• 流动与传递 •

### 含竖直线热源松散颗粒物料的传热特性

1. 安徽省淮南市安徽理工大学机械工程学院 安徽省淮南市安徽理工大学机械工程学院 安徽省淮南市安徽理工大学机械工程学院 安徽省淮南市安徽理工大学机械工程学院 安徽省淮南市安徽理工大学机械工程学院 安徽省淮南市安徽理工大学.矿业工程博士后流动站
• 收稿日期:2015-05-11 修回日期:2015-07-06 出版日期:2015-10-20 发布日期:2015-10-20
• 通讯作者: 陈清华

### Research on Heat Transfer of Loose Particles under Vertical Direction Heat Source

CHEN Qing-hua PANG Li CHENG Gang DONG Chang-shuai WANMG Peng-yu LIU Ze-gong

1. College of Mechanical Engineering, Anhui University of Science and Technology College of Mechanical Engineering, Anhui University of Science and Technology College of Mechanical Engineering, Anhui University of Science and Technology College of Mechanical Engineering, Anhui University of Science and Technology College of Mechanical Engineering, Anhui University of Science and Technology Mining Engineering Postdoctoral Researchers Flow Station, Anhui University of Science and Technology
• Received:2015-05-11 Revised:2015-07-06 Online:2015-10-20 Published:2015-10-20
• Contact: CHEN Qing-hua

Abstract: Based on Brinkman-extended Darcy model, using pressure and velocity coupling SIMPLE under algorithm rectangular coordinate system, heat transfer characteristics of loose granular material under the vertical diraction heat source were simulated. The results showed that the granular material under the vertical line heat source had obvious convective heat exchange effect, and no obvious correlation with grain size and porosity. The average heat source surface Nusselt number, Nuavg, linearly increased with increasing of Ra, and the relationship between local heat source surface Nusselt number, NuR, and Ra was relatively complicated, but except the top of the heat source surface, the measuring positions could be described by NuR=aRa2+bRa+c. Thus, in order to reduce the effect of convective heat exchange, when the data of heat surface temperature were used to evaluate the thermal conductivity coefficient of sample (cross line method), the experimental time should not be more than 120 s. When the thermal physical parameters of sample were measured by parallel line method, the appropriate temperature measuring points should be located at its tube part positions (Y<0.33). the model prediction of temperature rise at typical measuring points was coincident with the measured results. But there was the maximum temperature deviation of 17℃ between the prediction of heat conduction model and measured results. The measuring point temperatures in the middle and low area had smaller deviation.