気液環状二相流におけるじょう乱波と液滴の発生に及ぼす液粘性の影響(熱工学,内燃機関,動力など)

概要

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In order to clarify the effects of liquid viscosity on inception of disturbance waves and droplets, structure of gas-liquid interface and flow rates of droplets entrained with gas were measured simultaneously at five kinds of kinematic viscosities, 1.0, 3.2, 9.9, 30 and 70mm^2/s. Time-spatial traces of liquid film thickness measured by five holdup probes were presented and it was found that the inception of disturbance waves occurred at Re_l=200 or at the non-dimensional liquid film thickness of t_<fm>^+=6.5. Furthermore, entrainment ratios were measured and it was clarified that droplets occurred before the inception of disturbance waves with increasing liquid kinematic viscosity and the critical condition of the droplet inception was j_l=0.02-0.03m/s. The obtained results were compared with the published criteria on the inception of droplets and the previous correlations were found unsatisfactory. Considering the balance between shear force and surface tention acting on the wave crests, a new criterion of droplet inception was also proposed.
社団法人日本機械学会の論文
2006-07-25