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- W128202343 abstract "The heat transfer between two fluids or between a fluid and a surface, during both single-phase and two-phase flow, is intimately linked to the geometrical characteristic of the heat transfer surface involved. Generally speaking, if the heat transfer area increases, the global heat transfer also increases, but if the surface is developed to improve heat transfer, the overall performance can be higher.Compact and efficient heat exchangers and heat sinks are more and more demanded for electronics cooling applications, refrigeration and air conditioning systems. For this reason, the development of new enhanced surfaces is a critical issue of thermal research.In this Ph. D. thesis, two arguments connected with enhanced heat transfer surfaces have been experimentally and analytically studied. In particular, the condensation of R410A inside a microfin tube and air forced convection through different enhanced surfaces have been analysed. With respect to two-phase flow, the heat transfer coefficients and the pressure drops during the condensation of R410A at 40 °C of saturation temperature inside a microfin tube have been measured. The experimental analysis have been carried out at the Dipartimento di Fisica Tecnica of the University of Padova.Using a database of 4000 experimental data points, a new correlation for the computation of the heat transfer coefficient during the condensation of several natural and synthetic refrigerants inside different enhanced microfinned tubes has been developed.With respect to single-phase flow, a new experimental test rig has been developed, designed and built at the laboratory of the Dipartimento di Fisica Tecnica of the University of Padova. This test rig allows to carry out accurate heat transfer and pressure drop measurements during air forced convection through different enhanced surfaces, such as traditional finned surfaces, metal foams and microgeometries, etc.The apparatus has been calibrated by testing a traditional finned surface for electronics cooling applications. Then, the heat transfer coefficients and the pressure drops during air forced convection through five different aluminum foams have been measured. All tested samples have been heated by imposing different heat fluxes, which have been varied between 150 W and 400 W. The experimental results have been compared with those obtained for the traditional finned surface." @default.
- W128202343 created "2016-06-24" @default.
- W128202343 creator A5029635931 @default.
- W128202343 date "2009-01-01" @default.
- W128202343 modified "2023-09-27" @default.
- W128202343 title "Scambio termico e fluidodinamica durante i deflussi bifase e monofase su superfici estese e in microgeometrieTwo-phase and single-phase heat transfer and fluid flow through enhanced surfaces and in microgeometries" @default.
- W128202343 hasPublicationYear "2009" @default.
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