HEAT TRANSFER ENHANCEMENT OF A CYLINDER IN CROSS PULSATING LAMINAR FLOW

LI Guoneng; ZHENG Youqu; HU Guilin Zhejiang University of Science and Technology

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HEAT TRANSFER ENHANCEMENT OF A CYLINDER IN CROSS PULSATING LAMINAR FLOW

Thermal Power Generation Vol. 41, Issue 9, Pages: 19-23(2012)

更新时间：2025-09-28

- HEAT TRANSFER ENHANCEMENT OF A CYLINDER IN CROSS PULSATING LAMINAR FLOW
- 作者机构：
  
  浙江科技学院新能源与节能技术研究所
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK124
- Published：2012
- 稿件说明：
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LI Guoneng, ZHENG Youqu, HU Guilin Zhejiang University of Science and Technology. HEAT TRANSFER ENHANCEMENT OF A CYLINDER IN CROSS PULSATING LAMINAR FLOW[J]. Thermal Power Generation, 2012, 41(9): 19-23.
DOI：

LI Guoneng, ZHENG Youqu, HU Guilin Zhejiang University of Science and Technology. HEAT TRANSFER ENHANCEMENT OF A CYLINDER IN CROSS PULSATING LAMINAR FLOW[J]. Thermal Power Generation, 2012, 41(9): 19-23. DOI：

摘要

为研究脉动气流横掠等热流密度圆柱体的换热特性

进行了层流中雷诺数Re为85～426的脉动气流横掠高温共烧陶瓷发热管的换热试验研究。结果表明

在脉动气流的脉动频率f=30Hz、脉动振幅prms=283Pa条件下

脉动气流能大幅度提高等热流密度圆柱体的换热性能

层流中脉动流横掠等热流密度圆柱体时

圆柱体表面的温度平均值为稳定流条件下温度平均值的88.7%;脉动流中圆柱体背风面后端点与迎风面前端点的温差仅为稳定流条件下温差的16.7%;脉动流强化换热因子的区间为1.78～1.98

平均值为1.88

随雷诺数的增加而线性地降低。

Abstract

In order to investigate the heat transfer properties of a constant heat flux cylinder in cross pulsating flows

an experimental setup was established.The heat transfer characteristics of a high temperature co-fire ceramic(HTCC) heating tube in pulsating flows with different Reynolds numbers(Re=85~426) were explored.Pulsating frequency and RMS amplitude of the pulsating flow was 30 Hz and 283 Pa separately.Results show that

the temperature level of the cylinder surface in pulsating flows is only 88.7% of that in steady flows(in average)

indicating that the pulsating flow has the capacity to increase the heat transfer coefficient significantly.On the other hand

the temperature difference between lee back point and upwind front point is only 16.7% of that in steady flows

revealing that the pulsating flow is able to decrease the temperature difference around the cylinder surface.Furthermore

results show that the pulsating flow enhances the heat transfer of the constant heat flux cylinder

and in this work

the heat transfer enhancement factor ranges from 1.78 to 1.98(1.88 in average).It decreases slightly and linearly with the increase of Reynolds number.

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