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Lateral retention of water droplets on solid surfaces without gravitational effect

Published online by Cambridge University Press:  05 June 2020

Sirui Tang ,
Chun-Wei Yao Open the ORCID record for Chun-Wei Yao [Opens in a new window] ,
Rafael Tadmor  and
Divine Sebastian
Sirui Tang
Affiliation:
Dan F. Smith Department of Chemical Engineering, Lamar University, Beaumont, TX77710, USA
Chun-Wei Yao*
Affiliation:
Department of Mechanical Engineering, Lamar University, Beaumont, TX77710, USA
Rafael Tadmor
Affiliation:
Dan F. Smith Department of Chemical Engineering, Lamar University, Beaumont, TX77710, USA Department of Mechanical Engineering, Ben Gurion University of the Negev, Beer Sheva8410501, Israel
Divine Sebastian
Affiliation:
Department of Mechanical Engineering, Lamar University, Beaumont, TX77710, USA
*
Address all correspondence to Chun-Wei Yao at cyao@lamar.edu
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Abstract

Gravity is commonly considered negligible when the surface tension is dominant; i.e., the Bond number is less than 1. In this paper, however, the authors present a technique in which drops slide over surfaces with zero effective gravity. Our study compared the sliding motion of water drops on hydrophilic and hydrophobic surfaces in scenarios: one in which effective gravity = 1 (1 g) and one in which it = 0 (0 g). The authors found that the lateral retention force was greater under 1 g than it was under 0 g. Also, the results showed that retention forces calculated by Furmidge equation are higher than the measured forces.

Type
Research Letters
Information
MRS Communications , Volume 10 , Issue 3 , September 2020 , pp. 449 - 454
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Copyright
Copyright © Materials Research Society, 2020

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