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Its diffusivity is close to gas while the density level is equal to liquid. Such special characteristics lead to a different pattern in heat transfer under supercritical pressure conditions compared to subcritical pressure situations. According to the heat transfer properties of water, carbon dioxide as well as carbon and hydrogen fuels under supercritical conditions, this paper gives an analysis on supercritical fluid heat transfer characteristics, and summaries the influences of the physical factors (buoyancy, heat flow density, mass flow, pressure and inlet temperature) on fluid heat transfer properties, in which the buoyancy, heat flow density and mass flow are dominant factors. This paper also makes a comprehensive analysis of supercritical fluid heat transfer patterns inside the tube. 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超临界流体传热特性研究综述
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超临界流体传热特性研究综述
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王英杰
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    中航发动机控股有限责任公司,北京 100028
Review of Supercritical Fluid Heat Transfer Characteristic
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出版时间: 2012-11-18 doi: 10.3981/j.issn.1000-7857.2012.33.013
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超临界状态下流体状态介于液态和气态之间,其扩散性更接近气体,密度依然为液体量级,这种特殊的性质导致超临界压力下流体流动换热特性与亚临界压力下有很大不同.本文以超临界压力条件下水、二氧化碳和碳氢燃料为研究对象,综合分析了超临界流体在管内的换热规律,系统总结了浮升力、热流密度、质量流速、压力、进口温度、流道形状等因素对流动换热特性的影响.其中,浮升力、热流密度和质量流速影响作用较大,在较高热流密度条件下,浮升力会导致传热恶化发生;在较低热流密度下,流体临界点附近会发生传热强化;质量流速增加能够使管内换热效果显著增强.传热强化和传热恶化现象的发生与临界点附近流体物性的剧烈变化密切相关.
超临界流体  /  流动  /  传热  /  热流密度  /  传热恶化
The fluid state in supercritical conditions is between liquid and gas. Its diffusivity is close to gas while the density level is equal to liquid. Such special characteristics lead to a different pattern in heat transfer under supercritical pressure conditions compared to subcritical pressure situations. According to the heat transfer properties of water, carbon dioxide as well as carbon and hydrogen fuels under supercritical conditions, this paper gives an analysis on supercritical fluid heat transfer characteristics, and summaries the influences of the physical factors (buoyancy, heat flow density, mass flow, pressure and inlet temperature) on fluid heat transfer properties, in which the buoyancy, heat flow density and mass flow are dominant factors. This paper also makes a comprehensive analysis of supercritical fluid heat transfer patterns inside the tube. The enhancement and deterioration of heat transfer is closely concerned with the changes of supercritical fluid physical properties.
supercritical fluid  /  flow  /  heat transfer  /  heat flow density  /  heat transfer deterioration
王英杰. 超临界流体传热特性研究综述. 科技导报, 2012 , 30 (33) : 74 -79 . DOI: 10.3981/j.issn.1000-7857.2012.33.013
WANG Yingjie. Review of Supercritical Fluid Heat Transfer Characteristic[J]. Science & Technology Review, 2012 , 30 (33) : 74 -79 . DOI: 10.3981/j.issn.1000-7857.2012.33.013
2012年第30卷第33期
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doi: 10.3981/j.issn.1000-7857.2012.33.013
  • 接收时间:2012-09-03
  • 首发时间:2012-11-18
  • 出版时间:2012-11-18
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  • 收稿日期:2012-09-03
  • 修回日期:2012-10-19
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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