長い水平管内の環状噴霧流における諸量の軸方向変化および非整定区間長さ : ノズル給水およびシンタ給水の比較

概要

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An air-water annular mist flow has been studied experimentally using a long horizontal pipe of about 30 mm diameter and 24.5m long, for two extreme cases of the air-water mixing devices, a porous wall and a nozzle installed along the pipe axis. It was observed that the flow patterns and the onset of the large disturbance wave were remarkably influenced by the mixing device. In the case of nozzle mixing, the total flow rate of dispersed water G_<le> did not axially decrease and became a minimum and then turned to increase monotonously, attaining a certain constant value, whereas in the porous wall mixing it increased monotonously and attained a constant value. The non-equilibrium length (x/d)_φ decided by the axial change of G_<le> was not so remarkably different between both mixing devices. The value of (x/d)_φ was at least 400 in the range of the air velocity u_<go>≧52.1m/s and the liquid Reynolds number R_<elo>≧484.
社団法人日本機械学会の論文
1984-10-25