Experimental study on natural convective heat transfer with bottom curved heating surface in a rectangular enclosure

Jun YAO; Bin CHEN; Shouhua JIAO; Xiang CHAI; Yanhua YANG

doi:10.11889/j.0253-3219.2018.hjs.41.070601

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Experimental study on natural convective heat transfer with bottom curved heating surface in a rectangular enclosure

NUCLEAR ENERGY SCIENCE AND ENGINEERING | 更新时间：2021-05-19

- Experimental study on natural convective heat transfer with bottom curved heating surface in a rectangular enclosure
- NUCLEAR TECHNIQUES Vol. 41, Issue 7, Article number: 070601(2018)
- 作者机构：
  
  1.上海交通大学上海 200240
  2.中国核动力研究设计院成都 610213
- 作者简介：
- 基金信息：
  
  Science and Technology on Reactor System Design Technology Laboratory
- DOI：10.11889/j.0253-3219.2018.hjs.41.070601
  CLC： TK124
- Received：07 February 2018，
  
  Revised：20 April 2018，
  
  Published：10 July 2018
- 稿件说明：
移动端阅览
Jun YAO, Bin CHEN, Shouhua JIAO, et al. Experimental study on natural convective heat transfer with bottom curved heating surface in a rectangular enclosure[J]. Nuclear techniques, 2018, 41(7): 070601
DOI：

Jun YAO, Bin CHEN, Shouhua JIAO, et al. Experimental study on natural convective heat transfer with bottom curved heating surface in a rectangular enclosure[J]. Nuclear techniques, 2018, 41(7): 070601 DOI： 10.11889/j.0253-3219.2018.hjs.41.070601.

摘要

小型模块化反应堆的安全壳上封头被设计浸没在大量冷却剂中，在严重事故发生后，安全壳内的堆芯余热通过上封头外部的自然对流排出。为了研究安全壳上封头外部自然对流换热的二维特性，利用一个矩形封闭腔装置，在底部弧形面加热及常压条件下，开展了换热实验。同时利用粒子图像测速法（Particle Image Velocimetry，PIV）测量了弧形加热面周围的流场形态。研究发现：平均努塞尔特数（

）随加热功率而增大，但增长速率呈降低趋势；沿着弧形加热面向上，局部换热强度先减小后增大，在弧形面40°附近达到最低值；PIV测量结果展示了加热面周围流场形态；主流区的流动速度分层现象明显，且在

=50 mm前后的分层趋势相反，其主要源于横向速度的差异；最大流速与加热功率无关，功率主要影响主流区域的流动速度和其横向速度分量。

Abstract

Background

In the design of some small modular reactor (SMR)

the upper head of containment vessel is immersed in a large amount of coolant. After a severe accident

the residual heat inside containment vessel is then removed by natural convection above the upper head.

Purpose

This study aims to undertake research into the two-dimensional natural convective heat transfer above the upper head of containment vessel and the flow field around it.

Methods

A rectangular enclosure device with bottom curved heating surface was utilized to perform experiments under normal pressure. Particle image velocimetry (PIV) technique was employed to measure flow field.

Results

The average

number

local heat transfer intensity

velocity field due to curved heating surface were obtained and analyzed.

Conclusion

The average

number rises as heating power increases

while the growth rate has a descending trend. Along curved heating surface

local heat transfer intensity decreases first and then increases

lowest value of which occurs near 40° position of curved heating surface. Flow field around curved heating surface is visually revealed. Flow stratification becomes obvious near bulk flow

and the trend after

=50 mm is reverse. Stratification is mainly due to the horizontal component of velocity. The maximum velocity is irrelevant to heating power

whose major influence lies upon the velocity of bulk flow and its horizontal component.

关键词

Keywords

references

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