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The effect of gravity on R410A condensing flow in horizontal circular tubes
Li W; Zhang JZ; Mi PF; Zhao JF(赵建福); Tao Z; Childs PRN; Shih TIP; Li, W (reprint author), Zhejiang Univ, Dept Energy Engn, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China.
Source PublicationNUMERICAL HEAT TRANSFER PART A-APPLICATIONS
2017
Volume71Issue:3Pages:327-340
ISSN1040-7782
AbstractHeat transfer characteristics of R410A condensation in horizontal tubes with the inner diameter of 3.78 mm under normal and reduced gravity are investigated numerically. The results indicate that the heat transfer coefficients increase with increasing gravitational accelerations at a lower mass flux, whereas their differences under varying gravity are insignificant at a higher mass flux. The liquid film thickness decreases with increasing gravity at the top part of the tube, whereas the average liquid film thickness is nearly the same under different gravity accelerations at the same vapor quality and mass flux. The local heat transfer coefficients increase with increasing gravity at the top of the tube and decrease with increasing gravity at the bottom. The proportion of the thin liquid film region is important for the overall heat transfer coefficients for the condensing flow. A vortex with its core lying at the bottom of the tube is observed under normal gravity because of the combined effect of gravity and the mass sink at the liquid-vapor interface, whereas the stream traces point to the liquid-vapor interfaces under zero gravity. The mass transfer rate under zero gravity is much lower than that of normal gravity.
DOI10.1080/10407782.2016.1264743
Indexed BySCI ; EI
Language英语
WOS IDWOS:000396590600006
WOS KeywordCONDENSATION HEAT-TRANSFER ; FILM CONDENSATION ; CONVECTIVE CONDENSATION ; SURFACE-TENSION ; TRANSFER MODEL ; PRESSURE-DROP ; MICROFIN TUBE ; MICROGRAVITY ; MICROCHANNELS ; INCLINATION
WOS Research AreaThermodynamics ; Mechanics
WOS SubjectThermodynamics ; Mechanics
Funding OrganizationNational Science Foundation of Zhejiang Province, China [LZ13E060001] ; National Science Foundation of China [51210011] ; Zhejiang Provincial Public Projects (analysis and test) of Zhejiang Province [2015C37027]
Classification二类
Ranking4
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/72134
Collection国家微重力实验室
Corresponding AuthorLi, W (reprint author), Zhejiang Univ, Dept Energy Engn, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China.
Recommended Citation
GB/T 7714
Li W,Zhang JZ,Mi PF,et al. The effect of gravity on R410A condensing flow in horizontal circular tubes[J]. NUMERICAL HEAT TRANSFER PART A-APPLICATIONS,2017,71(3):327-340.
APA Li W.,Zhang JZ.,Mi PF.,赵建福.,Tao Z.,...&Li, W .(2017).The effect of gravity on R410A condensing flow in horizontal circular tubes.NUMERICAL HEAT TRANSFER PART A-APPLICATIONS,71(3),327-340.
MLA Li W,et al."The effect of gravity on R410A condensing flow in horizontal circular tubes".NUMERICAL HEAT TRANSFER PART A-APPLICATIONS 71.3(2017):327-340.
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