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2 Archives of Thermodynamics

2 2024

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Numerical Investigation of Increasing-Decreasing Stepped Micro Pin Fin Heat Sink Having Various Arrangements

Bhandari Prabhakar, Sharma Vineet, Ranakoti Lalit, Bisht Vijay Singh, Lila Manish Kumar, Kaushik Shivasheesh, Kanojia Nikhil, Srivastava Ayushman, Kumar Bhupendra, Kumar Shailesh Ranjan, Kumar Manish, Paul Ashwarya Raj

Archives of Thermodynamics

2024

Vol. 45, no. 4

37--44

The ongoing trend of miniaturization of electronic devices, including computer processors, high-speed servers and micro-electromechanical system devices, should go hand in hand with their improved performance. However, managing heat remains a major challenge for these devices. In the present study, a numerical investigation was done on a micro-channel heat sink with an openstepped micro-pin fin heat sink with various arrangements through ANSYS software. Pin fin was varied in a fashion of increasing and decreasing. The working fluid opted for was water in a single phase. The analysis takes into account varying thermo-physical properties of water. The operating parameters, i.e. the Reynolds number was taken as 100–350 and heat flux as 500 kW/m2 . Arrangements selected were staggered and inline. Observationsrevealed that the staggered 2 arrangement has shown better thermal performance than other arrangements within the entire investigated range of Reynolds numbers because of the effective mixing of fluids. Furthermore, the inline configuration of micro pin fin heat sink has the worst performance. It is interesting to note that a very small difference was observed in the heat transfer capability of both staggered configurations, while the pressure drop in the staggered 2 arrangement has shown an elevated value at a higher Reynold number value compared to the staggered 1 arrangement.

A comparative numerical evaluation of solar air heater performance having W-contoured, taper-contoured and reverse taper-contoured turbulators

Ghildyal Abhishek, Bisht Vijay Singh, Bhandari Prabhakar, Thapliyal Subham, Kaushik Shivasheesh, Ranakoti Lalit, Bangari Raghubeer Singh, Srivastava Ayushman, Kanojia Nikhil, Paul Ashwarya Raj

Archives of Thermodynamics

2024

Vol. 45, no. 4

189--196

The use of different turbulators in solar air heaters can significantly impact their thermal and hydraulic performance. This study compares solar air heaters equipped with W-contoured, taper-contoured, and reverse taper-contoured turbulators. It examines heat transfer coefficients, pressure drops, velocity contours, turbulent kinetic energy contours, and thermal perfor-mance factors for these systems under varying operating conditions. The air Reynolds number ranges from 4000 to 18 000, while design parameters such as relative roughness height and relative pitch ratio remain constant for accurate comparison. The simulations were conducted with a uniform heat flux of 1200 W/m2. The W-shaped contour roughness achieved the greatest heat transfer coefficient, surpassing both the tapered and reverse tapered configurations. In terms of friction factor, the tapered contour on the absorber plate led, followed by the reverse tapered and W-shaped contours. Overall, the W-shaped contour delivered the best performance. At lower Reynolds numbers, the reverse tapered contour outperformed the tapered contour, whereas at higher Reynolds numbers, the tapered contour showed superior performance compared to the reverse tapered contour.