Keywords

superhydrophobic, droplet, impingement, atomization, heat transfer, temperature jump length

Abstract

This paper presents an experimental study of drop impingement and thermal atomization on hydrophobic and superhydrophobic (SH) surfaces. Superhydrophobic surfaces having both microscale and nanoscale geometry are considered. Microscale SH surfaces are coated with a hydrophobic coating and exhibit micropillars and cavities which are classified using the surface solid fraction and center to center pitch. The solid fraction and pitch values explored in this study range from 0.05-1.0 and 8-60 μm respectively. Nanoscale textured surfaces are created by applying a blanket layer of carbon nanotubes. Both types of surfaces are further classified by a temperature jump length (λͲ). All experiments were conducted at We = 85. Results of atomization as a function of time for the impingement event are provided for several surfaces of varying surface geometry, surface temperature, and temperature jump length. Nanoscale SH surfaces are shown to completely suppress atomization at all conditions explored. Results of the maximum atomization that occurred on a given surface are also shown as a function of the surface temperature. The surface temperature at which the maximum atomization occurs varies with surface geometry. Further, the time after impact when the maximum atomization occurs is also a function of the SH surface parameters. In general, the maximum atomization magnitude and the surface temperature at which maximum atomization occurs each decrease with increasing λͲ. Further, the time when maximum atomization occurs increases with increasing λͲ.

Original Publication Citation

Lee, E., Maynes, D., Crockett, J., and Iverson, B. D., 2023, “Thermal atomization on superhydrophobic surfaces of varying temperature jump length,” International Journal of Heat and Mass Transfer, Vol. 216, p. 124587. DOI: 10.1016/j.ijheatmasstransfer.2023.124587

Document Type

Peer-Reviewed Article

Publication Date

2023-12-01

Publisher

ScienceDirect

Language

English

College

Ira A. Fulton College of Engineering

Department

Mechanical Engineering

University Standing at Time of Publication

Associate Professor

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