化工学报2019，Vol.70Issue(z1)：69-78,10.DOI:10.11949/j.issn.0438⁃1157.20190033
基于扁管的蒸发式冷凝器管外传热传质特性研究
Study on heat and mass transfer characteristics outside flat tube for evaporative condensers
摘要
Abstract
Enhancement of the heat and mass transfer outside the tube of evaporative condensers can effectively reduce the energy consumption in a refrigeration system. The improving characteristics of heat and mass transfer outside a flat tube for evaporative condensers were investigated. Numerical simulation of the heat and mass transfer on the flat tube was carried out in Fluent using user define functions and component transport models. The heat transfer performance of a circular tube with the same perimeter was compared with that of the flat tube. The thickness and velocity of the liquid film outside the tube, the temperature distribution and the variation of moisture content outside the tube are studied, and the average heat transfer coefficients of the flat tube and the circular tube are compared. The results show that the average heat transfer coefficient of the flat tube is 9.04% higher than that of the circular tube. In addition, the influence of wind speed and spray density on the heat transfer of flat tube evaporative condenser is calculated. The wind speed varies from 1.5 m·s-1 to 3 m·s-1 and the spray density varies from 0.15 kg·m-1·s-1 to 0.3 kg·m-1·s-1. The results show that the average heat transfer coefficient increases by 5.68% and 30.26% respectively. Investigating the heat and mass transfer characteristics outside a flat tube for evaporative condensers provides theoretical guidance for the application of the flat tube in evaporative condensers.关键词
蒸发式冷凝器/扁管/蒸发/传热/传质Key words
evaporative condensers/ flat tube/ evaporation/ heat transfer/ mass transfer分类
能源科技引用本文复制引用
单思宇,谭宏博..基于扁管的蒸发式冷凝器管外传热传质特性研究[J].化工学报,2019,70(z1):69-78,10.基金项目
国家重点研发计划项目(2018YFB0904400) （2018YFB0904400）
