摘要
针对分液冷凝换热器的毛细作用气液分离流动过程,建立了稳定流动情况下的一维数学模型.模型综合考虑了静压、重力、毛细压力、切应力的影响;考察了在稳定状态下孔径、孔数以及其组合方式对液膜高度的影响,同时还考察了入口干度和流量对液膜高度的影响;发现孔径和孔数对液膜高度影响基本相同,都是随着数值的增大而液膜高度减小.孔径为1.3 mm、孔数为8时液膜高度都分别为零,气液分离失效,但是干度和流量的对液膜高度影响趋势却相反.在干度为0.5、流量为0.058 kg/s时液膜高度也都分别为零,气液分离失效.
To analyze the capillary effect on the liquid vapor separation in liquid vapor separation condenser, a mathematical model has been established. The effects of static pressure, gravitational force, capillary pressure and shear stress were included in the model, and the effects of different orifice diameter, number, their combination, inlet quality and flow rate were researched. The results show that orifice diameter and orifice number have similar effects on performance. The liquid film height decreases while the diameter or number increases. The film height disappears when the diameter is 1.3 mm and the number is 8. But inlet flow rate and quality have opposite effects. The film height disappears when the quality is 0. 5 and flow rate is 0. 058 kg/s.
出处
《广东工业大学学报》
CAS
2012年第4期90-95,共6页
Journal of Guangdong University of Technology
基金
国家自然科学基金资助项目(U0934006)
粤港领域关键重点突破项目(2009Z011)
关键词
气液分离
孔径
孔数
干度
流量
毛细作用
liquid vapor separation
orifice diameter
orifice number
quality
flow rate
capillary effect
