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Entrance and Temperature-Dependent Property Effects on Laminar Duct Flows of Liquids

机译：入口和温度特性对液体层流的影响

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摘要

The results of a numerical investigation on the effects of the temperature dependence of viscosity and thermal conductivity in simultaneously developing laminar flows of liquids in straight ducts of constant cross sections are used to obtain new correlations for the axial distributions of the peripherally averaged local Nusselt number. Three different cross-sectional geometries are considered, corresponding to both axisymmetric (circular and concentric annular) and three-dimensional (square) ducts. Uniform heat flux boundary conditions are specified at the heated walls. Viscosity is assumed to vary with temperature according to an exponential relation, while a linear dependence of thermal conductivity on temperature is assumed. The other fluid properties are held constant. A superposition method is applied to obtain the values of the peripherally averaged local Nusselt number by separately considering the effects of temperature-dependent viscosity and those of temperature-dependent thermal conductivity.
机译：对在恒定横截面的直管中同时展开的层流中的粘度和导热系数的温度依赖性影响进行数值研究的结果，用于获得外围平均局部Nusselt数的轴向分布的新关联。考虑了三种不同的横截面几何形状，分别对应于轴对称（圆形和同心环形）管道和三维（方形）管道。在加热壁上规定了均匀的热通量边界条件。假定粘度随温度根据指数关系变化，而假定导热系数与温度呈线性关系。其他流体属性保持不变。通过分别考虑温度依赖的粘度和温度依赖的导热系数的影响，采用叠加方法获得外围平均局部Nusselt值。

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  • 来源
    《Journal of Heat Transfer》 |2017年第3期|141-146|共6页
  • 作者

    Stefano Del Giudice; Stefano Savino; Carlo Nonino;

  • 作者单位

    Dipartimento Politecnico di Ingegneria e Architettura, Universita degli Studi di Udine, Via delle Scienze 206, Udine 33100, Italy;

    Dipartimento Politecnico di Ingegneria e Architettura, Universita degli Studi di Udine, Via delle Scienze 206, Udine 33100, Italy;

    Dipartimento Politecnico di Ingegneria e Architettura, Universita degli Studi di Udine, Via delle Scienze 206, Udine 33100, Italy;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    laminar forced convection; straight ducts; entrance region; temperature-dependent properties;

    机译：层流强迫对流直管;入口区域温度依赖性;

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