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Journal of Thermal Science

热科学学报

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2023 , Vol. 32 >Issue 3: 922 - 932

DOI: https://doi.org/10.1007/s11630-023-1709-y

Numerical Study of Heat Transfer Characteristic for Subcooled Falling Film outside the Shaped Tubes under Rolling Motion

  • HAN Hui ,
  • WANG Junqi ,
  • WANG Shaowei ,
  • LI Yuxing
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  • Provincial Key Laboratory of Oil and Gas Storage and Transportation Safety in Shandong Province, China University of Petroleum (Huadong), Qingdao 266580, China

网络出版日期: 2023-11-22

基金资助

The present work is supported by the National Natural Science Foundation of China (U21B2085, 52274068) and the Natural Science Foundation of Shandong Province of China (ZR2021ME128). 

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Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023
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Numerical Study of Heat Transfer Characteristic for Subcooled Falling Film outside the Shaped Tubes under Rolling Motion

  • HAN Hui ,
  • WANG Junqi ,
  • WANG Shaowei ,
  • LI Yuxing
Expand
  • Provincial Key Laboratory of Oil and Gas Storage and Transportation Safety in Shandong Province, China University of Petroleum (Huadong), Qingdao 266580, China

Online published: 2023-11-22

Supported by

The present work is supported by the National Natural Science Foundation of China (U21B2085, 52274068) and the Natural Science Foundation of Shandong Province of China (ZR2021ME128). 

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023
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摘要

用于浮式天然气液化的绕管式换热器，其换热性能可能受到海上晃荡的显著影响。本文结合动网格技术建立了管外降膜流动的三维数值模型，研究了静态和晃动条件下的过冷降膜流动传热特性。研究观测了壳侧液膜速度的三维分布，分析了换热管截面形状、雷诺数和晃动参数对换热特性的影响。研究发现，由于显著改善了下半管周的传热，蛋形管的传热性能在静态和晃动条件下均优于椭圆管和圆形管。晃荡运动使3种换热管的传热系数均降低；在横摇幅度为6°时，圆管、椭圆管和蛋形管的平均传热系数分别降低了2.1%、3.7%和4.9%。当前晃动参数下，增加横摇幅度对传热有利，而改变横摇周期对传热影响不大。蛋形管和椭圆管在低雷诺数时受晃动运动的影响较大，而在高雷诺数时受影响较小。

关键词： falling film flow; sloshing condition; spiral wound heat exchanger; floating liquefied natural gas

本文引用格式

HAN Hui , WANG Junqi , WANG Shaowei , LI Yuxing . Numerical Study of Heat Transfer Characteristic for Subcooled Falling Film outside the Shaped Tubes under Rolling Motion[J]. 热科学学报, 2023 , 32(3) : 922 -932 . DOI: 10.1007/s11630-023-1709-y

Abstract

The heat transfer performance of spiral wound heat exchanger used in the floating liquefied natural gas (FLNG) may be significantly affected by the sloshing conditions. In this paper, a three-dimensional numerical model combined with the dynamic mesh technology is conducted to study subcooled falling film heat transfer under static and sloshing conditions. The three-dimensional velocity distribution of the liquid film on the shell side is observed. The effects of cross-section shape of heat exchange tubes, Reynolds numbers and sloshing parameters on heat transfer characteristics are analyzed. The results indicate that the heat transfer performance of the egg-shaped tube is superior to that of the elliptical and circular tube under both static and sloshing conditions due to significant heat transfer improvement in the lower half of the tube. The heat transfer coefficients of three different kinds of tubes decrease under sloshing conditions. When the rolling amplitude is 6°, the average heat transfer coefficients of the circular tube, elliptical tube and egg-shaped tube are reduced by 2.1%, 3.7% and 4.9% respectively. Under the current sloshing parameters, increasing the rolling amplitude, the heat transfer coefficients of three different tubes are slightly increased, while the sloshing period has little effect on heat transfer. The egg-shaped tube and elliptical tube are greatly affected by sloshing motion at the low Reynolds number, while the effect is relatively small at the high Reynolds number.

Key words： falling film flow; sloshing condition; spiral wound heat exchanger; floating liquefied natural gas

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