摘要
基于欧拉方法,考虑温度对热物性的影响,耦合相间换热和界面浓度模型,模拟鼓泡塔内气体和熔融盐的换热行为。模拟分析熔融盐温升速率、体积换热系数和塔内熔融盐温度分布的规律,结果表明熔融盐温升速率和体积换热系数随表观气速的增加而增加,随初始液面高度的增加而减小,中心处熔融盐温度沿轴向高度增加逐渐减小,熔融盐温度径向分布随液位高度的增加逐渐趋于均匀。
In view of the low vapor pressure of molten salt being immiscible with the gas,direct-contact heat transfer of molten salt and gas is employed to effectively enhance the heat transfer rate and achieve full heat transfer. Based on the Euler method,consideringthe influence of temperature on thermophysical properties was considered,and interphase heat transfer model and interfacial concentration model were coupled,and the heat transfer behavior of gas and molten salt in the bubble column is simulated. The temperature rise rate,volumetric heat transfer coefficient,and distribution of temperature of molten salt were simulated and analyzed. The results show that the rate of temperature rise of molten salt and volumetric heat transfer coefficient increase with the increase of superficial gas velocity and decrease with the increase of initial liquid level. The temperature of molten salt in the center gradually decreases along with the increase of liquid level.The radial distribution of temperature of molten salt gradually tends to be uniform with the increase of liquid level.
作者
白爽
蒲文灏
杨宁
李晗
岳晨
张琦
Bai Shuang;Pu Wenhao;Yang Ning;Li Han;Yue Chen;Zhang Qi(College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;School of Energy and Mechanical Engineering,Nanjing Normal University,Nanjing 210042,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2020年第10期197-201,共5页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51606105)
中央高校基本科研业务费专项资金(NS2017012)
江苏省自然科学基金(BK20130905)。
关键词
熔融盐
换热
数值模拟
体积换热系数
界面浓度模型
molten salt
heat transfer
numerical simulation
volumetric heat transfer coefficient
interface concentration model
