TY - JOUR
T1 - A molecular dynamics study of heat transfer over an ultra-thin liquid film with surfactant between solid surfaces
AU - Guo, Yuting
AU - Surblys, Donatas
AU - Kawagoe, Yoshiaki
AU - Matsubara, Hiroki
AU - Ohara, Taku
N1 - Funding Information:
This work was supported by JST CREST Grant No. JPMJCR17I2, Japan. Numerical simulations were performed on the Supercomputer system “AFI-NITY” at the Advanced Fluid Information Research Center, Institute of Fluid Science, Tohoku University.
Publisher Copyright:
© 2019 Author(s).
PY - 2019/11/14
Y1 - 2019/11/14
N2 - Using molecular dynamics simulation, we investigated the mechanism by which the intercalation of a surfactant solution reduces the contact thermal resistance of two solid surfaces. We constructed a model system where two solid surfaces with a gap were immersed in a surfactant solution, and the gap was filled with permeating molecules to form a molecular thin film. By varying the concentration of the surfactant and the distance between the confining surfaces, factors affecting the intersolid heat transfer were explored. It was demonstrated that the overall thermal resistance of the present system was determined by interfacial thermal resistance between the solid and the solution and can be reduced by increasing the surfactant concentration. The surface separation, i.e., the distance between the two solid surfaces, had a significant impact on interfacial thermal resistance, whether or not surfactant molecules were involved. Interfacial thermal resistance was an oscillatory function of the surface separation and displayed minimum values not at the most adsorption amount of liquid molecules but when the density profile of liquid molecules showed a sharp peak, i.e., when the surface separation was commensurable with the size of the solvent molecule. This tendency was most remarkably seen when the liquid film was composed of a single molecular layer. The findings in this study provide helpful insights into the reduction of interfacial thermal resistance utilizing surfactant solutions.
AB - Using molecular dynamics simulation, we investigated the mechanism by which the intercalation of a surfactant solution reduces the contact thermal resistance of two solid surfaces. We constructed a model system where two solid surfaces with a gap were immersed in a surfactant solution, and the gap was filled with permeating molecules to form a molecular thin film. By varying the concentration of the surfactant and the distance between the confining surfaces, factors affecting the intersolid heat transfer were explored. It was demonstrated that the overall thermal resistance of the present system was determined by interfacial thermal resistance between the solid and the solution and can be reduced by increasing the surfactant concentration. The surface separation, i.e., the distance between the two solid surfaces, had a significant impact on interfacial thermal resistance, whether or not surfactant molecules were involved. Interfacial thermal resistance was an oscillatory function of the surface separation and displayed minimum values not at the most adsorption amount of liquid molecules but when the density profile of liquid molecules showed a sharp peak, i.e., when the surface separation was commensurable with the size of the solvent molecule. This tendency was most remarkably seen when the liquid film was composed of a single molecular layer. The findings in this study provide helpful insights into the reduction of interfacial thermal resistance utilizing surfactant solutions.
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U2 - 10.1063/1.5123583
DO - 10.1063/1.5123583
M3 - Article
AN - SCOPUS:85074970046
SN - 0021-8979
VL - 126
JO - Journal of Applied Physics
JF - Journal of Applied Physics
IS - 18
M1 - 185302
ER -