A Study on the Hydraulic Loss of Tubular Coils

概要

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A knowledge of the hydraulic resistance for tubular coils is required in connection with heat exchangers. Motion of liquid in curved tube coils is greatly influenced by their configurations, namely, by the ratio of radius of tube to radius of curvature of tube d/D_1 and spiral pitch of the coils, and also Reynolds number R_e. To investigate these effects, flexible vinyl tubes reinforced by steel wires were employed to facilitate the experiments and the hydraulic loss of curved tube coils was measured for 3.43≦D_1/d≦51.2, 1.7°≦ pitch angle θ≦70゜, and 1.3×10^3≦R_e≦5×10^4. Flow patterns were also measured by a cylindrical Pitot tube. Except an extreme case of D_1/d=3.43, the hydraulic loss of coiled tubes can be estimated by modifying the results on curved tubes in one plane.
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