摘要颗粒材料在各种工业、研究场合均有广泛的应用。目前对于颗粒堆积材料在不同工 况下的热传导性能研究比较匮乏，没有较好的实验数据可供参考，也缺乏准确合理的理 论模型能够满足计算。因此，对颗粒材料进行深入分析，掌握固体颗粒间传热机理和传 热规律，对于提高相关工业过程的效率具有重要意义。本文基于一维稳态热传导原理， 设计了一套包含加热体、装粉容器、恒温换热系统三大部分的实验装置模型，通过验证， 该模型的测量精度为 2。52 % 。在现有实验台基础上，本文完成了玻璃微珠在三种不同堆 积厚度下的研究实验，测得玻璃微珠处于 50 ~ 70 oC 温度范围下的有效导热系数为 0。69W/（m·k），其固体材料石英玻璃的导热系数为 1。34 W/（m·k），表明堆积材料与固体材料 的导热性能差异较大，测量结果较为可靠。80197

毕业论文关键词 颗粒 堆积材料 热阻 稳态 热传导

毕 业 设 计 说 明 书 外 文 摘 要

Title The study of thermal contact resistance between particles

Abstract Granular materials are widely used in all kinds of industries and research fields。At present, for the accumulation of particulate material is relatively scarce in the study of the thermal conductivity of different conditions, no good experimental data for reference, but also a lack of accurate and reasonable theoretical model to meet the calculations。Therefore,In-depth analysis on the granular material,to master the mechanism and law of heat transfer between solid particles, is of great significance to improve the efficiency of the relevant industrial process。Based on the principle of one dimensional steady-state heat conduction theory,this paper designs a set of experimental device model ,which includes three parts, the heating body, the powder container and the constant temperature heat exchange system, the measurement precision of the model is verified at 2。52%。In this paper, through experiment under three different stacking thickness, the effective thermal conductivity of glass beads can be measured in 50 ~ 70 oC is 0。69 W/(m·k), while the thermal conductivity of the quartz glass is 1。34 W/(m·k),indicated that the heat transfer performance of packing material is very different from solid material,and the result is reliable。

Keywords Particles Packing materials Thermal resistance Steady-state Conduction

本科毕业设计说明书 第 Ⅰ 页

目 次

1 绪论 1

1。1 研究背景及意义 1

1。2 国内外研究现状 2

1。3 课题研究内容及方法 3

2 颗粒材料的热传导性能 5

2。1 粒径的影响 6

2。2 压紧条件的影响 6

2。3 温度的影响 7

2。4 本章小结