下向き環状噴霧流における液膜および液滴の挙動 : シンク給水およびノズル給水の比較

概要

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An air-water downward annular mist flow has been studied experimentally using a vertical pipe of about 30 mm in diameter and 6.5 m long, under the two extreme conditions of air-water mixing by using a porous wall and a nozzle installed along the pipe axis. It was observed that the film formation and the onset of large disturbance waves were remarkably influenced by the mixing manner. In the case of the nozzle mixing, the total flow rate of dispersed water G_<le> axially decreased monotonously and attained a certain constant value ; whereas, in the case of the porous wall mixing, it increased monotonously and attained a constant value. For high air velocity and high water velocity, the non-equilibrium lengths (x/d)ψ decided by the axial change of the dispersed water droplets ratio ψ were 70 ~ 140, and not so remarkably different between both mixing methods. Furthermore, some liquid film characteristics connecting the dispersed liquid droplets, such as film thickness, wave velocity and the frequency of large disturbance waves, were clarified between the two mixing methods.
社団法人日本機械学会の論文
1986-07-25