CO_(2)在微通道内高速流动特性的研究  

Research on High-speed Flow Characteristics of CO_(2) in Microchannel

作　　者：王亚宾 翁建华 崔晓钰[2] WANG Yabin;WENG Jianhua;CUI Xiaoyu(College of Energy and Mechanical Engineering,Shanghai University of Electric Power,Shanghai 200090,China;School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海电力大学能源与机械工程学院,上海200090 [2]上海理工大学能源与动力工程学院,上海200093

出　　处：《新技术新工艺》2023年第8期54-59,共6页New Technology & New Process

摘　　要：随着科技水平的提高,微尺度流动和传热研究在电子器件研究领域具有广阔的工程应用背景。采用理论计算的方法对CO_(2)气体高速通过矩形微通道制冷器的流动特性进行研究。微通道进口处CO_(2)气体根据压力分为5个不同工况,入口温度均为14℃,在绝热流动与非绝热流动的假设下,选取适当的摩擦因数关联式对上述工况进行理论计算。将微通道分段后估计第1管段的出口流体密度,由关联式可计算得到出口压力与比焓,根据热物性表查得新的出口流体密度并将其与估值进行对比,误差过大时重新估值。对第2管段重复上述计算即可得到其出口参数,以此类推得到所有管段出口流动参数。用同样的方法将相关实验的流动参数代入理论计算,与实验测得数据进行对比分析。结果表明:理论计算结果与实验数据十分吻合,质量流量相同时,进口压力越小,温降越大。With the improvement of science and technology,the study of micro-scale flow and heat transfer has had a broad engineering application background in the field of electronic devices research.The flow characteristics of a rectangular microchannel refrigerator with high-speed CO_(2) gas were studied by theoretical calculation.The CO_(2) gas at the entrance of the microchannel was divided into five different working conditions according to the pressure,and the inlet temperature was all 14℃.Under the assumption of adiabatic flow and non-adiabatic flow,the appropriate correlation formula of friction coefficient was selected to carry out theoretical calculation for the above working conditions.The outlet fluid density of the first segment was estimated after the microchannel was segmented.The outlet pressure and specific enthalpy could be calculated from the correlation equation.New outlet fluid density was measured based on the thermophysical properties and was re-estimated when the error was large compared with the estimates.The outlet parameters of the second section could be obtained by repeating the above calculation,and then all the outlet flow parameters of the duct could be deduced.The flow parameters of relevant experiments were substituted into the above theoretical calculation by the same method,and the results were compared with the experimental data.The results showed that the calculated results were in good agreement with the experimental data.With the same mass flow rate,the smaller was the inlet pressure,the larger was the temperature drop.

关 键 词：微通道 高速流动 温降特性 壅塞 理论计算 微型制冷器 

分 类 号：TK124[动力工程及工程热物理—工程热物理]