A PRELIMINARY INVESTIGATION OF AIR FILM HEAT-TRANSFER COEFFICIENTS FOR FREE- AND FORCED-VORTEX FLOW WITHIN TUBES

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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 ... continued below

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Pages: 15

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Greene, N.D. & Gambill, W.R. May 23, 1958.

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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)

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Pages: 15

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  • Other Information: Orig. Receipt Date: 31-DEC-58

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  • Report No.: CF-58-5-67
  • Grant Number: W-7405-ENG-26
  • DOI: 10.2172/4336045 | External Link
  • Office of Scientific & Technical Information Report Number: 4336045
  • Archival Resource Key: ark:/67531/metadc1016190

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  • May 23, 1958

Added to The UNT Digital Library

  • Oct. 15, 2017, 10:09 p.m.

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  • Oct. 23, 2017, 1:53 p.m.

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Greene, N.D. & Gambill, W.R. A PRELIMINARY INVESTIGATION OF AIR FILM HEAT-TRANSFER COEFFICIENTS FOR FREE- AND FORCED-VORTEX FLOW WITHIN TUBES, report, May 23, 1958; Oak Ridge, Tennessee. (digital.library.unt.edu/ark:/67531/metadc1016190/: accessed June 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.