同心二重管の環状部から内管への流れに関する研究 : 損失ヘッドとその軽減

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The present paper deals with a fluid flow issuing from an annulus and turning back into an inner pipe. I present the experimental data using various types of concentric double pipes, in particularly, giving the loss of total head through a turning flow region from the annulus to the inner pipe. They are given in terms of a nondimensional clearance length L/d_1 (L is the distance between the annulus outlet and the outer pipe bottom and d_1 is the inner diameter of the inner pipe) for various values of area ratio and Reynolds number. It should noted that curves of coefficient of head loss against L/d_1 have the maximum value about L/d_1=0.625 for A_r=1.28 in the range from Re=4.4×10^3 to 3.1×10^4 and the maximum value about L/d_1=1.00 for A_r=3.38. Thus, L/d_1 against the maximum value of head loss changes with a area ratio increase. It became clear by the means of visualization that the increase of head loss against L/d_1 was caused by the vortex. Still due to the plate attached to the inner pipe inlet, the head loss for the clearance length ratio L/d_1=0.625 decreases.
一般社団法人日本機械学会の論文
1998-09-25