一、前言 在诸多的工程设备中,如肋片式换热器、太阳能集热器、核反应堆堆芯及电力电子器件,经常采用竖板通道作为其散热器件。自从Elenbass首次提出竖板通道自然对流问题后,人们对此作了大量分析和实验工作。为了便于分析,通常采用定物性假定(Boussinesqu假定),而很少注意物性的影响。当特性温差与绝对温度比不是很小的情况下,就要考虑流体物性变化的影响,通常用参考温度法或物性比法进行修正。本文着重研究物性变化对竖板通道内质量流量的影响。在数值计算和实验研究中,均发现了自然对流 I. INTRODUCTION In many engineering equipment, such as finned heat exchangers, solar collectors, nuclear reactors and power electronics, risers are often used as their heat sinks. Since Elenbass first proposed natural convection of risers, a great deal of analysis and experimentation has been done. In order to facilitate the analysis, usually the assumption of certainty (Boussinesqu assumption), and pay little attention to the impact of physical properties. When the characteristic temperature difference and the absolute temperature ratio is not very small, it is necessary to consider the impact of changes in fluid properties, usually using the reference temperature method or the physical property ratio method of correction. This article focuses on the influence of physical changes on the mass flow in the riser channel. In numerical calculation and experimental study, natural convection was found