FLUID FRICTION AND BOILING MEAT TRANSFER WITH WATER IN VORTEX FLOW IN TUBES CONTAINING AN INTERNAL TWISTED TAPE

摘要

The problems of fluid friction and boiling heat transfer from a tube to water in vortex flow arc considered. The vortex is promoted and main¬tained by an internal twisted ribbon. Twist ratios, V, of 2, 4, and 6 are utilized.nFriction factors arc measured for straight flow and vortex flow for Reynolds Numbers from 60,000 to 400,000.nA comparison between maximum operating heat fluxes obtainable in straight flow and vortex flow is made on the basis of pumping power. Under certain conditions vortex flow can exhibit a two-to-one advantage over straight flow. Under other conditions, however, vortex flow may possess little or no advantage.nTube wall temperatures in the nucleate boiling regime are measured for the same fluid conditions as the burnout measurements.