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中国电机工程学报 2008, 28(32) 66-71 DOI:
ISSN: 0258-8013 CN: 11-2107/TM |
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| 工程热物理 |
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管内核心流分层填充多孔介质的传热强化分析 |
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刘伟 明廷臻 |
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华中科技大学能源与动力工程学院 华中科技大学能源与动力工程学院 |
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摘要：
基于管内核心流强化传热的概念，在管内层流充分发展段的核心流内分层填充多孔介质，并建立流动与传热的数学模型。数值模拟结果表明：与光管相比，填充金属多孔介质后，管内核心流的温度更均匀，而边界流的温度梯度更大，全场平均协同角低于36o，壁面与流体之间的换热显著增强；此外，对于提出的两种型式的强化传热管，为提高其性能评价准则值，宜在速度较高的管内核心流内填充孔隙率相对较低，而在速度梯度较大的核心流内填充孔隙率相对较高的多孔材料。 |
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关键词：
管内核心流
强化传热
多孔介质
性能评价准则
协同角
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Analysis for Heat Transfer Enhancement in the Core Flow of a Tube Filled With Porous Media at different Layers |
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LIU Wei MING Ting-zhen |
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Abstract:
Based on the concept of heat transfer enhancement in the core flow, the core of the fully-developed laminar tube flow was filled with high-porosity metallic porous media divided into layers, and mathematical models to describe its flow and heat transfer characteristic were established. Numerical simulation results show that: Compared with those in clear tube, the temperature of the core flow in tube, which is filled with metallic porous media, is more uniform, the temperature gradient is larger in the boundary flow, and the average synergy angle of the whole tube is less than 36°, which shows that heat transfer between the wall and the flow is enhanced greatly. In addition, in order to increase the perfor- mance evaluation criteria value of the two types of enhanced tube, it is appropriate to fill the core flow where the velocity is large with relatively lower prosity metallic porous media, while the core flow where the velocity gradient is large need to be filled with relatively higher prosity metallic porous media. |
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Keywords:
core flow in tube
heat transfer enhancement
porous media
performance evaluation criteria
synergy angle
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收稿日期 2008-04-14 修回日期 1900-01-01 网络版发布日期 |
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DOI: |
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基金项目:
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通讯作者: 刘伟 |
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作者简介: |
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作者Email: w_liu@hust.edu.cn |
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| Copyright by 中国电机工程学报 |
