Thermo-hydraulic investigation of two stepped micro pin fin heat sink having variable step size

¹ Department of Mechanical Engineering, K. R. Mangalam University, Gurgaon - 122103, India
² Department of Mechanical Engineering, Graphic Era Deemed to be University, Clementown, Dehradun - 248002, Uttarakhand
³ Department of Thermal Engineering, Faculty of Technology, Veer Madho Singh Bhandari Uttarakhand Technical University, Dehradun 248007, India
⁴ Department of Mechanical Engineering, Graphic Era Hill University, Dehradun 248007, India
⁵ Division of Research & Innovation, Uttaranchal University, Dehradun, India,
⁶ Department of Civil Engineering, GRIET, Bachupally, Hyderabad, Telangana
⁷ Lovely Professional University, Phagwara Punjab, 144001, India
⁸ KG Reddy College of Engineering & Technology, Moinabad, Hyderabad, Telangana

^* Corresponding author: prabhakar.bhandari40@gmail.com

Abstract

To achieve enhanced flux dissipation, microchannels heat sink are being effectively implemented in various engineering processes. Here, a numerical analysis is to be carried out on an open stepped micro pin fin heat sink (MPFHS) with different step size. The stepped pin fin heat sink (PFHS) having varied fin height in an array of two fins having inline arrangement. For the simulation purpose, a single-phase water was used as working fluid with variable thermophysical properties. The present configuration has operated for Reynolds number =100-500, heat flux of 500 kW/m2. The step variation of 100 µm, 200 µm and 300 µm has been considered. It was observed that with increase in step size, the heat transfer augmentation also increases. However, at higher Reynold number, the present studies does not provide effective results in terms of sustainability.