Abstract
The Concentric Double Pipe is constructed from two pipes with one end of the inner pipe (inner diameter di) reaching to within a distance L from the sealed end of the outer pipe (inner diameter Di). The sealed end of the outer pipe is constructed from the cap with a curvature (a curvature radius ratio R/Di, R : a curvature radius) or the plate cap (R/Di=0). The present paper deals both with a fluid flow issuing from an annulus and turning back into the inner pipe (it is called suction flow). We report the experimental data giving the total head loss through a turning flow region from the end of the inner pipe to the bottom of the outer pipe for two area ratio Ar=0.567, 2.26 (Ar is defined as the cross-section area of the annulus divided by that of the inner pipe) and Reynolds number (Re=4.8×103∼3.6×104). The head loss of the cap with the curvature is bigger fairly than that of the plate cap in the range taking the maximum value of the head loss, where the head loss of the cap with the cone is smaller fairly than those of the other caps.
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