FORMING AN EQUIVALENT THERMAL BOUNDARY LAYER FOR FULLY-DEVELOPED LAMINAR TUBE FLOW AND ITS FIELD SYNERGY ANALYSIS
FORMING AN EQUIVALENT THERMAL BOUNDARY LAYER FOR FULLY-DEVELOPED LAMINAR TUBE FLOW AND ITS FIELD SYNERGY ANALYSIS
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发表时间：
2007
影响因子：
2.4
通讯作者：
L. Wei
中科院分区：
文献类型：
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作者：
L. Wei
对多孔介质部分填充管内充分展开流动的传热和流动特性进行了数值研究。利用场协同原理分析了强化换热的机理。结果表明：在充分发展的管流中，多孔介质的部分填充可以形成等效的热边界层；采用导热系数高、孔隙率高、填充比例合适的多孔材料填充管，可以增强传热，限制流动阻力的增加。与传统的边界强化不同，这种类型的传热强化根植于管道的核心区域。数值计算得到了较高的PEC值，最高可达6，表明该方法对设计高效低阻换热器是有效的。
The heat transfer and flow characters for fully developed flow in a tube partially filled with porous media were studied numerically.The mechanisms of enhancing heat transfer were also analyzed using the principle of field synergy.The results showed that an equivalent thermal boundary layer could be formed in the fully developed tube flow by partially filling with porous media.Filling tube with porous materials of high thermal conductivity,high porosity and proper filling ratio could enhance heat transfer and restrict flow resistance increment.Heat transfer enhancement of this type was rooted at the core region of the pipe,unlike the traditional boundary enhancement.High PEC value up to 6 is obtained numerically,which showed the method is effective to design high-efficiency and low-resistance heat exchangers.