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Annals of the Assembly for International Heat Transfer Conference 13

ISBN 1-56700-225-0 / CD 1-56700-226-9

Volumes per year:

various

Year 2006

DOI: 10.1615/IHTC13.p15

OPPOSING MIXED CONVECTION HEAT TRANSFER IN THE VERTICAL FLAT CHANNEL IN A LAMINAR-TURBULENT TRANSITION REGION

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

Robertas Poskas
Lithuanian Energy Institute, Branduolinës inzinerijos problemø laboratorija, Breslaujos str. 3, LT-44403 Kaunas, Lithuania

Arunas Sirvydas
Lithuanian Energy Institute, Branduolinës inþinerijos problemø laboratorija, Breslaujos str. 3, LT-44403 Kaunas, Lithuania

ABSTRACT

In this paper we present the results on experimental and numerical investigation of the local opposing mixed convection heat transfer in a vertical flat channel with symmetrical heating in the laminar-turbulent transition region. The experiments were performed in airflow (p = 0.1, 0.2 and 0.4 MPa) in the range of Re from 2 · 10³ to 5 · 10⁴ and Gr_q up to 1.5 · 10¹⁰. Experiments were performed at the limiting condition q_w1 = q_w2 = const. Numerical two-dimensional simulations were performed for the same channel and for the same conditions as in experiments using the FLUENT 6.1 code.