Numerical study on flow and heat transfer characteristics of seawater-ice crystals two - phase flow in heat exchanger of polar ship

  • XU Li ,
  • HUANG Chang-xu ,
  • HUANG Zhen-fei ,
  • ZOU Xiang-yan ,
  • SUN Qiang
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  • (Key Laboratory of High Performance Ship Technology (Wuhan University of Technology),Ministry of Education,Wuhan 430063,China;School of Energy and Power Engineering,Wuhan University of Technology,Wuhan 430063,China)

Received date: 2017-09-15

  Revised date: 2017-11-16

  Online published: 2017-11-16

Abstract

In order to improve the heat transfer in heat exchanger of polar ship during it sails in the Arctic and to solve the ice blockage in the pipelines so as to ensure the operation and control of the seawater cooling system of the ship, based on the CFD numerical simulation method, the flow and heat transfer characteristics of seawater-ice crystals in entrance straight pipe of shell-and-tube heat exchanger were numerically simulated by using Eulerian-Eulerian two-fluid model coupled with the interphase heat and mass transfer model. The influences of inlet ice packing factor (IPF) and velocity on the flow and heat transfer characteristics of ice crystals were investigated. Results show that ice crystals are stratified due to melting during flow process, and when the inlet IPF increases or the velocity reduces, the more significant stratification occurs and the volume fraction of ice crystals near the top of the wall increases. In addition, compared with the heat transfer characteristics of singlephase seawater, when the velocity is 1.0 m/s, the ice crystals will enhance heat transfer and when the velocity is 1.5 m/s and the IPF is less than 6% or the velocity is 2.0 m/s and the IPF is less than 10%, the ice crystals have a weakening effect on the heat transfer of the seawater-ice crystals two-phase flow, and this effect enhances with the increase of the inlet velocity. When the IPF is 20%, the heat transfer coefficient reaches its maximum value.

Cite this article

XU Li , HUANG Chang-xu , HUANG Zhen-fei , ZOU Xiang-yan , SUN Qiang . Numerical study on flow and heat transfer characteristics of seawater-ice crystals two - phase flow in heat exchanger of polar ship[J]. Journal of Dalian Maritime University, 2018 , 44(2) : 81 -86+130 . DOI: 10.16411/j.cnki.issn1006-7736.2018.02.013

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