Abstract

Hydraulic losses in narrow (d/D = 0.895) annular channels with three fins wound helically on a central column were measured. For relative fin pitches of 3.5 <T/d <∞, the hydraulic losses under turbulent flow conditions are mainly determined by frictional losses at the channel walls, These losses may be calculated from the ordinary formulas for an annular channel without fins. An increase in the hydraulic resistance of the channel for a fixed liquid flow rate only becomes appreciable for small relative fin pitches (T/d<10). The data obtained for annular channels approximately coincide with measurements of hydraulic losses in staggered bundles of finned rods with S/d=1.05 in a longitudinal flow of heat carrier.

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