摘要
针对堆积的颗粒常存在空穴的现象,构建了含空穴的椭球形颗粒堆稳态传热模型,研究了颗粒导热系数对含空穴椭球形颗粒堆传热特性的影响。研究结果表明:随着颗粒导热系数的增加,颗粒堆的平均热流密度增加,表观热阻减小;随着颗粒导热系数的增加,空穴对颗粒堆传热性能的影响程度增加,平均热流密度相对变化率和表观热阻相对变化率增加;随着颗粒导热系数的增加,空穴影响颗粒堆传热的区域面积越大,随着导热系数由0.5 W/(m·K)增至50 W/(m·K),空穴影响区域比由1.599%增至6.058%。
Considering that vacancies often exist in accumulated particles,a steady-state heat transfer model of a vacancy-containing ellipsoidal particle heap was constructed to study the effects of the thermal conductivity of the particles on the primary heat transfer performance of the ellipsoidal particles containing vacancy.The results show the following three rules.Firstly,as the thermal conductivity of the particles increases,the average heat flux of the particle heap increases and the apparent thermal resistance decreases.Secondly,as the thermal conductivity of the particles increases,the degree of influence of vacancy on the particle heap increases,and the relative rate of change in average heat flux and the relative rate of change in apparent thermal resistance increase.Thirdly,the area of influence by vacancy on the interior of the particle heap is distributed in a ring shape,which increases with the increase of thermal conductivity.For instance,as the thermal conductivity increases from 0.5 W/(m·K)to 50 W/(m·K),the vacancy affected area ratio increases from 1.599%to 6.058%.
作者
刘泽砚
徐纪国
郑斌
王有镗
孙鹏
孟建
刘永启
LIU Ze-yan;XU Ji-guo;ZHENG Bin;WANG You-tang;SUN Peng;MENG Jian;LIU Yong-qi(School of Transportation and Vehicle Engineering,Shandong University of Technology,Zibo 255049,China)
出处
《广西大学学报(自然科学版)》
CAS
北大核心
2021年第2期405-413,共9页
Journal of Guangxi University(Natural Science Edition)
基金
国家重点研发计划重点专项(2017YFB0603504-2)
国家自然科学基金资助项目(51806130)
山东自然科学基金资助项目(ZR2020ME176,ZR2020ME182)。
关键词
导热系数
空穴
椭球形颗粒
传热
空穴影响区域比
thermal conductivity
vacancy
ellipsoidal particles
heat transfer
the vacancy affected area ratio