同心二重管の環状部から内管への流れに関する研究 : 第1報, 損失ヘッドと流への可視化〔流体工学, 流体機械〕

概要

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I present the experimental data obtained using various types of concentric double pipes, in particular, the loss of total head through a turning flow region from the outlet of an annulus between the inner and the outer pipes to the inlet of the inner pipe. They are given in terms of a nondimensional clearance length L/d_i (L is the distance between the annulus outlet and bottom of the outer pipe and d_i is the inner diameter of the inner pipe) for various values of area ratio and Reynolds number. It should be noted that all curves of the cofficient of head loss plotted against L/d_i have the maximum value at about L/d_i=0.625 and the minimum value at about L/d_i=0.250 in the Re range from 4.4×10^3〜3.1×10^4. It was visually clarified that the increase of head loss against L/d_i=0.625 was due to the vortex.
一般社団法人日本機械学会の論文
1997-12-25