%0 Journal Article
%A Sirvydas, Arunas
%A Poskas, Robertas
%D 2010
%I Begell House
%K heat transfer, air flow, laminar opposing mixed convection, transition to vortex flow, vertical flat channel, symmetrical heating, numerical simulation
%N 5
%P 509-520
%R 10.1615/HeatTransRes.v41.i5.20
%T Numerical Investigations of Opposing Mixed Convection Heat Transfer in Vertical Flat Channel. 1. Laminar Mixed Convection and Transition to Vortex Flow in the Case of Symmetrical Heating
%U http://dl.begellhouse.com/journals/46784ef93dddff27,78eab4421dedde24,05fdb30f4e186eda.html
%V 41
%X In this paper we present the results of numerical investigation into the local opposing mixed convection heat transfer in a vertical flat channel with symmetrical heating in laminar airflow. Numerical two-dimensional simulation was performed using FLUENT 6.1 code. The investigations were performed under steady state flow conditions in airflow of 0.1; 0.2 and 0.4 MPa pressure at the Reynolds numbers from 1.5·10^{3} up to 4.3·10^{3} with the Gr_{q} number varying from 1.65·10^{5} to 3.1·10^{9} in order to define the effect of the influence of buoyancy on heat transfer. Numerical modeling demonstrates that under small buoyancy effect there are only small transformations in the velocity profile but flow is oriented downward (direction of forced flow). With increase in buoyancy forces, the flow separation occurs at some distance from the beginning of the heated channel section. With further increase in buoyancy, the position point of flow separation moves towards the beginning of a heated section. The channel wall temperature decreases noticeably at the flow separation point. Correlations for calculating heat transfer in the laminar mixed convection region and for the determination of the position of flow separation from the wall are suggested.
%8 2010-11-22