2024/07/15(Mon) 10:30 -12:00 一樓演講廳 1F, Auditorium
Title
Universal direction in thermoosmosis of a near-critical binary fluid mixture
Speaker
藪中俊介博士 (日本原子能研究開發機構) Dr. Shunsuke Yabunaka (Advanced Science Research Center, Japan Atomic Energy Agency)Abstract
We consider thermoosmosis of a binary fluid mixture, which lies in the one-phase region near the demixing critical point, through a capillary tube, assuming preferential adsorption of one component onto the tube’s wall due to short-range-interactions. On the basis of a coarse-grained free-energy functional, we derive an expression of the thermal force density generated in the adsorption layer by a temperature gradient imposed along the tube. This expression is related to “local excess enthalpy”, as in Derjaguin and Sidorenkov’s formula for conventional thermoosmosis, originally derived for one-component fluids. Our results suggest that, if the mixture is near the upper (lower) consolute point, the flow direction is the same as (opposite to) the temperature gradient.
Language
演講語言 (Language): in English