A PRELIMINARY INVESTIGATION OF AIR FILM HEAT-TRANSFER COEFFICIENTS FOR FREE- AND FORCED-VORTEX FLOW WITHIN TUBES
- 23 May 1958
- report
- Published by Office of Scientific and Technical Information (OSTI)
Abstract
The results of an experimental investigation of heat transfer to a high velocity, vortex air flow are presented. Heat-transfer coefficients have been observed for vortex flow in tubes which are larger thaa those for linear turbulent flow at a given flow power dlssipation per unit surface area. Comparisons are drawn between air in free- and forced-vortec flow within tubes having length-to-diameter ratios of 11.7 and 20.0, respectively. and linear turbulent flow in identical tubes. For the observed range of flow power disslpation, the freevortex flow system is characterized by a heat-transfer coefficieut one to two hundred per cent larger than that calculated for linear turbuleut flow at the same pumping power. The forced-vortex flow system exhibits a superiority over linear flow only at high flow powers. (auth)Keywords
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