NUMERICAL INVESTIGATION OF HEAT TRANSFER FROM A POROUS PLATE WITH TRANSPIRATION COOLING

Year 2018, Volume: 4 Issue: 1, 1632 - 1647, 05.12.2017

Mustafa Kılıç

https://doi.org/10.18186/journal-of-thermal-engineering.362048

Cited By: 6

Abstract

The present study is focused on
investigation of heat transfer from a porous plate by cooling of air and
surface with transpiration cooling. Effects of Reynolds number of hot air (Re=
3035, 3200, 3300, 3580), effects of flow rate of water as a coolant (ṁ_water=
0.000083, 0.000116, 0.000166, 0.000249 kg/s) on local wall temperature and
cooling efficiency of porous flat and the system inside a rectangular channel
with air as a hot gas stream and water as a coolant were investigated
numerically. In this study; different from the literature, transpiration
cooling was used as a cooling mechanism of air. It was observed from the
results that increasing Reynolds number causes an increase on surface
temperature and a decrease on cooling efficiency of porous plate and system.
Increase of Reynolds number from Re=3035 to 9430 causes a decrease of
efficiency of the system of 13.7%. Increasing water flow rate nine times causes
not only a decrease on average surface temperature of 1.1% but also an increase
of 6.5% on efficiency of porous plate and an increase of 19.1% on cooling efficiency
of the system. Numerical results prepared by RNG k-ε turbulence model generally
have a good approximation with experimental results.

Keywords

Computational Fluid Dynamics, Heat Transfer, Porous Plate, Transpiration cooling

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