Numerical simulation on flow and thermal performance of water-in-glass evacuated elliptical tube solar collector

ZHANG Changmi; TAO Hanzhong; LI Tong; JIANG Chuan

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Numerical simulation on flow and thermal performance of water-in-glass evacuated elliptical tube solar collector

Thermal Power Generation Issue 10, (2017)

更新时间：2025-09-28

- Numerical simulation on flow and thermal performance of water-in-glass evacuated elliptical tube solar collector
- 作者机构：
  
  1. 南京工业大学能源科学与工程学院,江苏,南京,211800
  2. 东南大学能源与环境学院,江苏,南京,210096
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK513
- Published Online：01 November 2017，
  
  Published：2017
- 稿件说明：
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ZHANG Changmi, TAO Hanzhong, LI Tong, et al. Numerical simulation on flow and thermal performance of water-in-glass evacuated elliptical tube solar collector[J]. Thermal Power Generation, 2017, (10).
DOI：

ZHANG Changmi, TAO Hanzhong, LI Tong, et al. Numerical simulation on flow and thermal performance of water-in-glass evacuated elliptical tube solar collector[J]. Thermal Power Generation, 2017, (10). DOI：

摘要

采用数值模拟的方法研究了三维非稳态椭圆形截面全玻璃真空管太阳能集热管内工质的流动特征和传热性能。通过分析努塞尔数Nu、管内流体自然对流瑞利数Ra、流体涡量?、流体轴向速度u、集热器的平均热效率???5个参数，比较截面短长轴比(分别为0.6、0.9、1.0的3种椭圆形截面全玻璃真空管太阳能集热器集热管内工质的三维非稳态流动特征和传热性能。结果表明：?、Nu、Ra随着短长轴比的增加而增加，短长轴比为1.0的圆形截面集热管比短长轴比为0.6的椭圆形截面集热管?、Nu、Ra高，因此圆形截面集热管传热性能和流动性能最好；集热管内存在涡旋，管箱连接处的涡旋强度最大，到集热管底部的涡旋强度越来越小，椭圆管内的涡旋强度大于圆管；集热管内的轴向速度呈余弦函数分布。

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