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Comparitive study of heat transfer and pressure drop during flow boiling and flow condensation in minichannels

Abstrakt

In the paper a method developed earlier by authors is applied to calculations of pressure drop and heat transfer coefficient for flow boiling and also flow condensation for some recent data collected from literature for such fluids as R404a, R600a, R290, R32,R134a, R1234yf and other. The modification of interface shear stresses between flow boiling and flow condensation in annular flow structure are considered through incorporation of the so called blowing parameter. The shear stress between vapor phase and liquid phase is generally a function of non-isothermal effects. The mechanism of modification of shear stresses at the vapor-liquid interface has been presented in detail. In case of annular flow it contributes to thickening and thinning of the liquid film, which corresponds to condensation and boiling respectively. There is also a different influence of heat flux on the modification of shear stress in the bubbly flow structure, where it affects bubble nucleation. In that case the effect of applied heat flux is considered. As a result a modified form of the two-phase flow multiplier is obtained, in which the non-adiabatic effect is clearly pronounced.

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Kategoria:
Publikacja w czasopiśmie
Typ:
artykuły w czasopismach recenzowanych i innych wydawnictwach ciągłych
Opublikowano w:
Archives of Thermodynamics strony 17 - 37,
ISSN: 1231-0956
Język:
angielski
Rok wydania:
2014
Opis bibliograficzny:
Mikielewicz D., Andrzejczyk R., Jakubowska B., Mikielewicz J.: Comparitive study of heat transfer and pressure drop during flow boiling and flow condensation in minichannels// Archives of Thermodynamics. -., (2014), s.17-37
Weryfikacja:
Politechnika Gdańska

wyświetlono 30 razy

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