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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.v43.i5.40
pages 443-460

HEAT TRANSFER IN THE INITIAL PART OF THERMAL STABILIZATION OF HELICAL CHANNELS IN AIR FLOW

Povilas Poskas
Lithuanian Energy Institute, Branduolines inzinerijos problemas laboratorija, Breslaujos str. 3, LT-44403 Kaunas, Lithuania
Vytautas Simonis
Lithuanian Energy Institute, Branduolinës inzinerijos problemø laboratorija, Breslaujos str. 3, LT-44403 Kaunas, Lithuania

Краткое описание

Experimental results, their analysis and generalization are presented for local heat transfer from the convex and concave surfaces of rectangular helical channels in the initial part of thermal stabilization in air flow over a wide range of operating (Re =103−4·105) and geometrical (D/h = 5−90, b/h = 2−20) parameters in one-side heating.

It was established, according to the helical channels length, that heat transfer from a convex surface decreases and that from a concave surface increases approaching the stabilized values, which in the channel of the highest curvature (D/h = 5.5) reach up to −50% for a convex surface and up to +60% for a concave surface versus those in a straight flat channel. With a decrease of channel curvature (an increase of the parameter D/h), heat transfer intensity from both surfaces decreases in comparison with a straight flat channel. Also, heat transfer stabilization on a convex surface occurs later than on a concave surface or in a straight flat channel.

Correlations were obtained for changes of heat transfer from convex and concave surfaces of helical channels in the initial part of thermal stabilization, in comparison with stabilized heat transfer.


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