Influence of combined non-uniform wire coil and twisted tape inserts on thermal performance characteristics

被引：135

作者：

Eiamsa-ard, S. ^{[2
]}

Nivesrangsan, P. ^{[2
]}

Chokphoemphun, S. ^{[1
]}

Promvonge, P. ^{[1
]}

机构：

[1] King Mongkuts Inst Technol Ladkrabang, Dept Mech Engn, Fac Engn, Bangkok 10520, Thailand

[2] Mahanakorn Univ Technol, Dept Mech Engn, Fac Engn, Bangkok 10530, Thailand

来源：

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER | 2010年 / 37卷 / 07期

关键词：

Heat transfer enhancement; Variable/non-uniform wire coil; Twisted tape; Wire coil; HEAT-TRANSFER; PRESSURE-DROP; TUBES; ENHANCEMENT; FLOW; AUGMENTATION; CONDENSATION;

D O I：

10.1016/j.icheatmasstransfer.2010.05.012

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

In this paper, heat transfer, friction factor and thermal performance behaviors in a tube equipped with the combined devices between the twisted tape (TT) and constant/periodically varying wire coil pitch ratio are experimentally investigated. The periodically varying three coil pitch ratios were arranged into two different forms: (1) D-coil (decreasing coil pitch ratio arrangement) and (2) DI-coil (decreasing/increasing coil pitch ratio arrangement) while the twisted tapes were prepared with two different twist ratios. Each device alone is also tested and the results are subjected for comparison with those from the combined devices. The experiments were conducted in a turbulent flow regime with Reynolds numbers ranging from 4600 to 20,000 using air as the test fluid. Compared to each enhancement device, the heat transfer rate is further augmented by the compound devices. Over the range investigated, the highest thermal performance factor of around 1.25 is found by using DI-coil in common with the TT at lower Reynolds number. In addition, the empirical correlations of the heat transfer (Nu) and pressure drop (f) are also presented. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：850 / 856

页数：7

共 20 条

[1] Heat transfer augmentation by coiled wire inserts during forced convection condensation of R-22 inside horizontal tubes [J].

Agrawal, KN ;

Kumar, A ;

Behabadi, MAA ;

Varma, HK .

INTERNATIONAL JOURNAL OF MULTIPHASE FLOW, 1998, 24 (04) :635-650

[2] Pressure drop increase of forced convective condensation inside horizontal coiled wire inserted tubes [J].

Akhavan-Behabadi, M. A. ;

Salimpour, M. R. ;

Pazouki, V. A. .

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER, 2008, 35 (09) :1220-1226

[3] Heat transfer and pressure drop characteristics of forced convective evaporation in horizontal tubes with coiled wire inserts [J].

Akhavan-Behabadi, M. A. ;

Mohseni, S. G. ;

Najafi, H. ;

Ramazanzadeh, H. .

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER, 2009, 36 (10) :1089-1095

[4]

ARICI ME, 1994, ASME PD ADV HEAT TRA, V64, P113

[5]

DEWAN A, 2004, J POWER ENERGY, V218, P509

[6] Enhancement of laminar and transitional flow heat transfer in tubes by means of wire coil inserts [J].

Garcia, Alberto ;

Solano, Juan P. ;

Vicente, Pedro G. ;

Viedma, Antonio .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2007, 50 (15-16) :3176-3189

[7] Heat transfer enhancement in a tube with equilateral triangle cross sectioned coiled wire inserts [J].

Gunes, Sibel ;

Ozceyhan, Veysel ;

Buyukalaca, Orhan .

EXPERIMENTAL THERMAL AND FLUID SCIENCE, 2010, 34 (06) :684-691

[8]

INABA H, 2002, T JSME B, V68, P481

[9]

Incropera FrankP., 2002, INTRO HEAT TRANSFER, V4th

[10] Flow pattern and flow characteristics for counter-current two-phase flow in a vertical round tube with wire-coil inserts [J].

Kim, HY ;

Koyama, S ;

Matsumoto, W .

INTERNATIONAL JOURNAL OF MULTIPHASE FLOW, 2001, 27 (12) :2063-2081

← 1 2 →