矩形ミニ流路内気液二相流の流動特性に及ぼす濡れ性の影響

抄録

Experiments were conducted for air-water two-phase flow using a horizontal rectangular mini-channel having hydraulic diameter of D_H = 3.2 mm. In order to know the effects of the channel wall surface wettability on the two-phase flows, the wettability on the test section was changed by coating the hydrophobic agent. The contact angles, θ_a, were approximately 80° for the wall surface without coating and 115° for one with coating. In the present experiments, flow pattern, bubble length and pressure drop were measured. The experimental results for coating and non-coating cases were compared each other. From the comparison, it found that surface with the coating makes bubbles length longer, and for the coating case the frictional pressure drop is smaller than the non-coating one.