Numerical Study on the Turbulent Mixed Convective Heat Transfer over 2D Microscale Backward-Facing Step

Sadeq  Salman; Abd Rahim  Abu Talib; Ali  Hilo; Sadeq Rashid  Nfawa; Mohamed Thariq  Hameed Sultan; Syamimi  Saadon

Authors

Sadeq Salman Aerodynamic, Heat Transfer & Propulsion Group, Department of Aerospace Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor Malaysia
Abd Rahim Abu Talib Aerospace Malaysia Research Centre, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
Ali Hilo Aerodynamic, Heat Transfer & Propulsion Group, Department of Aerospace Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor Malaysia
Sadeq Rashid Nfawa Aerodynamic, Heat Transfer & Propulsion Group, Department of Aerospace Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor Malaysia
Mohamed Thariq Hameed Sultan Aerospace Malaysia Research Centre, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
Syamimi Saadon Aerodynamic, Heat Transfer & Propulsion Group, Department of Aerospace Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor Malaysia

Keywords:

turbulent flow, microscale backward-facing step, heat transfer, base fluids

Abstract

The current numerical study investigated over two-dimensional (2D) flat microscale backward-facing step (MBFS). The boundary conditions and the controls fixed by the finite volume method (FVM) and RNG k-? model. The upstream and the step of the wall considered adiabatic, while the downstream of the wall heated by constant heat flux. The straightforward wall of the channel fixed at a constant temperature that is higher than the fluid inlet temperature. The Reynolds number (Re) range of 5,000 ? Re ? 15,000 was used in the study. The results show that the increase in the Re will resulted in increased of Nusselt number (Nu). The study also found that the highest Nu was produced from the ethylene glycol case. The current study also found that the recirculating range at steps is more significant than using water under the same Re by using ethylene glycol.