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Heat Transfer Research
Импакт фактор: 0.404 5-летний Импакт фактор: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN Печать: 1064-2285
ISSN Онлайн: 2162-6561

Выпуски:
Том 50, 2019 Том 49, 2018 Том 48, 2017 Том 47, 2016 Том 46, 2015 Том 45, 2014 Том 44, 2013 Том 43, 2012 Том 42, 2011 Том 41, 2010 Том 40, 2009 Том 39, 2008 Том 38, 2007 Том 37, 2006 Том 36, 2005 Том 35, 2004 Том 34, 2003 Том 33, 2002 Том 32, 2001 Том 31, 2000 Том 30, 1999 Том 29, 1998 Том 28, 1997

Heat Transfer Research

DOI: 10.1615/HeatTransRes.v44.i7.10
pages 589-602

EXPERIMENTAL INVESTIGATION OF OPPOSING MIXED CONVECTION HEAT TRANSFER IN A VERTICAL FLAT CHANNEL IN THE TRANSITION REGION. 1. ANALYSIS OF LOCAL HEAT TRANSFER

Robertas Poskas
Lithuanian Energy institute; Kaunas Univerity of Technology, Kaunas, Lithuania
Arunas Sirvydas
Lithuanian Energy Institute, Branduolinës inþinerijos problemø laboratorija, Breslaujos str. 3, LT-44403 Kaunas
Jokubas Kolesnikovas
Lithuanian Energy Institute, Branduolinës inzinerijos problemø laboratorija, Breslaujos str. 3, LT-44403 Kaunas, Lithuania
Raimondas Kilda
Lithuanian Energy Institute, Branduolinës inzinerijos problemø laboratorija, Breslaujos str. 3, LT-44403 Kaunas, Lithuania

Краткое описание

In this paper, the results of experimental investigation into the local opposing mixed convection heat transfer in a vertical flat channel in the transition region are presented. Variation of the local heat transfer rate at different air pressures (0.1−0.4 MPa), i.e., in the case of different buoyancy effects, was analyzed. The analysis of the results revealed a significant increase in the heat transfer rate on increase in the buoyancy effect at a certain value of x/de. This is related to the change in the flow regime, i.e., formation or disappearance of vortices. Moreover, it was determined that in the case of vortical flow, the heat transfer rate is significantly higher than in the case of turbulent flow, and the transition to turbulent flow occurs at higher Re numbers. Therefore, the results obtained change the concept of the transition from laminar to turbulent flow under a significant buoyancy effect.


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