Heat transfer and dry-out characteristics of CO2 in mini-channel

doi:10.16085/j.issn.1000-6613.2015.08.009

Abstract

Abstract: This paper reviewed the present membrane technologies in landfill leachate treatment. Compared with conventional treatment technologies, membrane separation technologies have the advantage of low-energy and high efficiency. Aiming at different treatment purposes, four membranes, including microfiltration(MF), ultrafiltration(UF), nanofiltration(NF) and reverse osmosis(RO) have been applied in complex landfill leachate treatment. MF and UF are used as pretreatment methods, whereas NF and RO are suitable for the deep treatment of the wastewater. However, membrane fouling is a great inhibition of the application of membrane technologies. Development of new membrane materials, effective pre-treatment technologies, and optimization of membrane process parameters should be the focus of membrane technologies to prevent membrane fouling.

Key words: carbon dioxide, microchannels, boiling heat transfer, critical heat flux(CHF), dryout, microscale

摘要： CO₂作为一种天然制冷剂在微通道内应用具有很大的换热优势,然而由于微尺度效应及其物性,在低干度区容易发生干涸,严重影响换热效果。为研究微细通道内CO₂流动沸腾换热与干涸特性,搭建了相应实验装置,对内径分别为1mm、2mm、3mm以及内表面粗糙度为16μm的不锈钢管,在CO₂制冷剂热流密度2~34kW/m²、质量流率50~1350kg/(m²·s)、饱和温度-10~15℃下进行换热性能与干涸实验对比研究。结果表明:常规管径换热特性在微细通道内不再适用;热流密度的增加对于强化核态沸腾换热具有显著影响,高于临界热流密度(critical heat flux,CHF)则发生干涸;质量流率对于核态沸腾区换热系数的影响则较小;不同饱和温度时换热特性有所不同,高饱和温度下换热系数随其升高而提高,低饱和温度下则相反;干涸过程对总换热系数的影响占34%。研究结论为CO₂微通道换热器的研究开发提供理论依据。

关键词: 二氧化碳, 微通道, 沸腾换热, 临界热流密度, 干涸, 微尺度

CLC Number:

TB69

LU Zhiling, LIU Jianhua, ZHANG Liang, ZHANG Rui, WU Hao, QI Liangkui. Heat transfer and dry-out characteristics of CO₂ in mini-channel[J]. Chemical Industry and Engineering Progree, 2015, 34(08): 2961-2966.

陆至羚, 柳建华, 张良, 张瑞, 吴昊, 祁良奎. 微细通道内CO₂沸腾换热与干涸特性[J]. 化工进展, 2015, 34(08): 2961-2966.

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Heat transfer and dry-out characteristics of CO₂ in mini-channel

微细通道内CO₂沸腾换热与干涸特性

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