0
research-article

Heat transfer and fluid flow characteristics in a sessile droplet on oil impregnated surface under thermal disturbance

[+] 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

Haider Ali

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

1Corresponding author.

ASME doi:10.1115/1.4036388 History: Received November 19, 2016; Revised March 31, 2017

Abstract

The present study examines the flow filed and heat transfer inside a sessile droplet on oil impregnated surface when subjected to a small temperature disturbance at the droplet-oil interface. Temperature and flow fields inside the droplet are predicted and the flow velocities predicted are validated through the data obtained from a Particle image velocimetry. Several images of droplets in varying sizes are analyzed and the droplet geometric features and experimental conditions are incorporated in the simulations. A polycarbonate wafer is used to texture the surface via incorporating a solvent induced crystallization method. Silicon oil is used for impregnation of the textured surfaces. It is found that two counter rotating circulation cells are formed in the droplet because of the combine effect of the Maragoni and buoyant currents on the flow field. A new dimensionless number (Merve number) is introduced to assess the behavior of the Nusselt and the Bond numbers with the droplet size. The Merve number represents the ratio of the gravitational force over the surface tension force associated with the sessile droplet and it differs than the Weber number. The Nusselt number demonstrates three distinct behaviors with the Merve number; in which case, the Nusselt number increases sharply for the range 0.8 ? MN ? 1. The Bond number increases with increasing the Merve number, provided that its values remain less than unity, which indicates the Marangoni current is dominant in the flow field.

Copyright (c) 2017 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In