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磁纳米流体对微细通道饱和沸腾CHF特性的影响

Effect of Magnetic Nano-Fluids on CHF Characteristics of Saturated Boiling of Microchannels
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摘要 以去离子水和w(Fe_3O_4)=0.5%的磁纳米流体为实验工质,在3种不同尺寸的矩形微细通道内进行饱和流动沸腾传热实验,研究了流动沸腾传热过程中质量流速、有无磁场作用下的磁纳米流体对CHF特性的影响.结果表明:去离子水和0.5%的磁纳米流体的CHF值均随质量流速的增大而增大,且质量流速较小时,CHF值增幅较明显;无外加磁场时,0.5%的磁纳米流体的CHF值相比去离子水可提高71%~157%;0.5%的磁纳米流体的CHF值随着磁场强度的增加而增大,增加幅度约为4%~17.4%;将实验值与Kosar模型预测值进行对比,发现工质为去离子水和0.5%的磁纳米流体时平均绝对误差分别为25%、30%,而对Kosar模型进行修正后,平均相对误差均小于15%,实验结果预测性明显提高. The deionized water and w(Fe3O4)=0.5%of magnetic nano-fluids were taken as the working fluids to perform saturated flow boiling transfer heat experiments in the three different sizes of rectangular micro-channels.And the effect on the characteristics of CHF by nano-fluids was considered mass flow rate and magnetic field in the process of the flow boiling transfer heat was explored.The experimental results shows that the CHF values of deioni-zed water and 0.5%magnetic fluid both increase with the increased mass flow rate.And the increase of CHF value is relatively obvious when the mass flow rate is low.The CHF values of 0.5%of magnetic nano-fluids can be increased by approximately 71%~157%than deionized water when there is no magnetic field.The CHF values of 0.5%of magnetic fluid increase with magnetic field strengthening and the increase rate is about 4%~17.4%.Compared the experimental values with the predicted values of Kosar model,the MAE values of deionized water and magnetic fluid are 25%and 30%respectively.After the modification of Kosar model,the MAE values are both less than 15%.Obviously,the prediction of the experimental results is improved.
作者 罗小平 李海燕 唐杨 吴迪 LUO Xiaoping;LI Haiyan ;TANG Yang;WU Di(School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China)
出处 《华南理工大学学报(自然科学版)》 EI CAS CSCD 北大核心 2018年第1期1-8,共8页 Journal of South China University of Technology(Natural Science Edition)
基金 国家自然科学基金资助项目(21776096)~~
关键词 微细通道 磁纳米流体 饱和流动 沸腾传热 磁场 质量流速 CHF microchannel magnetic nanofluids saturated flow boiling transfer heat magnetic field mass flow critical heat flux
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