球突翅片的传热流动特性及等效热阻数值分析  

Numerical Analysis of Equivalent Thermal Resistance and Heat Transfer Flow Characteristics of Dimpled Fin

作　　者：吴学红[1] 崔帅[1] 苟秋平[1] 吕彦力[1] 朱兴旺[1] 

机构地区：[1]郑州轻工业学院机电工程学院,河南郑州450002

出　　处：《工业加热》2012年第1期43-47,共5页Industrial Heating

基　　金：国家自然科学基金资助项目(21076200);河南省省院合作项目(092106000013);河南省科技攻关项目(102102210138);郑州市科技创新团队项目(10CXTD151);河南省教育厅项目(2011A470014)

摘　　要：为了提高翅片管换热器的传热系数和减小压降,提出了一种球突型翅片,通过数值模拟研究其传热与流动性能,同时应用(火积)耗散理论对其传热的不可逆性进行分析。计算结果表明:与平片相比,其传热能提高26.21%～39.53%,而阻力系数仅提高16.62%～27.04%,同时综合性能增加16.54%～32.56%;这说明该翅片具有高传热系数低压降的特点,是一种性能优良的翅片。通过(火积)耗散分析可以看出:球突翅片的等效热阻减小,其传热的不可逆性减弱。Low pressure drop and high heat transfer coefficient are the mainly goals for any new fin shape design.The dimpled fin was presented,Numerical study investigation was applied to investigate the characteristic of air flow and heat transfer.In the meantime,the irreversibility of the convective heat transfer was analyzed based on the entransy dissipation concept.The computational results show the Nusselt numbers of dimpled fin is 26.21%39.53% higher than that of plain fin,while friction factors of dimpled fin is 16.62%27.04% higher than that of plain fin,in the meantime overall performance of dimpled fin is 16.54%32.56% higher than that of plain fin;these indicate the dimpled fin has excellent performance and the characteristic of high heat transfer and low pressure drop.By analysis of entransy dissipation can be seen that the equivalent thermal resistance in the dimple fins is less.Therefore,the irreversibility of heat transfer in the dimple fins decreased.

关 键 词：球突翅片 流动与传热 (火积)耗散 等效热阻 

分 类 号：TK172[动力工程及工程热物理—热能工程]