Abstract
When a fluid flows through a curved pipe, there exists a secondary flow. and the frictional resistance increases considerably compared to that of a straight pipe. The friction factors of curved pipes have been studied by many investigators theoretically and experimentally, but literature on three-dimensional coiled pipes is seldom found and there still remains an unexplored domain. The purpose of this paper is to present results of measurements of the hydraulic losses for flow through such tubular coils wound continously in a figure 8. Consequently, it is confirmed that the friction factors in coils λn decrease with the increase of the number of turns of coils n, and the flow in coils comes to a saturated state in the first seven turns of the coils.
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