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首页> 外文会议>The 2001 ASME International Mechanical Engineering Congress and Exposition, 2001, Nov 11-16, 2001, New York, New York >PRESSURE EFFECTS ON THE BUOYANCY-INDUCED CONVECTIVE HEAT TRANSFER FOR NON-BOUSSINESQ FLUID IN A RECTANGULAR ENCLOSURE
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PRESSURE EFFECTS ON THE BUOYANCY-INDUCED CONVECTIVE HEAT TRANSFER FOR NON-BOUSSINESQ FLUID IN A RECTANGULAR ENCLOSURE

机译：矩形壳体中非Boussinesq流体对浮力引起的对流换热的压力效应

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摘要

Numerical predictions of pressure effects on natural convective heat transfer characteristics for a non-Boussinesq fluid in a rectangular enclosure are presented. The solution method is developed based on a compressible flow model and is employed to simultaneously determine the absolute pressure, density, temperature, and velocity distributions in the enclosure. Discretization equations are derived from the integral mass, momentum, and energy equations on a staggered grid. The fluid pressure in the enclosure is varied from 20 to 300 kPa such that the flow behavior in a vacuum or pressurized system can be observed. Physical situations investigated also include cases in a wide range of wall temperature difference associated with various length scales, corresponding to an equivalent modified Rayleigh number ranging from 10~4 to 10~6. The validity of the incompressible flow model coupled with the Boussinesq approximation for the fluid density, which is commonly used in the existing studies of the buoyant flows, is discussed.
机译：给出了矩形罩中非Boussinesq流体压力对自然对流换热特性影响的数值预测。该解决方法是基于可压缩流模型开发的，可用于同时确定外壳中的绝对压力，密度，温度和速度分布。离散方程式是从交错网格上的积分质量，动量和能量方程式导出的。外壳中的流体压力在20到300 kPa之间变化，因此可以观察到真空或加压系统中的流动行为。调查的物理情况还包括与各种长度尺度相关的大范围壁温差的情况，对应的等效修正瑞利数范围为10〜4到10〜6。讨论了不可压缩流模型与流体密度的Boussinesq逼近相结合的有效性，该模型通常用于现有的浮力流研究。

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