Energy analysis of spray flash evaporation from superheated upward jets

作     者：Cai, Benan Wang, Qingqing Yin, Songtao Gu, Hongfang Wang, Haijun Zhen, Hongdong Zhang, Lei 

作者机构：Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China China Nucl Power Design Co Ltd Shenzhen 518000 Peoples R China 

出 版 物：《APPLIED THERMAL ENGINEERING》 (实用热力工程)

年 卷 期：2019年第148卷

页      面：704-713页

核心收录：

学科分类：0820[工学-石油与天然气工程] 080702[工学-热能工程] 08[工学] 0807[工学-动力工程及工程热物理] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：National Natural Science Foundation of China 

主　　题：Upward flash evaporation Temperature gradient Energy utilization efficiency Spray flash speed 

摘      要：Flash evaporation is widely used in desalination technologies. The flash evaporation from upward and downward jets shows different characteristics. To study the upward flash evaporation, a model based upon droplet analysis is developed. The present model takes the droplet motion, droplet size variation and droplet temperature into consideration. The model is validated against the corresponding experimental results from previous literature and the calculated results from the model coincide with the experimental results. The dimensionless temperature profiles of the upward and downward flash evaporation are compared. Employing this model, the influences of the injection pressure, evaporation chamber pressure and flow velocity on the energy utilization efficiency and spray flash speed are investigated. The critical time and critical distance are also compared and analyzed.