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Effects of upwind area of tube inserts on heat transfer and flow resistance characteristics of turbulent flow
Guo, Jian1; Yan, Yuexiang2; Liu, Wei2; Jiang, Fangming1; Fan, Aiwu2
2013-07-01
Source PublicationEXPERIMENTAL THERMAL AND FLUID SCIENCE
Volume48Pages:147-155
AbstractEffects of reducing the upwind area of conical-strip tube inserts on heat transfer and friction factor characteristics of turbulent flow are experimentally investigated. The conical-strip insert resembles one quarter of the conical-ring insert in terms of its upwind area. Results show that the Nusselt number for the case with conical-strip inserts is only 53-56% of that for the case with conical-ring inserts, the friction factor for the former is merely 4-6% of that for the latter, and thus the thermo-hydraulic performance factor can be enhanced by 36-61% if replacing conical-ring inserts with conical-strip inserts for turbulent flow within Re range 5000-25,000. In addition, a comparative study of the short conical strip and the T-type conical strip, which can be regarded as boundary-cutting and core-cutting to the normal conical strip respectively, is performed. Results indicate that the flow resistance can be reduced by both methods. However, a weakened heat transfer and a worsened thermo-hydraulic performance are obtained for the case with boundary-cutting strip inserts. In contrast, the case with T-type core-cutting conical-strip inserts, if a suitable core-cutting size is taken, shows a better thermo-hydraulic performance as compared with the case with normal conical-strip inserts when the Reynolds number is relatively large. Effects of the pitch between neighboring strips have also been examined. It is found that smaller pitch leads to higher heat transfer rate whereas the flow resistance is increased. A moderate pitch between conical strips is beneficial to the overall thermo-hydraulic performance. (c) 2013 Elsevier Inc. All rights reserved.
SubtypeArticle
KeywordUpwind Area Heat Transfer Flow Resistance Enhanced Tube Conical-strip Insert Turbulent Flow
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1016/j.expthermflusci.2013.02.017
WOS Subject ExtendedThermodynamics ; Engineering ; Physics
WOS KeywordTWISTED-TAPE ELEMENTS ; FRICTION FACTOR CHARACTERISTICS ; PRESSURE-DROP CORRELATIONS ; CONICAL STRIP INSERTS ; LAMINAR-FLOW ; THERMOHYDRAULIC CHARACTERISTICS ; TRANSFER BEHAVIORS ; RING TURBULATORS ; ISOTHERMAL TUBES ; PERFORMANCE
Indexed BySCI
Language英语
WOS SubjectThermodynamics ; Engineering, Mechanical ; Physics, Fluids & Plasmas
WOS IDWOS:000319536900017
Citation statistics
Cited Times:30[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/10090
Collection中国科学院广州能源研究所
Affiliation1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Key Lab Renewable Energy & Gas Hydrate, Lab Adv Energy Syst, Guangzhou 510640, Guangdong, Peoples R China
2.Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Wuhan 430074, Peoples R China
Recommended Citation
GB/T 7714
Guo, Jian,Yan, Yuexiang,Liu, Wei,et al. Effects of upwind area of tube inserts on heat transfer and flow resistance characteristics of turbulent flow[J]. EXPERIMENTAL THERMAL AND FLUID SCIENCE,2013,48:147-155.
APA Guo, Jian,Yan, Yuexiang,Liu, Wei,Jiang, Fangming,&Fan, Aiwu.(2013).Effects of upwind area of tube inserts on heat transfer and flow resistance characteristics of turbulent flow.EXPERIMENTAL THERMAL AND FLUID SCIENCE,48,147-155.
MLA Guo, Jian,et al."Effects of upwind area of tube inserts on heat transfer and flow resistance characteristics of turbulent flow".EXPERIMENTAL THERMAL AND FLUID SCIENCE 48(2013):147-155.
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