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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.v40.i5.100
pages 485-504

Self-Similarity of Differential Equations and Heat Transfer Patterns of a Turbulent Near-Wall Layer

Vytautas Vincentas Makarevicius
Lithuanian Energy Institute, Breslaujos str. 3, LT-44403 Kuanas, Lithuania

Краткое описание

After looking at the works performed it becomes obvious that one of the most significant things is recast of a turbulent near-wall layer into locally self-similar one (depending on one coordinate). To solve this task, a number of steps were undertaken, such as determination of a new generalized coordinate, selection of constants and their determination. It should be noted that such recast of near-wall layer equations was carried out for the first time. The recast of equations of this type into locally self-similar ones enables one to ensure high accuracy of the iteration solution, however, powerful means are required — up-to-date computers and software. Such means had not been available previously, thus iteration solutions of quadratures were not performed. Application of the concurrent iteration solution method together with total solution of differential equations may be used with the objective of higher accuracy. Another important task is the determination of boundary heat transfer patterns in cases of variable physical properties. These patterns enable one to choose generalized heat transfer expressions. It was revealed that at high flow temperature turbulence and heat transfer decrease the velocity and temperature profiles change. This phenomenon has a practical value. At high flow temperatures there is no need to install turbulizers for intensification of heat transfer processes since no positive results will be obtained. The latter pattern comprises discovery elements.


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