FLUENT封闭腔体内自然对流的数值模拟
毕业论文关键词 自然对流 FLUENT数值模拟 二维封闭方腔 Ra瑞利数
Title Numerical Simulation of Natural Convection In Closed Cavity
Abstract Researches of Natural convection in closed cavity have great potentiality in nowadays engineering problems. For examples, insulation between buildings, security design in nuclear reactors, cooling down for micro electrical equipment, etc. Therefore, the problem of Natural convection in closed cavity becoming more and more important. Lots of researchers did plenty of experiments and numerical analysis. In different boundary conditions or different Ra number, there be different affects to Natural convection. This article use the 2-D model of closed cavity, analysis the different boundary conditions and Ra numbers, show the result of Natural convection, and also give the equation between Ra number and Nu number. Article starts from foundation of heat transfer and mass transfer, use the equation of heat and mass transfer to analysis the mathematical model of Natural convection, consider Ra number and give out the equation for natural convection. Article uses “FLUENT”, a commercial software, to help making numerical simulation, and shows the result of natural convection in a more specific way. Article builds several model including, different ratio of length and width, different boundary conditions, different Ra number, and use numerical simulation method to show the situation of temperature and velocity in Natural convection. And also get the graphic between Ra number and Nu number, in order to give out the equation between Ra number and Nu number.
Key words Natural convection FLUENT numerical simulation closed cavity Ra number
1 绪论1
1.1 计算传热、传质概述1
1.2 封闭腔体内自然对流问题及国内外研究状况1
1.3 数值计算方法2
1.4 FLUENT 软件介绍5
1.5 小结5
1.6 本文主要工作6
2 对流换热的理论分析7
2.1 导热概述7
2.2 对流换热理论8
2.3 自然对流换热10
2.4 小结12
3 不同长宽比对自然对流换热的影响13
3.1 FLUENT 模型的建立13
3.2 模型的参数设置及计算14
3.3 计算结果及分析16
3.4 小结20
4 不同边界条件对自然对流的影响21
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