南通大学学报（自然科学版）2017，Vol.16Issue(4)：48-57,10.
氦气流过不同长度扭转平板的瞬态对流换热研究
Transient Heat Transfer for Helium Gas Flowing over a Twisted Plate of Different Length
王丽 1赵舟 2刘秋生 3福田勝哉3
作者信息
- 1. 南通大学机械工程学院,江苏南通226019
- 2. 中国一汽无锡油泵油嘴研究所,江苏无锡214063
- 3. 神户大学海事科学研究科,兵库神户6580022
- 折叠
摘要
Abstract
The behavior of heat transfer devices during transient processes with fast temperature changes may produce some undesirable results such as reduced thermal performance and thermal stress with eventual mechanical failure.In this research,forced convection transient heat transfer for helium gas flowing over a twisted plate with different length was experimentally and theoretically studied.The heat generation rate of the twisted plate was increased with a function of Q =Q0exp(t/τ)(where t is time,τ is period).The plates were twisted with the same helical pitch of 20 mm,and length of 26.8,67.8 and 106.4 mm (pitch numbers of 1,3 and 5),respectively.Based on the experimental data,it was found that the average heat transfer coefficient approaches the quasi-steady-state value when the dimensionless period τ* (τ* =ττU/L,U is flow velocity,and L is effective length) is larger than about 100 and it becomes higher when τ* is small.The heat transfer coefficient decreases with the increase of twisted plate length.Numerical simulation results were obtained for average surface temperature difference,heat flux and heat transfer coefficient of the twisted plates with different length and showed reasonable agreement with experimental data.Based on the numerical simulation,mechanism of local heat transfer coefficient distribution was clarified.关键词
瞬态换热/氦气/强制对流/扭转平板/长度效应Key words
transient heat transfer/helium gas/forced convection/twisted plate/length effect分类
能源科技引用本文复制引用
王丽,赵舟,刘秋生,福田勝哉..氦气流过不同长度扭转平板的瞬态对流换热研究[J].南通大学学报（自然科学版）,2017,16(4):48-57,10.
