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 distribution parameter and drift velocity constitutive equations for subcooled boiling flow in a sub-channel of rod bundle geometry were derived from the bubble-layer thickness model.
50 citations
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TL;DR: In this paper, the authors present the results of using known correlations for boiling heat transfer in a minichannel 1mm deep, 40mm wide and 360mm long, with three spatial orientations: vertical, position 90° and two horizontal orientations, positions 0° and 180°.
50 citations
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TL;DR: In this paper, a subcooled flow boiling heat transfer of water was carried out experimentally in a uniformly heated vertical circular tube with an inner diameter of 90mm under HHHM conditions.
50 citations
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TL;DR: In this article, external condensation heat transfer coefficients (HTCs) of HFC134a and R1234yf were measured on a plain, low fin, and Turbo-C tubes at the saturated vapor temperature of 39°C with the wall subcooling of 3-8°C.
Abstract: In this study, external condensation heat transfer coefficients (HTCs) of HFC134a and R1234yf are measured on a plain, low fin, and Turbo-C tubes at the saturated vapor temperature of 39 °C with the wall subcooling of 3–8 °C. R1234yf is a new alternative refrigerant of low greenhouse warming potential for replacing HFC134a, one of the greenhouse gases in Kyoto protocol, used extensively in automobile air conditioners and other refrigeration systems. Test results show that the condensation HTCs of R1234yf are very similar to those of HFC134a for all three surfaces tested. For the development of heat transfer correlations, thorough property measurements are needed for R1234yf in the near future.
50 citations
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TL;DR: In this paper, the effect of plate motion on heat transfer in the film boiling regime was investigated and the importance of radiation heat transfer across the vapor layer was shown to be low even at low plate temperatures.
Abstract: The growth in demand for high-quality metallic alloys has placed greater emphasis on the predictability of cooling methods used in manufacturing processes. Several methods involve forced convection film boiling, which can occur on metallic strips or plates cooled by water jet impingement or on strips inside cooling jackets of continuous annealing processes. Since surface temperatures are typically well above the boiling point of water, a substantial portion of the surface area can involve film boiling. The strip or plate speed often exceeds the water velocities and strongly influences boundary layer development in the vapor and liquid. The purpose of this paper is to estimate the effect of plate motion on heat transfer in the film boiling regime. Conservation equations for mass, momentum, and energy have been solved by the integral method for film boiling in forced convection boundary layer flow on a flat isothermal plate in motion parallel to the flow direction. Unlike previous studies, which have shown that heat transfer is chiefly governed by the plate and subcooled liquid temperatures, heat transfer is shown to also depend on the plate velocity. For large velocities, the importance of radiation heat transfer across the vapor layer is reduced. However, when themore » velocities of the plate and liquid are oppositely directed and of nearly equal magnitude, radiation across the vapor layer can become significant, even at low plate temperatures.« less
49 citations