【摘要】 颗粒物质广泛地分布于地球上,是人们所熟悉的物质类型之一。大量颗粒组成的离散物质体系具有独特的性质和运动规律,是近十年来物理学研究中的一个活跃领域。文中以典型的颗粒物质:稻谷、玉米、大米为研究对象,将众多粮食颗粒堆积成的粮堆视作一种多孔介质体系,通过试验方法研究了此类颗粒物质在重力作用下,不同粮堆高度的通风阻力变化,结果显示出众多粮食颗粒组成的粮堆在低雷诺数下的流场阻力特性。文中还对在粮堆这个非固结颗粒体系中应用Darcy定律进行了参数修正,试验结果可以为CFD计算以及粮食储存过程中的降温、除湿等工程实践提供参考。更多还原

【Abstract】 Granular matter exists widely on the earth.A system consisting of a great amount of grains has unique behavior of characteristics.Granular matters play an important role in human’s life and in recent years they earned significant interests and continuous efforts in research from many scientists.In this article,having been seen as a system of porous media,corn,rice and paddy,the three types of popular granules’ drag properties have been investigated.The experimental results reveal the drag characteristic of them in low Reynold number flow(Re≈20~230).The data can be used in the ventilation industry for granary.更多还原