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research-article

Experimental and Numerical Characterization of Drop Impact on a Hydrophobic Cylinder

[+] Author and Article Information
Javid Zohrabi Chakaneh

Graduate Student, Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
javid.zohrabi@yahoo.com

Seyed Javad Pishbin

Student, Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
Pb.javad74@gmail.com

Alireza Sheikhi Lotfabadi

Student, Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
Sheikhi.l.alireza@gmail.com

Mohammad Passandideh-Fard

Professor, Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
mpfard@um.ac.ir

1Corresponding author.

ASME doi:10.1115/1.4042666 History: Received June 23, 2018; Revised January 20, 2019

Abstract

In this paper, the impact of distilled water drops on hydrophobic cylinders is characterized using both experiments and numerical simulations. Water drops of 2.54mm in diameter impact with a velocity of 1m/s on hydrophobic cylinders. The corresponding Reynolds and Weber numbers are 2800 and 34, respectively. Three different stainless steel cylinders with diameters of 0.48 mm, 0.88mm and 1.62mm were used. The surfaces of the cylinders were made hydrophobic using a special coating spray. An experimental setup consisting of a drop generator, a high speed camera, a lighting system and a photoelectric sensor was used to capture images of the impact with a time step of 1ms. The images were then analyzed using an image processing technique implemented in the MATLAB software. Both the centric and off-centric impacts were studied for each cylinder diameter. A numerical simulation of the impact was also obtained using an open-source code called OpenFOAM by employing its InterFoam solver. The numerical scheme used by the solver is the volume-of-fluid (VOF) method. The predicted images of the simulations were compared well with those of the captured photographs both qualitatively and quantitatively for the entire experiments. The behavior of the drop after the impact and the subsequent deformation on hydrophobic cylinders including flow instabilities, liquid breakup and secondary drops formation were observed from both simulations and experiments. By decreasing the cylinder diameter, the breakup occurs sooner and a smaller number of secondary drops are formed.

Copyright (c) 2019 by ASME
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