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化工学报  2015 

超临界压力下纳米流体竖直管内流动换热

DOI: 10.11949/j.issn.0438-1157.20140859, PP. 1265-1271

Keywords: 超临界流体,Fe3O4-煤油,纳米颗粒,换热特性,传热关联式

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Abstract:

对超临界压力下Fe3O4-煤油纳米流体竖直管内的换热特性进行了实验研究,分析了不同压力、质量流量、热通量和纳米颗粒浓度对超临界压力下纳米流体换热特性的影响。超临界压力下,纳米流体在竖直管内沿管长呈现不同的换热规律。流体质量流量的提高或者工作压力的提高均会使纳米流体在竖直管内流动换热效果变好。而热通量的增大或纳米颗粒的添加对超临界压力下纳米流体的换热具有恶化效果。最后给出了纳米流体在超临界压力下的传热关联式,其计算值和实验值吻合良好。

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