横向大剪切干涉应用于水平圆管自然对流换热

doi:10.3969/j.issn.0438-1157.2012.10.004

化工学报 ›› 2012, Vol. 63 ›› Issue (10): 3034-3039.DOI: 10.3969/j.issn.0438-1157.2012.10.004

横向大剪切干涉应用于水平圆管自然对流换热

朱进容¹, 吕伟², 周怀春²

1. 湖北工业大学理学院, 湖北武汉 430068;
2. 清华大学热能系热能动力仿真与控制研究所, 北京 100084

收稿日期:2012-02-08 修回日期:2012-03-26 出版日期:2012-10-05 发布日期:2012-10-05
通讯作者: 周怀春
作者简介:周怀春,朱进容(1978- ),女,博士研究生。
基金资助:
国家自然科学基金项目(50636010,51025622)。

Natural convection heat transfer of horizontal cylinder with lateral shearing interferometry

ZHU Jinrong¹, LV Wei², ZHOU Huaichun²

1. School of Science, Hubei University of Technology, Wuhan 430068, Hubei, China;
2. Institute of Simulation & Control for Thermal Power Systems, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China

Received:2012-02-08 Revised:2012-03-26 Online:2012-10-05 Published:2012-10-05
Supported by:
supported by the National Natural Science Foundation of China(50636010,51025622).

摘要/Abstract

摘要： 将横向大剪切干涉技术扩展到温度检测以及传热分析等应用场合中,得到了大空间自然对流水平圆管壁温从400℃降至13℃的整个过程的实时干涉条纹,然后根据一维无限长假设反演出相应的温度场,最终得到了多个壁温下沿圆周各个方向的温度梯度值,并拟合了Rayleigh数和Nu_ave之间的准则关系式。实验结果表明虽然壁面0°附近部分真实条纹可能被圆管竖直倾角引发的阴影遮挡而造成条纹级数检测值有轻微误差,但这不会对换热分析造成显著影响。与文献中主流准则关系式对比可知,利用横向大剪切干涉技术仅需简单的后处理即可得到具有很高的时间、空间分辨率的自然对流换热的可信数据。研究结果为今后热管换热器的理论研究和工程应用提供了参考。

关键词: 水平圆管, 自然对流, 换热, 横向剪切干涉, 剪切量

Abstract: The real-time interferometric fringes of natural convection around horizontal circular cylinder in infinite space with different wall temperatures from 400℃ to 13℃ were obtained based on lateral shearing interferometry with large shearing quantity,which was applied to temperature measurement and heat transfer analysis.The inversion of corresponding temperature fields was completed according to the assumption of one-dimensional infinite length.The temperature gradients along circumferential direction at different wall temperatures and the fitting criteria relationship between Rayleigh number and average Nusselt number were obtained.The experimental results show that the shadow caused by circular cylinder vertical obliquity results in a slight error in the detection of true fringe series near the wall at the angles close to 0°,but it does not have a significant impact on the heat transfer analysis.The comparison of mainstream criteria relationships obtained in this study and in literature shows that the data of natural convection heat transfer with high time and spatial resolution can be obtained via simple post-processing.Reference for future theoretical research and engineering applications of heat pipe is provided.

Key words: horizontal circular cylinder, natural convection, heat transfer, lateral shearing interferometry, shearing quantity

中图分类号:

TK311
TK124

朱进容, 吕伟, 周怀春. 横向大剪切干涉应用于水平圆管自然对流换热[J]. 化工学报, 2012, 63(10): 3034-3039.

ZHU Jinrong, LV Wei, ZHOU Huaichun. Natural convection heat transfer of horizontal cylinder with lateral shearing interferometry[J]. CIESC Journal, 2012, 63(10): 3034-3039.

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横向大剪切干涉应用于水平圆管自然对流换热

Natural convection heat transfer of horizontal cylinder with lateral shearing interferometry

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