FLUENT6封闭系统内非牛顿流体换热特征研究
本文基于 FLUENT6.3 中自然对流及传热模型，主要通过改变非牛顿幂律流体的流变指数 n 值进行数值模拟计算，得到了其不同本构关系、长宽比和其他边界条件下流场的速度及温度分布，讨论了相关无量纲数之间的关系，通过对比分析了不同情况下非牛顿流体在封闭方腔内自然对流的流动现象，总结了各因素对其流动换热产生的影响，探究了其换热规律输运现象和换热特征。
关键词 封闭系统 幂律流体 二文模拟 换热特征 数值计算
Title Heat Transfer Characteristics of Non-Newtonian Fluid
in a Closed System
Abstract
The application value and significance of non-Newtonian fluid is
introduced and the flow and heat transfer characteristics of power law
fluid within a closed system is mainly studied in this paper. The influence
of the flow under different constitutive relations or boundary conditions
is systematically researched and the physical properties and heat transfer
phenomenon by computer simulation and numerical analysis is revealed.
This paper is based on FLUENT6.3 of natural convection and heat transfer
model, with the exploration and understanding of the basic constitutive
relations of non-Newtonian fluid, velocity and temperature distribution
under various kinds of constitutive relations and boundary conditions is
obtained. It also analyzed different situations of non-Newtonian fluid
transport phenomena and summarized the factors of influence on the heat
transfer characteristics by comparison. Thus, the flow and heat transfer
properties of non-Newtonian fluid is explored.
Keywords Closed system, Power law fluid, Two-dimensional simulation, Heat
transfer, Numeric calculation.
目 录
1 绪论 . 1
1.1 课题研究背景及其意义 . 1
1.2 国内外研究现状 . 1
1.3 非牛顿流体 . 2
1.4 封闭系统内非牛顿流体数值模拟方法的研究 . 4
1.5 本文的主要工作 . 5
2 Fluent算例验证及相关理论介绍 . 6
2.1 Fluent 软件介绍 . 6
2.2 对 Fluent 处理非牛顿流体的算例验证 . 6
2.3 对流换热理论 . 8
2.4 层流模型及数值方法 . 9
2.5 相关无量纲数 . 10
2.6 本章小结 . 11
3 不同本构关系对流动传热特征影响 12
3.1 非牛顿流体的选取及本构关系的改变 . 12
3.2 FLUENT模型的建立 . 12
3.3 非牛顿流体的参数设置及运算前处理 . 13
3.3 网格无关性验证 . 15
3.4 计算结果及分析 . 16
3.5 本章小结 . 21
4 不同边界条件对流动传热特征影响 23
4.1 不同长宽比对流动传热的影响 . 23
4.2 左右壁面不同边界温度差对流动传热的影响 . 25
4.3 下壁面有温度对流动传热的影响 . 27
4.4 本章小结 . 28
结 论 29
致 谢 30
参 考 文 献 31
1 绪论
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