Improving the natural convective heat transfer of a rectangular heatsink using superhydrophobic walls: A numerical approach
Publish place: Energy Equipment and Systems، Vol: 6، Issue: 3
Publish Year: 1397
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_EES-6-3_005
تاریخ نمایه سازی: 11 خرداد 1398
Abstract:
The effect of utilizing superhydrophobic walls on improving the convective heat transfer in a rectangular heatsink has been studied numerically in this paper. The vertical walls were kept at isothermal hot-and-cold temperatures and horizontal walls were insulated. The boundary condition on the walls was: no-slip for regular, and slip (with slip length of 500 µm) for superhydrophobic walls. By changing the heatsink aspect ratio (AR, height/width) from 0.1 to 10, it was observed that regardless of the wall slip, the optimum AR is 1, i.e. square enclosure. For a square heatsink, using the nanofluid with = 3% could enhance the heat transfer (quantified by Nusselt number) by up to 9.8%. For the same enclosure filled with pure water, applying superhydrophobic horizontal walls could increase the heat transfer by 4.45%. The joint effect of using superhydrophobic walls and nano-particles enhanced the heat transfer by up to 14.75%. The results of this paper may open a new avenue for high performance cooling systems.
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Authors
Milad Shakeri Bonab
Department of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran
Abolfazl Anarjani Khosroshahi
Department of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran
Mehdi Ashjaee
Department of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran
Seyed Farshid Chini
Department of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran
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