Effects of fin pitch on heat transfer and flow resistance of twisted-serrated spiral finned tube banks

WANG Xuegang; YUAN Yichao

doi:10.11949/j.issn.0438-1157.20151179

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Effects of fin pitch on heat transfer and flow resistance of twisted-serrated spiral finned tube banks

更新时间：2025-12-10

- Effects of fin pitch on heat transfer and flow resistance of twisted-serrated spiral finned tube banks
- CIESC Journal Issue 4, Pages: 1200-1206(2016)
- 作者机构：
  
  上海理工大学上海市动力工程多相流动与传热重点实验室,上海,200093
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20151179
  CLC： K223
- Online First：05 April 2016，
  
  Published：05 April 2016
- 稿件说明：
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WANG Xuegang, YUAN Yichao. Effects of fin pitch on heat transfer and flow resistance of twisted-serrated spiral finned tube banks[J]. CIESC Journal, 2016, (4): 1200-1206.
DOI：

WANG Xuegang, YUAN Yichao. Effects of fin pitch on heat transfer and flow resistance of twisted-serrated spiral finned tube banks[J]. CIESC Journal, 2016, (4): 1200-1206. DOI： 10.11949/j.issn.0438-1157.20151179.

摘要

为了提高平齿型翅片管的强化传热效果

通过改变其锯齿的扭转方向和偏折角度得到了折齿型螺旋翅片管。利用数值模拟和模化试验相结合的方法对基管外径分别为38 mm和51 mm的折齿型螺旋翅片管束进行研究

得到了翅片螺距对折齿型螺旋翅片管束的换热与阻力性能的影响规律和最优翅片螺距。结果表明:翅片螺距Pf在3.63~8.47 mm范围内

空气侧Nusselt数Nu随Pf增大呈先递增后递减的趋势;当Pf大于6.35 mm时

翅片螺距增大对Nu的影响相对已不明显;空气侧Euler数Eu随Pf增大而减小。对于基管外径分别为38 mm和51 mm的折齿型螺旋翅片管束

Pf为6.35 mm时其性能指标Nu·f -1/3均最大

因此Pf=6.35 mm是最优翅片螺距。

Abstract

In order to improve the heat transfer enhancement of serrated spiral-finned-tube

twisted-serrated spiral finned tube was fabricated by changing the deflection angle and the twisted direction of serration. Twisted-serrated spiral finned tube banks with the diameters of 38 mm and 51 mm were researched by numerical simulation combined with modeling experiments. The influence of fin pitch on heat transfer and resistance characteristics of twisted-serrated spiral finned tube was obtained. The results showed that Nu at air-side increased firstly and then decreased with the increase of fin pitch from 3.63—8.47 mm. The effects of fin pitch on Nu at air-side was weaker when the fin pitch was larger than 6.35 mm. Eu at air-side decreased with increasing fin pitch. For twisted-serrated spiral finned tube banks with the diameters of 38 mm and 51 mm

comprehensive performance index Nu·f-1/3 was the maximum when the fin pitch is 6.35 mm. Thus

Pf =6.35 mm was the optimum fin pitch within the range of 3.63—8.47 mm.

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