EXPERIMENTAL STUDY OF VACUUM SPRAY ICE SLURRY PRODUCTION
An experimental system was built to study the vacuum spray ice slurry system.A high-pressure water pump injects water into a vacuum chamber through a nozzle.The water was atomized,partly evaporated and partly frozen into ice particles.The ice slurry was obtained at the bottom of the chamber.A water trap and a vacuum pump were used to condense the water vapor,remove the non-condensable gas,and maintain the required pressure.The spray flow rate was modulated by a pressure valve.Thermocouples were used to measure the temperature inside the vacuum chamber.A vacuum gauge was used to measure the pressure inside the chamber.Experiments were performed under different conditions to investigate the characteristics of the ice slurry production system.Experiment results show that the temperature at different positions of the chamber was different at first,but all reached a constant value when a dynamic equilibrium was built.There was no significant supercooling when ice particle formed.The injection pressure of water,hence the water flow rate,influences the ice packing factor of the final ice slurry.The lower the water injection pressure,the lower the water flow rate,the higher the ice packing factor.The initial pressure of the chamber before injection also plays a critical part for ice slurry production; only under certain value,the ice particle was formed.The 10% glycol solution was also used as the working fluid.Results showed that it froze at a lower temperature than water.The ice slurry formed with glycol solution was smaller,softer and easier to flow.
Vacuum chamber Spray Crystallization Droplet Ice Slurry
Zhao H.X Lou Y.J Yu Z.T Han J.T
Institute of Refrigeration and Cryogenics,School of Energy and Power,Shandong University Jinan,250061,Shandong,China
国际会议
西安
英文
1-8
2012-08-26（万方平台首次上网日期，不代表论文的发表时间）