@article { author = {Shakeri Bonab, Milad and Anarjani Khosroshahi, Abolfazl and Ashjaee, Mehdi and Chini, Seyed Farshid}, title = {Improving the natural convective heat transfer of a rectangular heatsink using superhydrophobic walls: A numerical approach}, journal = {Energy Equipment and Systems}, volume = {6}, number = {3}, pages = {293-303}, year = {2018}, publisher = {University of Tehran}, issn = {2383-1111}, eissn = {2345-251X}, doi = {10.22059/ees.2018.32228}, 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.}, keywords = {Natural convection,Heatsink,Local Cooling,nanofluid,Superhydrophobic,Slip Length}, url = {https://www.energyequipsys.com/article_32228.html}, eprint = {https://www.energyequipsys.com/article_32228_acc9bef93b6eb70dd2c9841500682477.pdf} }