Publicado 4 números por año
ISSN Imprimir: 2169-2785
ISSN En Línea: 2167-857X
Indexed in
HEAT TRANSFER AND CRISIS PHENOMENA AT BOILING OF REFRIGERANT FILMS FALLING DOWN THE SURFACES OBTAINED BY DEFORMATIONAL CUTTING
SINOPSIS
Determining the effective structures of heat-releasing surfaces that contribute to heat transfer enhancement and an increase in the critical heat flux values under various heat transfer conditions is of considerable scientific and practical interest. This paper presents the experimental results on heat transfer in the laminar-wave flow of a film with a mixture of R114/R21 refrigerants on three vertical cylinders with differently microstructured outer surfaces. It is shown that the heat transfer coefficients in the regime of boiling on surfaces with a microstructure of a smaller height and rib pitch exceed the values obtained for surfaces with larger characteristics. Surfaces with partially closed micropores (by knurling) in the regime of boiling have an advantage in heat transfer over microstructured surfaces without closed pores. All microstructured surfaces studied in this work demonstrated an increase in the values of the critical heat flux in comparison with a smooth surface.
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