接触角の履歴現象に及ぼす残留気泡・液滴の影響 : 熱工学,内燃機関,動力など

概要

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The residual bubble or liquid drop formed while the three-phase contact line moves on the solid surface with steep roughness has an important effect on the contact angle hysteresis. Based on the condition of system equilibrium proposed in the preceding report, the energy change is theoretically calculated for the movement of the three-phase contact line on a surface with two-dimensional saw-tooth roughness. The energy change is contributed from the wetting of the surface and also from the formation of liquid-gas interface of residual bubble or drop. The result shows that the macroscopic contact angle ; i. e., the advancing and receding contact angles, are determined by the same condition as those when the residual bubble or drop are not formed. The maximum inclination of the roughness influences the hysteresis of the contact angle. The numerical calculation of the energy change for the roughness with arbitrary shape gives the same result as stated above.
2001-07-25