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research-article

Heat Transfer Enhancement Incorporating Fins-Like Structures inside Droplet on Hydrophobic Surface

[+] Author and Article Information
Abdullah Al-Sharafi

Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
alsharafi@kfupm.edu.sa

Bekir Sami Yilbas

Department of Mechanical Engineering & Centre of Excellence for Renewable Energy, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
bsyilbas@kfupm.edu.sa

Abdullah A. AlZahrani

Clean Energy Research Lab (CERL), University of Ontario Institute of Technology, Canada
abdullah.alzahrani@uoit.ca

1Corresponding author.

ASME doi:10.1115/1.4042771 History: Received December 30, 2017; Revised January 22, 2019

Abstract

Enhancement of droplet heat transfer on a hydrophobic surface is examined via introducing the fins-like structures inside the droplet without altering the wetting state of the surface. A solution crystallization of polycarbonate surface is carried out and the functionalized silica particles are deposited onto the crystallized surface to create the hydrophobic surface characteristics. The ferrous particles (Fe2O3) are locally spread onto the hydrophobic surface and, later, manipulated by an external magneto-static force generating various configurations of fins-like structures inside the droplet. The droplet with fins-like structures is heated from the hydrophobic surface through introducing a constant temperature heat source. Flow and temperature fields inside the droplet are simulated in line with the experimental conditions. It is found that changing the configuration of the fins-like structures in the droplet modifies significantly the flow and temperature fields inside the droplet. The Bond number remains less than unity for all configurations of the fins-like structures while demonstrating the importance of the Marangoni current over the buoyancy current in the flow field. The presence of the fins-like structures lowers the difference between the fluid bulk and the minimum temperatures inside the droplet and improves considerably the heat transfer rates and the Nusselt number.

Copyright (c) 2019 by ASME
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