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Theoretical Study on Optimum Tube Arrangement in Shell and Tube Heat Exchanger

管壳式换热器优化管排列的理论研究

基本信息

批准号：
62550159
负责人：
FUJII Motoo
金额：
$ 0.96万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62550159/
关键词：
Shell and Tube Heat Exchanger Tube Bank Numerical Analyses Pressure Coefficient Heat Transfer Coefficient Turbulent Flow 高粘性流体圧力降下

项目摘要

This project was carried out to clarify the flow and heat transfer characteristic in tube banks, and to obtain expressions for the heat transfer coefficients and pressure coefficients which may be used for the design of shell and tube heat exchanger. Two-dimensional Navier-Stokes and energy equations were solved numerically. in the calculations, temperature dependent viscosity is considered and k- two-equation model is applied for turbulent flow regime.The main conclusions of this study and the problems to be solved are as follows:(1) For laminar flow regime, the effects of tube arrangements and heating conditions of tubes (uniform wall temperature or uniform wall heat flux) on pressure and local heat transfer coefficients are clarified quantitatively.(2) Temperature dependent viscosity has large effects on flow and heat transfer characteristics and a reference temperature to estimate viscosity should be determined to obtain dimensionless correlation expressions for these characteristics.(3) The usual k- two-equation model of turbulence may be applied for flow in tube bank, however, it is very difficult to obtain the accrate results. the convergence and the heat balance become much poorer than laminar flow.(4) To improve the accracy of numerical solution and to obtain dimensionless expressions for pressure and heat transfer coefficients are remained to be solved in near future.

本课题旨在研究管束内的流动和传热特性，并得到可用于管壳式换热器设计的传热系数和压力系数的表达式。数值求解了二维Navier-Stokes方程和能量方程。计算中考虑了粘性随温度的变化，湍流区采用k-两方程模型，主要结论和有待解决的问题如下：（1）对于层流区，定量地阐明了管的布置方式和加热条件（均匀壁温或均匀壁面热流）对压力和局部换热系数的影响。(2)粘度随温度的变化对流动和传热特性有很大影响，为了得到这些特性的无量纲关联式，需要确定一个估算粘度的参考温度。(3)通常的k-双方程湍流模型可以用来描述管束内的流动，但很难得到准确的结果。会聚和热平衡变得比层流差得多。(4)提高数值解的精度，获得压力和传热系数的无量纲表达式，是今后有待解决的问题。