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LOCAL HEAT TRANSFER COEFFICIENT IN WAVY FREE-FALLING TURBULENT LIQUID FILMS UNDERGOING UNIFORM SENSIBLE HEATING.

Author(s) : SHMERLER J. A., MUDAWWAR I.

Type of article: Article

Summary

THE FILM FLOW EXHIBITS RAPID THERMAL DEVELOPMENT IN THE ENTRAN CE REGION AND ENHANCED HEAT TRANSFER OVER THE LOWER PORTION OF THE HEATED LENGTH. A CORRELATION OF AN AVERAGED FULLY DEVELOPED HEAT TRANSFER COEFFICIENT IS PRESENTED AS A FUNCTION OF REYNOLDS AND PRANDTL NUMBERS. MEASUREMENTS WITHIN THE FILM SHOWED THE EXISTENCE OF A THERMAL BOUNDARY LAYER TYPICAL OF TURBULENT CHANNEL FLOW. NUMERICAL PREDICTIONS OF ENTRANCE AND FULLY DEVELOPED REGION HEAT TRANSFER COEFFICIENTS ARE COMPARED TO THE EXPERIMENTAL DATA. THE MODELS PREDICTED THE EXTENT OF THE DEVELOPMENT REGION BUT WERE NOT CAPABLE OF PREDICTING DOWNSTREAM ENHANCEMENT OF HEAT TRANSFER SINCE THEY DO NOT ACCOUNT FOR WAVE ACTIVITY AT THE FILM INTERFACE.

Details

  • Original title: LOCAL HEAT TRANSFER COEFFICIENT IN WAVY FREE-FALLING TURBULENT LIQUID FILMS UNDERGOING UNIFORM SENSIBLE HEATING.
  • Record ID : 1988-2256
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 31 - n. 1
  • Publication date: 1988

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