摘要
工业过程中存在大量的含非球形颗粒的多相流动,研究这类颗粒与流体的相互作用有重要的应用价值。本文选择底面为方形、形状随边长和高度规律变化的长方体颗粒,采用单颗粒沉降法测量了曳力系数,研究了形状变化、材料密度和沉降液黏度的影响。发现曳力系数在整个颗粒Re_p数范围(0.05～6300)内均高于球形颗粒,特别是采用阿基米德数Ar与Re_p数可揭示出所有数据的内在规律,提出了适用于这类长方体颗粒所有形状的统一曳力模型。
The interaction between non-spherical particles and fluid is very important for many industrial processes.This study investigates the drag of single particle of cuboid with square bases with regular changed shapes experimentally.The influence of particle shape and density and fluid parameters is analyzed.The drag coefficients of cuboids are higher than that of spheres for Re_p from 0.05 to 6300.Based on the inherent law of all the data with Ar and Re_p,a general and accurate drag model for these different shape particles is proposed.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2010年第4期625-628,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金重点项目(No.10632070)
