Free Energy Changes during Spherical Droplet Deposition—Mechanistic Model

On the basis of theoretical considerations (mechanistic model), an equation was determined that allowed to calculate the free energy (Helmholtz) of a spherical droplet deposited on a flat surface in a system without external forces. Assuming isochoric and isothermal transformation of the system and...

Full description

Saved in:
Bibliographic Details
Published inEnergies (Basel) Vol. 15; no. 13; p. 4725
Main Authors Michalski, Jacek A., Jakiela, Slawomir
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.07.2022
Subjects
Contact angle
droplet spreading
Droplets
Energy
Flat surfaces
Free energy
free energy of a droplet
Hypotheses
Thermodynamics
wetting
Online AccessGet full text

Cover

More Information
Summary:On the basis of theoretical considerations (mechanistic model), an equation was determined that allowed to calculate the free energy (Helmholtz) of a spherical droplet deposited on a flat surface in a system without external forces. Assuming isochoric and isothermal transformation of the system and a very fast conversion of mechanical energy into heat, the obtained equation allows to determine the trajectory of thermodynamic transformation consisting of the spreading of the droplet on the surface of the substrate. The similarities and differences in the behaviour of spherical droplets described by the mechanistic model and Young’s model, together with its improvements, were discussed. The trajectories of free energy changes during the spreading of droplets in a system in which the adhesive force acting perpendicular to the wetted surface was considered as well.
ISSN:1996-1073
1996-1073
DOI:10.3390/en15134725