制冷学报2017，Vol.38Issue(6)：20-26,7.DOI:10.3969/j.issn.0253-4339.2017.06.020
低雷诺数下溴化锂溶液降膜吸收热质传递的数值研究
Numerical Study on the Heat and Mass Transfer of LiBr/H2 O Falling Film Absorption with Low Reynolds Number
摘要
Abstract
LiBr/H2 O falling?film absorption is a common heat?and mass?transfer process in an absorption air?conditioning system. By ana?lyzing the coupled heat and mass transfer of the falling?film absorption process, two?dimensional physical and mathematical models of the falling?film absorption along a vertical wall were established. The model was solved using the Fluent computational?fluid?dynamics soft?ware. The interfacial temperature, the concentration profile across the falling film, and the average heat?and mass?transfer fluxes and coef?ficients were obtained. The effect of the Reynolds number on the heat and mass transfer of the falling film was investigated. The results show that, when the film Reynolds number is less than 150, the average interfacial temperature increases with the increasing Reynolds number;however, the rising trend of the average interfacial temperature is more and more gentle. The average mass?transfer coefficient in?creases with the increasing Reynolds number, while the average heat?transfer coefficient decreases. Simultaneously, with the increasing Reynolds number, the average heat?and mass?transfer fluxes first increase and then decrease. An optimal Reynolds number exists that leads to the maximum heat?and mass?transfer fluxes. The average heat?and mass?transfer fluxes reach their maximums, 7. 2 kW/m2 and 2. 9 × 10 -3 kg/(m2·s), respectively, when the Reynolds number is 50.关键词
传热传质/溴化锂溶液/降膜吸收/雷诺数Key words
heat and mass transfer/lithium bromide solution/falling film absorption/Reynolds number分类
通用工业技术引用本文复制引用
张联英,李杨,王远,杨肖虎,金立文,孟祥兆..低雷诺数下溴化锂溶液降膜吸收热质传递的数值研究[J].制冷学报,2017,38(6):20-26,7.基金项目
本文受陕西省自然科学基础研究计划(2017JZ016)项目资助. (The project was supported by the Natural Science Basic Research Plan in Shaanxi Province of China (No. 2017JZ016).) （2017JZ016）
