@Article{icces.2023.09318,
AUTHOR = {Xudong Chen, Quanzi Yuan},
TITLE = {The Instability Mechanism of Moving Contact Line on the Surface of  Soluble Solids},
JOURNAL = {The International Conference on Computational \& Experimental Engineering and Sciences},
VOLUME = {27},
YEAR = {2023},
NUMBER = {4},
PAGES = {1--1},
URL = {http://www.techscience.com/icces/v27n4/55220},
ISSN = {1933-2815},
ABSTRACT = {The wetting and instability of liquids on the surface of soluble solids is a problem of interface stability at 
multiple scales, which is coupled by mechanics and chemistry. This problem is crucial to application fields 
such as micro-nano processing and microscopic observation. In this work, the instability process of moving 
contact lines on the surfaces of soluble solids is investigated in experiments, theories, and simulations. Based 
on the unique shapes of the surfaces of soluble solids caused by instability in experiments, the concept of 
pagoda instability is proposed. Then the Cahn-Hilliard interfaces are developed to establish the evolution 
model of solid-liquid and liquid-gas interfaces in the instability process, obtaining the mathematical 
expressions of the final shapes of soluble solids. The stability of the liquid-gas interfaces and the evolution 
of capillary forces are analyzed when the dissolved shapes are characterized by power functions, revealing 
that the unique shapes caused by instability can effectively eliminate capillary adhesion. Furthermore, the 
key role of contact angle hysteresis in this problem is introduced to the developed Cahn-Hilliard interface 
theory. The effect of contact angle hysteresis on the solid-liquid and liquid-gas interfaces during the 
dissolution process is analyzed to clarify the mechanism of the formation of pagoda instability, which is in 
great agreement with the experiment results. It is hoped that the control of the instability process of the 
moving contact line in the experiments with the help of the theoretical model will guide for the relevant 
design of shapes in practical applications.},
DOI = {10.32604/icces.2023.09318}
}