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首页> 外文期刊>International Journal of Heat and Mass Transfer >FULLY DEVELOPED FORCED CONVECTION THROUGH TRAPEZOIDAL AND HEXAGONAL DUCTS
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FULLY DEVELOPED FORCED CONVECTION THROUGH TRAPEZOIDAL AND HEXAGONAL DUCTS

机译：通过梯形和六角形管道完全展开的强制对流

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摘要

Laminar, fully developed flow through single-and double-trapezoidal (or hexagonal) ducts is modeled using a finite-difference method. A coordinate transformation is employed to map the irregular flow cross-section onto a rectangular computational domain. Both Hl and T thermal boundary conditions are considered as they represent the fundamental limiting conditions in most practical applications. Solutions for velocity and temperature variations are obtained for a wide range of duct aspect ratios and with four different trapezoidal angles. The friction factor and Nusselt number results show a strong dependence on duct geometry (aspect ratio γ and trapezoidal angle θ).The variations of f Re,Nu_Hl,and N_uT with duct aspect ratio for each 0-valued duct are presented in the form of polynomials in γ.The equations describe the computed numerical values within ±2/100 for single-trapezoidal and within ±1.5/100 for hexagonal ducts and are of much importance to the design of compact heat exchangers.
机译：使用有限差分方法对通过单梯形和双梯形（或六角形）管道的层流充分展开的流动进行建模。采用坐标变换将不规则流动横截面映射到矩形计算域上。考虑到H1和T热边界条件，因为它们代表了大多数实际应用中的基本极限条件。对于宽范围的管道纵横比以及具有四个不同的梯形角，可以获得速度和温度变化的解决方案。摩擦系数和Nusselt数结果显示出对管道几何形状（纵横比γ和梯形角θ）的强烈依赖.f Re，Nu_Hl和N_uT随管道长宽比的变化以0值管道的形式表示为方程描述了单梯形在±2/100范围内和六角形管道在±1.5 / 100范围内的计算数值，这对于紧凑型热交换器的设计非常重要。

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