Доступ предоставлен для: Guest
Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Journal of Enhanced Heat Transfer
Импакт фактор: 0.562 5-летний Импакт фактор: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Печать: 1065-5131
ISSN Онлайн: 1026-5511

Выпуски:
Том 27, 2020 Том 26, 2019 Том 25, 2018 Том 24, 2017 Том 23, 2016 Том 22, 2015 Том 21, 2014 Том 20, 2013 Том 19, 2012 Том 18, 2011 Том 17, 2010 Том 16, 2009 Том 15, 2008 Том 14, 2007 Том 13, 2006 Том 12, 2005 Том 11, 2004 Том 10, 2003 Том 9, 2002 Том 8, 2001 Том 7, 2000 Том 6, 1999 Том 5, 1998 Том 4, 1997 Том 3, 1996 Том 2, 1995 Том 1, 1994

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v12.i4.60
pages 373-384

Augmentation of Forced Convection Condensation Heat Transfer Inside a Horizontal Tube Using Spiral Spring Inserts

M. A. Akhavan-Behabadi
University of Roorkee, Roorkee-247 667, India; Center of Excellence in Design and Optimization of Energy Systems, School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran
M. R. Salimpoor
Department of Mechanical Engineering, Faculty of Engineering, University of Tehran, Tehran, Iran
Ravi Kumar
Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India
K. N. Agrawal
Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee-247667, India

Краткое описание

An experimental investigation has been carried out to study the augmentation of the heat-transfer coefficient during condensation of R-134a vapor inside a horizontal tube with different spiral spring inserts. The test condenser was a double-pipe counter-flow heat exchanger of 1040-mm length; the refrigerant flowed inside the inner tube and the cooling water flowed in the annulus. Four spiral springs of 1.0-mm diameter and different pitches of 5, 8, 10, and 13 mm were inserted, one by one, on the refrigerant side of a test-condenser tube. For each spiral spring insert, the data were acquired for the mass flow rates of 87, 105, 122, and 144 kg/m2·s. The spiral spring of 10-mm pitch gave the highest enhancement in the heat-transfer coefficient, h, in a range of 65 to 75% in comparison to that for a plain tube. Subsequently, three more spiral spring inserts of 10-mm pitch and 0.5-, 0,7-, and 1.5-mm coil-wire diameter were also tested. The spiral spring with 1.5-mm wire diameter outperformed the other spiral spring inserts and increased the condensing side heat-transfer coefficient, h, in a range of 75 to 80% in comparison to that for a plain tube. In addition, the influence of vapor quality on the heat-transfer coefficient, h, is also investigated. An empirical correlation has been developed to predict the heat-transfer coefficient, h, during condensation inside a horizontal tube in the presence of a spiral spring insert.


Articles with similar content:

Heat transfer coefficient and pressure drop characteristics of R410A condensation during upward flow in vertical smooth and micro-fin tubes
Second Thermal and Fluids Engineering Conference, Vol.43, 2017, issue
Yunxiao Yang , Li Jia, Qi Peng
CONDENSATION HEAT TRANSFER AND PRESSURE DROP CHARACTERISTICS OF R-134A IN HORIZONTAL SMOOTH TUBES AND ENHANCED TUBES FABRICATED BY SELECTIVE LASER MELTING
International Heat Transfer Conference 16, Vol.7, 2018, issue
Kai Choong Leong, Xuwen Wang, Teck Neng Wong , Jin Yao Ho
Heat Transfer in Turbulent Flow Through Tube with Wire-Coil Inserts
Journal of Enhanced Heat Transfer, Vol.12, 2005, issue 4
Sarkar Rashid, M. Zaidul Islam, M. A. Islam
CONDENSATION HEAT TRANSFER OF R-134A ON SINGLE HORIZONTAL THREE-DIMENSIONAL STRUCTURED TUBES
International Heat Transfer Conference 16, Vol.7, 2018, issue
Stephan Kabelac, Ruben Steinhoff, X. Luo
Numerical Analyses of Effects of Tube Shape on Performance of a Finned Tube Heat Exchanger
Journal of Enhanced Heat Transfer, Vol.11, 2004, issue 1
Jingchun Min, Ralph L. Webb