受限空间圆管表面结霜特性及换热性能实验研究

董晓俊 1; 丁培 1; 张蓓乐 2; 陈小砖 2; 赖天伟 1; 侯予 1

doi:10.7652/xjtuxb202002009

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受限空间圆管表面结霜特性及换热性能实验研究

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- 受限空间圆管表面结霜特性及换热性能实验研究
- Experimental Study on Frosting Characteristics and Heat Transfer Performance of Circular Tube Surface in a Confined Space
- 西安交通大学学报 2020年54卷第2期页码：71-77
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
  
  : 2019-08-03。作者简介: 董晓俊(1975—),男,博士生;侯予(通信作者),男,教授,博士生导师。基金项目: 陕西高校青年创新团队资助项目;中央高校基本科研业务费专项资金资助项目(ND6J005)
- DOI：10.7652/xjtuxb202002009
  中图分类号： TK124
- 网络首发：2020-02-10，
  
  纸质出版：2020
- 稿件说明：
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董晓俊 1, 丁培 1, 张蓓乐 2, 等. 受限空间圆管表面结霜特性及换热性能实验研究[J]. 西安交通大学学报, 2020,54(2):71-77.

Experimental Study on Frosting Characteristics and Heat Transfer Performance of Circular Tube Surface in a Confined Space[J]. 2020, 54(2): 71-77.
董晓俊 1, 丁培 1, 张蓓乐 2, 等. 受限空间圆管表面结霜特性及换热性能实验研究[J]. 西安交通大学学报, 2020,54(2):71-77. DOI： 10.7652/xjtuxb202002009.

Experimental Study on Frosting Characteristics and Heat Transfer Performance of Circular Tube Surface in a Confined Space[J]. 2020, 54(2): 71-77. DOI： 10.7652/xjtuxb202002009.

摘要

为了优化换热器结构以提高其除霜性能

通过水平圆管结霜可视化实验台对受限空间内结霜过程进行了实验研究

分析了霜层厚度沿管长方向的生长规律、结霜量和热流量随时间的变化规律

以及湿空气初始流速、温度、相对湿度和管壁温度等因素对圆管表面结霜量和热流量的影响。实验结果表明:结霜初期

霜层厚度沿管长方向逐渐升高; 之后

圆管中部的霜层最厚

靠近入口的霜层厚度最小; 融霜最先发生于空气流道出口处; 结霜量随时间延长呈现增长趋势

而热流量呈现先增大后减小的趋势; 较高的湿空气流速、湿空气温度、相对湿度和较低的壁面温度对应较大的结霜量和热流量

其中管壁温度对结霜量和热流量影响相对较小。实验所获得的结霜特性与换热规律对换热器设计具有一定的参考价值。

Abstract

An experimental study on the frosting process in a confined space through a hori-ontal tube frosting visuali-ation test bed is conducted to optimi-e the structure of the heat exchanger and improve its defrosting performance. The growth rule of frost layer thickness along the length of a tube

the variations of frost accumulation and heat transfer rate with time are evaluated. The influences of wet air initial flow rate

temperature

relative humidity and wall temperature on the frost accumulation and heat transfer rate on the surface of the tube are analy-ed. Experimental results show that the thickness of the frost layer gradually increases along the length of the tube at the beginning of frosting. Then

the frost layers are the thickest in the middle of the round tube

and the lowest near the inlet

respectively. Frosting begins at the outlet of the air flow passage. The frost accumulation shows an increasing trend with time passing

while the heat transfer rate increases first and t

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