基于泡沫金属的热管型发生器传热性能研究

发布时间：2018-06-09 05:16

本文选题：分离式发生器 + 泡沫金属　；参考：《河北科技大学》2016年硕士论文

【摘要】：以余热作为热源的热管型分离式发生器,以其节能环保的优点得到国内外学者的广泛关注。为了进一步增强传热,在热管中填充了泡沫金属。但是,泡沫金属的填充量对传热效率影响重大。所以,本文对基于泡沫金属的热管型发生器传热性能进行了研究。本文分别选取泡沫铜和水作为热管的填充材料和工质,以分离式热管型溴化锂发生器热管内填充的泡沫铜的长度和位置为究对象。首先,通过FUENT中设置热管出口水蒸汽温度和内部水蒸气的体积分数监视器得到二者的数据,当填充位置不变时,随着填充长度的增加,出口温度先减小后增大,气相率则先急剧增加然后减小,再增加的趋势,而当填充长度不变时,随着泡沫铜填充位置的上移,热管出口温度先增大然后减小,气相率先增加然后缓慢减小,再急剧增加;其次,通过理论推导并结合Origin软件拟合分别得到换热量与泡沫铜填充长度、填充位置的函数关系式,并通过MATLAB的黄金分割法确定上述两个公式的最优解;最后,将公式应用到冷凝段,利用FLUENT模拟其换热并与没有填充泡沫铜的对照组进行对比。本文研究结果表明从热管底部开始填充长度为334mm的泡沫铜时,其强化传热效果最佳,且公式应用于冷凝段所得换热性能明显优于对照组。本文的分析方法及结果,为基于泡沫金属的分离式热管型发生器的优化设计提供了重要参考依据。
[Abstract]:The heat pipe type separation generator with waste heat as heat source has been widely concerned by scholars at home and abroad for its advantages of energy saving and environmental protection. To further enhance heat transfer, the heat pipe is filled with foam metal. However, the amount of foam metal filling has a great influence on heat transfer efficiency. Therefore, the heat transfer performance of heat pipe generator based on foam metal is studied in this paper. In this paper, foam copper and water are selected as filling materials and working fluids of heat pipe, and the length and position of copper foam filled in heat pipe of separated heat pipe type lithium bromide generator are studied. First of all, the data of the heat pipe outlet water vapor temperature and the volume fraction of the internal water vapor are obtained by setting the heat pipe outlet steam temperature and the volume fraction of the internal water vapor in the heat pipe. When the filling position is constant, the outlet temperature decreases first and then increases with the increase of the filling length. When the filling length is constant, the exit temperature of heat pipe increases first and then decreases with the moving of the filling position of copper foam. The gas phase increases first and then decreases slowly, and then increases sharply. Secondly, through theoretical derivation and combining with Origin software fitting, the function relationship between heat transfer and filling length, filling position of copper foam is obtained, and the optimal solution of the above two formulas is determined by the golden section method of MATLAB. The formula was applied to the condensation section and the heat transfer was simulated by fluent and compared with the control group without copper foam. The results show that the heat transfer enhancement effect is the best when the foam copper with 334mm length is filled from the bottom of the heat pipe, and the heat transfer performance of the formula applied to the condensing section is obviously better than that of the control group. The analytical methods and results in this paper provide an important reference for the optimization design of separated heat pipe generator based on foam metal.
【学位授予单位】：河北科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TK172.4

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