Effect of different geometries of bellows with/without insert on internal liquid nitrogen flow

ZHOU Shaohua; YAN Changdi; HUANG Yonghua

doi:10.11918/j.issn.0367-6234.201703097

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Effect of different geometries of bellows with/without insert on internal liquid nitrogen flow

更新时间：2026-10-19

- Effect of different geometries of bellows with/without insert on internal liquid nitrogen flow
- Vol. 50, Issue 1, Pages: 2018-1(2018)
- 作者机构：
  
  1. 上海交通大学制冷与低温工程研究所,上海,200240
  2. 上海市低温技术与测试应用服务平台,上海,200240
- 作者简介：
- 基金信息：
- DOI：10.11918/j.issn.0367-6234.201703097
  CLC： TB661
- Published：2018
- 稿件说明：
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ZHOU Shaohua, YAN Changdi, HUANG Yonghua. Effect of different geometries of bellows with/without insert on internal liquid nitrogen flow[J]. 2018, 50(1): 2018-1.
DOI：

ZHOU Shaohua, YAN Changdi, HUANG Yonghua. Effect of different geometries of bellows with/without insert on internal liquid nitrogen flow[J]. 2018, 50(1): 2018-1. DOI： 10.11918/j.issn.0367-6234.201703097.

摘要

为深入探讨更大结构尺寸范围内波纹管的液氮流动阻力特性，以量纲一的波高内径比和波距波高比为变量，通过建立波纹管内液氮流动的CFD仿真模型，考察较宽范围内波高内径比、波距波高比以及管内是否插入内芯情况下，达西摩擦因子在不同雷诺数下的变化规律，并与实验数据进行对比验证.结果表明：波纹管内流体进入波节形成漩涡是导致波纹管阻力增大的主要原因；当波高内径比和波距波高比不变时，仅改变波纹管的内径对达西摩擦因子几乎没有影响；内芯波纹管的内芯直径越大，达西摩擦因子越小；而内芯直径越小，其达西摩擦因子越接近空心波纹管.仿真结果与实验数据吻合良好.

Abstract

To further discover the flow resistance characteristics of liquid nitrogen in bellows in wider application range

dimensionless variables namely the ratio of wave-height over bellows-diameter (e/d) and the ratio of wave-pitch over wave-height (p/e) are introduced. CFD modeling has been conducted on the behaviors of both pressure drop and Darcy friction factor (f) at different geometries of the bellows

either with or without an insert. Effects on the f by different Reynolds numbers at certain ratios e/d or p/e in wide ranges were investigated. The results shows that the vortex forming inside the bellows trough is the main cause of the flow resistance increment. When the e/d and p/e remain unchanged

changing of the inner diameter of the bellows has little influence on the friction factor. If a rod is inserted into the bellows

the larger the rod diameter

the smaller the Darcy friction factor. When the diameter of the insert reduces to zero

the friction factor approaches that of the hollow bellows

which is consistent with the experimental results.

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