Topic
Subcooling
About: Subcooling is a research topic. Over the lifetime, 6150 publications have been published within this topic receiving 99125 citations.
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TL;DR: In this paper, the dimensionless velocity component method is applied to transform the governing equations and its boundary conditions, instead of the traditional Falkner-Skan transformation, and a temperature parameter method and a polynomial approach are used to treat variable thermophysical properties both for vapour and liquid films, respectively.
32 citations
TL;DR: In this paper, an electrically heated stainless steel tube was used to study the incipience of flow boiling in subcooled, well-wetting fluids (R-12 and R-114) over a wide range of pressure, mass flux, and heat flux.
Abstract: An electrically heated stainless steel tube was used to study the incipience of flow boiling in subcooled, well-wetting fluids (R-12 and R-114) over a wide range of pressure, mass flux, and heat flux. Some existing correlations were tested. Classic theory on bubble growth, heat transfer relationships, and the force balance equation at the bubble-liquid interface, coupled with an empirical correlation for the determination of the boiling incipience conditions accomplish a successful prediction of the experimental data
32 citations
TL;DR: In this article, a series of melting experiments with a moving horizontal cylindrical heat source at constant surface heat flux have been performed, where the heat source was designed in such a way that it could descend under its weight while melting the phase-change material (n-octadecane) surrounding it.
Abstract: A series of melting experiments with a moving horizontal cylindrical heat source at constant surface heat flux have been performed. The heat source was designed in such a way that it could descend under its weight while melting the phase-change material (n-octadecane) surrounding it. The heat-source velocity was measured and the motion and shape of the solid–liquid interface were determined photographically. The effects of the surface heat flux, the density and initial position of the heat source, and the initial subcooling of the solid were investigated and are discussed. Conduction was found to be the dominant heat-transfer mechanism around the lower stagnation point and controlled the terminal velocity of the source. The fluid motion in the melt pool above the heat source was mainly induced by the descent of the source, while natural convection played only a relatively minor role in the motion.
32 citations
TL;DR: In this article, the authors performed 10 pure steam experiments in the range of steam mass flux 5-80 kg/m2) and water temperature 19-96 ǫ°C and found that steam condensation behave, fluid oscillation and pressure oscillation are recorded and analyzed.
32 citations
TL;DR: In this paper, the external condensation heat transfer coefficients (HTCs) of six flammable refrigerants of propylene (R1270), propane (R290), isobutane, R600a, butane, dimethylether (RE170), and HFC32 were measured at the vapor temperature of 39°C on a plain tube of 19.0 mm outside diameter with a wall subcooling of 3-8°C under a heat flux of 7-23 kW m −2.
Abstract: In this study, external condensation heat transfer coefficients (HTCs) of six flammable refrigerants of propylene (R1270), propane (R290), isobutane (R600a), butane (R600), dimethylether (RE170), and HFC32 were measured at the vapor temperature of 39 °C on a plain tube of 19.0 mm outside diameter with a wall subcooling of 3–8 °C under a heat flux of 7–23 kW m −2 . Test results showed a typical trend that external condensation HTCs decrease with the wall subcooling. No unusual behavior or phenomenon was observed for these flammable refrigerants during experiments. HFC32 and DME showed 28–44% higher HTCs than those of HCFC22 due to their excellent thermophysical properties. Propylene and butane showed the similar HTCs as those of HCFC22 while propane and isobutane showed 9% lower HTCs than those of HCFC22. Finally, a general correlation was made by modifying Nusselt's equation based upon the measured data of eleven fluids of various vapor pressures including halogenated refrigerants. The general equation showed an excellent agreement with all data exhibiting a deviation of less than 3%.
32 citations