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Journal of Enhanced Heat Transfer
Facteur d'impact: 0.562 Facteur d'impact sur 5 ans: 0.605 SJR: 0.211 SNIP: 0.361 CiteScore™: 0.33

ISSN Imprimer: 1065-5131
ISSN En ligne: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v13.i2.30
pages 117-137

Performance Characteristics of Some "Rough Surfaces" with Tube Inserts for Single-Phase Flow

Ventsislav D. Zimparov
Gabrovo Technical University, 4 Hadji Dimitar Strasse, 5300 Gabrovo, Bulgaria
Plamen J. Penchev
Gabrovo Technical University, 4, H. Dimitar Str., 5300 Gabrovo, Bulgaria
Arthur E. Bergles
Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York; University of Maryland, College Park, Maryland; Massachusetts Institute of Technology, Cambridge, Massachusetts, USA

RÉSUMÉ

One of the most promising heat transfer enhancement techniques is the compound enhancement method, in which different enhancement techniques are used simultaneously. This study compares the characteristics of some passive combined techniques for single-phase flow studied up to now: rough tube (sand-grain roughness), internally grooved rough tube, three-dimensional internal extended surface, and corrugated tube — all of them combined with twisted-tape inserts. An internally grooved tube with wire coil inserts is also considered. The performance characteristics of these combinations of "rough" surfaces with tube inserts have been assessed using traditional performance evaluation criteria extended by entropy generation. The goal is to evaluate the influence of the characteristic parameters of the tubes: protuberance-height-to-diameter ratio e/Di, relative pitch p/e, relative helix angle (β*, and others, and the relative pitch of the twisted tape or wire coil H/Di on the thermodynamic efficiency. The benefits of replacing the smooth tubes in shell-and-tube heat exchangers were evaluated for different practical applications. The optimal thermodynamic performance can be defined by minimization of the enhancement entropy generation number compared with the relative increase of the heat transfer rate or relative reduction of the heat transfer area.


Articles with similar content:

Compound Heat Transfer Enhancement - Performance Characteristics of Some "Rough Surfaces" with Twisted Tape Inserts
ICHMT DIGITAL LIBRARY ONLINE, Vol.2, 2004, issue
Plamen J. Penchev, Ventsislav D. Zimparov
ENHANCEMENT OF HEAT TRANSFER BY A COMBINATION OF A SINGLE START SPIRALLY CORRUGATED TUBES WITH A TWISTED TAPE
ICHMT DIGITAL LIBRARY ONLINE, Vol.1, 2000, issue
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Abstract of "ENHANCEMENT OF HEAT TRANSFER BY A COMBINATION OF A SINGLE START SPIRALLY CORRUGATED TUBES WITH A TWISTED TAPE"
ICHMT DIGITAL LIBRARY ONLINE, Vol.1, 2000, issue
Ventsislav D. Zimparov
Compound heat transfer enhancement by a combination of spirally corrugated tubes with a twisted tape
International Heat Transfer Conference 12, Vol.47, 2002, issue
Ventsislav D. Zimparov, Valentin Metodiev Petkov
PERFORMANCE CHARACTERISTICS OF DEEP CORRUGATED TUBES WITH TWISTED-TAPE INSERTS
Journal of Enhanced Heat Transfer, Vol.19, 2012, issue 1
Arthur E. Bergles, Ventsislav D. Zimparov, Valentin Metodiev Petkov