速、热通量、压力、沸腾数、Jacob数等参数对阻力的影响。结果显示，过冷沸腾流动阻力随着热流及质量流速的增加而增加，随压力增加而减小。将试验数据与文献中的经验关联式作对比，结果表明各关联式的预测误差较大，主要归结于拟合参数及工作流体的差异。研究发现管径尺寸效应也是影响阻力的一个因素，为此在前期成果的基础上，提出了一个添加管径因素修正项的经验关联式，该关联式的预测误差在±18%范围内。

Abstract

Subcooled boiling has been widely used in high heat flow cooling applications

such as fusion reactor divertor cooling and pressurized water reactor core cooling. In this paper

the pressure drop characteristics of subcooled water flowing in a vertical stainless circular tube are experimentally investigated under high heat fluxes condition. The test tube has an inner diameter of 6 mm and a length-to-diameter of 44.4. The operating parameters are as follows: heat flux

= 7.5—12.5 MW/m

mass flux

= 6000—10000 kg/(m

∙s)

pressure

= 3—5 MPa

and inlet fluid temperature

= 80—200℃. The effects of mass flux

heat flux

pressure

boiling number and Jacob number on subcooling boiling pressure drop were discussed. The results show that subcooled boiling pressure drop increases with increasing heat and mass fluxes but decreases with increasing pressure. The experimental data are compared with the available empirical correlations

and it is found that these correlations cannot well predict our data

which may be mainly due to the variations in operating parameters and working fluids. Moreover

it is observed that the subcooled boiling pressure drop is affected by diameter effect. Therefore

a new correlation is proposed based on our previous correlation

in which a correction term for diameter effect is added. The new correlation can capture the experimental data within ±18% error bands.

关键词

Keywords

references

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