磁场及纳米磁性流体强化氨水鼓泡吸收实验研究  

Experimental research on NH_3/H_2O bubble absorption behavior with magnetic nano-magnetic fluid and rotating magnetic field

作　　者：张春[1] 武卫东[1] 李增扬[1] 丁澎[1] 

机构地区：[1]上海理工大学制冷与低温工程研究所,上海200093

出　　处：《磁性材料及器件》2014年第3期21-24,50,共5页Journal of Magnetic Materials and Devices

摘　　要：针对吸收式制冷传质过程的强化,设计并搭建了一套带有旋转磁场的氨水鼓泡吸收实验系统,探讨了Fe3O4纳米磁流体、静止磁场和旋转磁场对氨水鼓泡吸收特征的影响.实验结果表明,氨气在水中吸收量随Fe3O4纳米磁流体浓度增加先增加后减小,最佳浓度约在0.2wt％左右,吸收率为0.49 g/min; 0～260mT磁场强度范围内,吸收率随磁场增强相应增加,旋转磁场的吸收效果优于静止磁场.在旋转磁场强度为260mT、纳米磁流体浓度为0.2wt％时得到最大吸收率0.65 g/min,为无磁场纯水基液中吸收率的1.628倍,分析了强化吸收机理.In order to investigate the enhancement of magnetic field and nano-magnetic fluid on mass transfer for absorption refrigeration, an experimental system was established. The result shows that with increasing Fe3O4 nano-magnetic fluid concentration the amount of ammonia in the water absorption first increases and then decreases, with maximum absorption rate of 0.49 g/rain for nano-magnetic fluid concentration of 0.2wt%. Absorption rate increases with increasing magnetic field strength in field strength range of 0 to 260mT, with better effect for rotating field than static magnetic field. Maximum absorption rate of this study was 0.65 g/min for Fe304 nano-magnetic fluid concentration of 0.2wt% and magnetic field strength of 260 roT, 1.628 times of that in pure water. The mechanisms of enhanced absorption were discussed.

关 键 词：纳米磁流体 旋转磁场 氨水 鼓泡 强化吸收 

分 类 号：TB64[一般工业技术—制冷工程]