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Title:
The effect of gravity on R410A condensing flow in horizontal circular tubes
Author: Li, Wei; Zhang, Jingzhi; Mi, Pengfei; Zhao JF(赵建福); Tao, Zhi; Childs, Peter R. N.; Shih, Tom I. -P.
Source: NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
Issued Date: 2017
Volume: 71, Issue:3, Pages:327-340
Abstract: Heat 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.
Language: 英语
Indexed Type: SCI ; EI
Corresponding Author: Li, W (reprint author), Zhejiang Univ, Dept Energy Engn, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China.
Correspondent Email: weili96@zju.edu.cn
DOI: 10.1080/10407782.2016.1264743
DOC Type: Article
WOS Subject: Thermodynamics ; Mechanics
WOS Subject Extended: Thermodynamics ; Mechanics
WOS Keyword Plus: CONDENSATION HEAT-TRANSFER ; FILM CONDENSATION ; CONVECTIVE CONDENSATION ; SURFACE-TENSION ; TRANSFER MODEL ; PRESSURE-DROP ; MICROFIN TUBE ; MICROGRAVITY ; MICROCHANNELS ; INCLINATION
WOS ID: WOS:000396590600006
ISSN: 1040-7782
Funder: National Science Foundation of Zhejiang Province, China [LZ13E060001] ; National Science Foundation of China [51210011] ; Zhejiang Provincial Public Projects (analysis and test) of Zhejiang Province [2015C37027]
Rank: [Li, Wei] Zhejiang Univ, Dept Energy Engn, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China; [Zhang, Jingzhi; Mi, Pengfei; Childs, Peter R. N.] Imperial Coll London, Dyson Sch Design Engn, London, England; [Zhang, Jingzhi] Zhejiang Univ, Coinnovat Ctr Adv Aeroengine, Hangzhou, Zhejiang, Peoples R China; [Zhao, Jianfu] Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Beijing, Peoples R China; [Tao, Zhi] Beijing Univ Aeronaut & Astronaut, Sch Energy & Power Engn, Beijing, Peoples R China; [Shih, Tom I. -P.] Purdue Univ, Sch Aeronaut & Astronaut, W Lafayette, IN 47907 USA
Classification: 二类
Ranking: 4
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/72134
Appears in Collections:国家微重力实验室_期刊论文

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Recommended Citation:
Li, Wei,Zhang, Jingzhi,Mi, Pengfei,et al. The effect of gravity on R410A condensing flow in horizontal circular tubes[J]. NUMERICAL HEAT TRANSFER PART A-APPLICATIONS,2017-01-01,71(3):327-340.
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