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首页> 外文会议>2002 ASME International Mechanical Engineering Congress and Exposition , Nov 17-22, 2002, New Orleans, Louisiana >EFFECT OF CYLINDER ASPECT RATIO AND CHANNEL DIMENSIONS ON THE FLUID FLOW AND HEAT TRANSFER IN PARALLEL-PLATE CHANNEL HEAT EXCHANGERS
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EFFECT OF CYLINDER ASPECT RATIO AND CHANNEL DIMENSIONS ON THE FLUID FLOW AND HEAT TRANSFER IN PARALLEL-PLATE CHANNEL HEAT EXCHANGERS

机译：圆柱纵横比和通道尺寸对平行板通道换热器中流体流动和传热的影响

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摘要

A comparative numerical study has been carried out to analyze the unsteady three-dimensional flow and heat transfer in a parallel-plate channel heat exchangers with in-line arrays of periodically mounted square cylinders (pins) at various Reynolds number and geometrical configurations. The geometry considered represents the narrow trailing edge region of the blade where pin fins are used to serve both a structural and a heat transfer role. The three-dimensional unsteady Navier-Stokes and energy equations are solved using higher order temporal and spatial discretizations. The simulations have been carried out for a range of Reynolds number based on cylinder width (180-600) and a Prandtl number of 6.99 (corresponding to water). Conjugate heat transfer calculations have been employed to account for the conduction in the solid cylinder and convection in the fluid. The thermal performance factor (TPF) increases significantly when the flow becomes unsteady. The choice of aspect ratio of the cylinders is judged by their relative increase in friction factor and heat transfer at transitional Reynolds number. The TPF is found to increase with the increase in pitch of the cylinders. The increase in channel height enhances the TPF though the heat transfer decreases at higher channel height.
机译：已经进行了比较数值研究，以分析在平行板通道换热器中的非定常三维流动和传热，该换热器具有以周期性排列的方筒（销）在不同雷诺数和几何构造下的直列阵列。所考虑的几何形状代表了叶片的狭窄后缘区域，在该区域中，销钉鳍片既起到结构作用，又起到传热作用。使用高阶时间和空间离散化方法解决了三维非稳态Navier-Stokes和能量方程。针对基于圆柱体宽度（180-600）的雷诺数范围和6.99（对应于水）的普朗特数进行了模拟。共轭传热计算已用于说明固体圆柱体中的传导和流体中的对流。当流量不稳定时，热性能系数（TPF）会显着增加。圆柱体长宽比的选择取决于它们在过渡雷诺数下的摩擦系数和传热的相对增加。发现TPF随着气缸间距的增加而增加。尽管在较高的通道高度处传热降低，但是通道高度的增加会提高TPF。

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