Experimental and Three-Dimensional Numerical Study of the Single/Multiple Sessile Droplets Evaporation

Abstract

In this work, a three-dimensional numerical simulation, accompanied by an experimental study, of the evaporation of one or more nonaligned liquid droplets deposited on a solid substrate and surrounded by air was produced. In addition to the central droplet, the behavior of other neighboring droplets was tracked. Evaporation of a single droplet S was compared with that of multiple droplets (a droplet C surrounded by four nonaligned droplets). The shielding effect exerted by the four droplets on the droplet C increases the life of the latter by 83% as compared to a single droplet. Evaporated flow of the droplet C is reduced by 58% compared to the case of the isolated droplet S. The droplets at the extremities evaporate faster (compared to the droplet C, the evaporated volume can increase up to 57%), since they have less interaction with nearby droplets. A geometric coefficient F characterizing the ratio of the distance separating two neighboring droplets, to the diameter of a droplet was introduced. The shielding effect decreases with the increase of F. For F greater than 5, the behavior of the extremity droplets tends toward that of a single droplet.

Additional information

Notes on contributors

Walid Foudhil

Walid Foudhil is an Assistant Professor of Physics in the Faculty of Sciences of Bizerta Tunisia. He received his Ph.D. degree from Faculty of Sciences of Tunis. His research contributions have been in the field of heat and mass transfer. He is currently working on numerical and experimental studies of phase change material and the droplet and spray evaporation.

Dorra Khilifi

Dorra Khilifi is currently in postdoctoral position at the LAMIH laboratory at Hauts-de-France University in Valenciennes France. She obtained her Ph.D. degree from the Faculty of Sciences of Tunis. Her research contributions have been in the field of heat and mass transfer. She is currently working on the evaporation of the sessile liquid droplet.

Yvan Dutil

Yvan Dutil is an astrophysicist. He is a member of the Division F Planetary Systems and Astrobiology of the International Astronomical Union and of the Standing Committee on Extra-terrestrial Intelligence Research of the International Academy of Astronautics. He is now working on radioprotection regulation topic for the Quebec government.

Souad Harmand

Souad Harmand is a Professor at the University of Valenciennes, France. She graduated from the Engineering School Ecole des Mines and received her Ph.D. from the University of Valenciennes. Her research area is strongly focused on the convective heat transfer on rotating systems and on the heat and mass transfer in heat pipes. She is currently working on the optimization of the cooling of electrical components as well as the enhancement of the evaporation of nanofluids.

Sadok Ben Jabrallah

Sadok Ben Jabrallah is a Professor at the Faculty of Sciences of Bizerta Tunisia. He has a wide knowledge and a long experience in (renewable) energy, building thermal and desalination. He also has training and experience in quality management and metrology. His research contributions have been in the field of heat and mass transfer. He is currently working on phase change materials and on droplet and film evaporation.