Effect of the type of thermal boundary conditions on heat transfer and skin-friction in a convergent channel
A.Yu. Sakhnov, K.V. Bryzgalov, V.S. Naumkin, K.S. Lebeda
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Keywords: boundary layer, heat transfer, laminarization, velocity overshoot, numerical modeling, favorable pressure gradient
Abstract
Investigation results on the air flow in a convergent channel with a hot bottom wall at a set constant heat flux or a set constant wall temperature are presented. The numerical simulation was carried out in the OpenFOAM software using the k-ω- SST turbulence model. The verification of simulation results demonstrated a good agreement between the calculated data and the experimental velocity profiles and the thermal Stanton number. The study showed that an increase in the temperature of the convergent channel wall leads to the phenomenon of the streamwise velocity overshoot, suppression of turbulence and a decrease in the skin-friction coefficient and thermal Stanton number. In contrast to a zero pressure gradient flow, the type of thermal boundary conditions has a noticeable effect on the skin-friction and heat transfer in the convergent channel.
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