Suscripción a Biblioteca: Guest
Portal Digitalde Biblioteca Digital eLibros Revistas Referencias y Libros de Ponencias Colecciones
Journal of Enhanced Heat Transfer
Factor de Impacto: 0.562 Factor de Impacto de 5 años: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Imprimir: 1065-5131
ISSN En Línea: 1026-5511

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

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v12.i1.40
pages 59-72

Evaporation Heat Transfer and Pressure Drop in Micro-Fin Tubes Before and After Tube Expansion

Yun Wook Hwang
Thermo-Fluid System Department, Korea Institute of Machinery and Materials, Daejeon 305-343, Korea
Min Soo Kim
Department of Mechanical Engineering, Seoul National University, Seoul, 08826, Korea
Yongchan Kim
Department of Mechanical Engineering, Korea University, Seoul 136-713, Republic of Korea

SINOPSIS

The objective of this study is to investigate the pressure drop and heat transfer characteristics of micro-fin tubes before and after the tube expansion process. Test tubes are single-grooved micro-fin tubes made of copper with an outer diameter of 9.52 mm before the tube expansion. The direct heating method is applied in order to make the refrigerant evaporate in the micro-fin tubes. The test ranges of the heat flux, mass flux, and saturation pressure are 5−15 kW/m2, 100−200 kg/m2·s, and 540−790 kPa, respectively. The effects of the mass flux, heat flux, and saturation pressure of the refrigerant on the pressure drop and the heat transfer are presented for the refrigerant R22. In the test conditions of this study, the heat transfer coefficient for the micro-fin tube after the tube expansion is about 16.5% smaller than that before the tube expansion because the fin height of the micro-fins reduces and the fin shape becomes flatter. The micro-fin tube after the tube expansion has about 7.7% greater average pressure drop than before the tube expansion process.


Articles with similar content:

INVESTIGATION OF THERMAL-HYDRODYNAMIC HEAT TRANSFER PERFORMANCE OF R-1234ZE AND R-134A REFRIGERANTS IN A MICROFIN AND SMOOTH TUBE
Journal of Enhanced Heat Transfer, Vol.23, 2016, issue 3
Chi-Chuan Wang, Kaggwa Abdul
EFFECT OF LUBRICATING OIL ON THE EVAPORATING HEAT TRANSFER AND PRESSURE DROP OF CARBON DIOXIDE IN A MICRO-CHANNEL TUBE
International Heat Transfer Conference 13, Vol.0, 2006, issue
H.-K. Kim, S. Jeong, S. Lee
CONVECTIVE BOILING HEAT TRANSFER OF WATER IN A CAPILLARY TUBE UNDER A LOW FLOW RATE CONDITION
International Heat Transfer Conference 13, Vol.0, 2006, issue
Fumito Kaminaga, Kunihito Matsumura, Sumith Baduge
Heat Exchange Intensification in the Case of Film Condensation on the Outer Surface of Horizontally Knurled Tubes
Heat Transfer Research, Vol.31, 2000, issue 1-2
K. F. Karimov, V. I. Tsoi, I. I. Zakirov, V. V. Galagan
HEAT TRANSFER AND PRESSURE DROP DURING FLOW BOILING OF R134a AND R404A IN A MICROFIN TUBE AT LOW MASS FLUXES
International Heat Transfer Conference 13, Vol.0, 2006, issue
Hans Mueller-Steinhagen, Klaus K. Spindler