高Pr数流体在肋叉排三维内肋管中传输特性实验研究
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摘要
本文以未使用过的润滑油为工质,用正交试验设计方法,对高Pr数流体在肋叉排列三维内肋管中的传热和流阻特性进行了实验研究。研究范围Re= 30~1000;Pr=600~4000 。
    研究结果提供了高Pr数流体在肋叉排三维内肋管中的流态判据。结果表明:在低雷诺数下,肋叉排列三维内肋管内的流型就由层流向过渡流转变,其转换雷诺数(下临界雷诺数Recr)与肋形结构相关:Recr=3.3602(H/Di)-2.380 (Pt/H)-1.646 (B/Pt)-1.352 (S/B)-3.097。可见,Recr随肋高H、肋宽B、肋轴向间距Pt的增大而减小;同样,流型由过渡流向旺盛湍流转变时的上临界雷诺数Reb也与肋形结构相关:Reb=52.51 (H/Di)-0.956(Pt/H)-0.777(B/Pt)-0.455(S/B)-0.783。Reb随肋高H、肋轴向间距Pt的增大而减小,随肋宽的增大而增大。
    由于高Pr数流体在肋叉排三维内肋管中的临界雷诺数较低,工程设计时容易实现使流型处在换热系数较高的湍流区。说明肋叉排列三维内肋管是强化高Pr数流体传热的优良管件。
    对实验所得数据用最小二乘法进行了多元线性回归。分别求取得到了层流﹑过渡流和旺盛湍流三种流态下的换热和流阻准则方程式。
    用正交试验设计分析方法对试验结果进行了分析。得到了肋叉排列三维内肋管在以上三个流态区间内,达到热力性能系数最佳时的结构组合方式,并对强化传热的机理进行了理论分析。同时,指出了肋形结构进一步优化的方向。
    本文所得结论可作为后续研究的参考和进行工程应用的设计依据。
This paper carry out experimental study of the heat transfer and flow resistance characteristics of high Prandtl number fluid in 3-D internally crossing -finned tubes with cross-experiment design method.use oil as work media. Where Reynolds number ranged from 30 to 1000,Prandtl number from 600 to 4000.
     One of the results is the criterion of flow state in the 3-D internally crossing -finned tube. It shows that the flow in 3-D internally finned tubes can transform from laminar to transitive state with lower Reynolds number ,the conversional Reynolds number (under critical Reynolds number)Recr is correlated with the structures of the fin . Recr=3.3602(H/Di)-2.380 (Pt/H)-1.646 (B/Pt)-1.352 (S/B)-3.097which descends when H,B or Pt adds.Samely the conversional Reynolds number which show the flow transform from transitive state to turbulent state (up critical Renolds number) Reb is correlated with the structures of the fin too. Reb = 52.51(H / Di)-0.956 (Pt/H)-0.777 (B/Pt)-0.455 (S/B)-0.783 , which descends when H or Pt adds , oppositively when B reduces.
     The critical Reynolds number is small in the 3-D internally crossing -finned tube. Which is helpful for the engineering design to make the fluid flow in the turbulent zone and improve the heat transfer co-efficient .It shows that the 3-D internally crossing -finned tube is the superior tube for the high Prandtl fluid to enhance heat transfer.
    Regressed the experimental date with linear use minimal dual multiply method.Got the empirical equation of heat transfer and flow resistance in laminar,transitive and turbulent zone.
    Analysised the cross-experimental results and found the fittest way of various constructs to get the highest value of the thermal performance factor .Gave the theorith analysis of the mechanism of enhancement of heat transfer.And point out the optimize way of the fin.
    The conclusion of this paper offered the reference for latter study and engineering design.
引文
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