| 氨水竖管降膜蒸发实验和理论研究 |
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| 引用本文： | 卜宪标,马伟斌,龚宇烈.氨水竖管降膜蒸发实验和理论研究[J].热能动力工程,2011,26(4). |
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| 作者姓名： | 卜宪标 马伟斌 龚宇烈 |
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| 作者单位： | 1. 中国科学院广州能源研究所,广东广州,510640
2. 中国科学院可再生能源与天然气水合物重点实验室,广东广州,510640 |
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| 基金项目： | 国家863计划基金资助项目(2007AA05Z442) |
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| 摘 要： | 为了增强氨水竖管降膜蒸发过程中的热质传递效果,建立了降膜蒸发过程的数学模型,基于有限容积法对模型进行了求解,并通过实验验证了模型的准确性,用数学模型计算了溶液的速度场、浓度场、膜厚和换热量,得出结论:降膜蒸发过程的入口段小于100 mm,在入口段,溶液的流速和膜厚都发生剧烈的变化;最佳的布膜厚度是由溶液进口流量决定的;单位管长氨气的蒸发量随管长由上而下逐渐减小,前3 m管长的蒸发量占整个蒸发量的80.64%。基于建立的数学模型,可以确定不同流量下的布膜器最佳布膜厚度和管道最佳长度,为降膜换热器的优化设计提供参考。
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| 关 键 词： | 竖管 降膜 地热发电 热质传递 kalina循环 |
Experimental and Theoretical Study of Ammonia Water Falling Film Evaporation in a Vertical Tube |
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| BU Xian-biao,MA Wei-bin,GONG Yu-lie.Experimental and Theoretical Study of Ammonia Water Falling Film Evaporation in a Vertical Tube[J].Journal of Engineering for Thermal Energy and Power,2011,26(4). |
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| Authors: | BU Xian-biao MA Wei-bin GONG Yu-lie |
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| Affiliation: | BU Xian-biao,MA Wei-bin,GONG Yu-lie(Chinese Academy of Sciences Key Laboratory on Renewable Energy Sources and Natural Gas Hydrates,Guangzhou Energy Source Research Institute,Chinese Academy of Sciences,Guangzhou,China,Post Code:510640) |
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| Abstract: | To enhance the heat mass transfer effectiveness during the ammonia water falling film evaporation in a vertical tube,established was a mathematical model for the falling film evaporation process and the finite volumetric method was based to seek solutions to the model in question.Finally,the correctness of the model was verified through a test and the speed field,concentration field,film thickness and heat exchange quantity of the liquid solution were calculated by using the model.The authors have arrived a... |
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| Keywords: | vertical tube falling film geothermal power generation heat mass transfer Kalina cycle |
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