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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01 Jan 1970
237 citations
TL;DR: In this article, a single- nozzle spray cooling heat transfer mechanism with varying amounts of dissolved gas was investigated using two powerful techniques: time and space resolved heat transfer distributions produced by a single nozzle were measured using an array of individually controlled microheaters, while visualization and measurements of the liquid-solid contact area and the three phase contact line length were made using a total internal reflectance technique.
228 citations
TL;DR: In this article, experimental data for subcooled flow boiling of water at pressures from 105 to 3 bar, bulk liquid velocities ranging from 008 to 08 m/s, and subcooling from 10 to 30 K were presented.
227 citations
TL;DR: In this article, a mechanistic model has been developed for the wall heat flux partitioning during subcooled flow boiling, where the entire energy from the wall is first transferred to the superheated liquid layer adjacent to the wall, while the rest of this energy is utilized for sensible heating of the bulk liquid.
Abstract: In this work a mechanistic model has been developed for the wall heat flux partitioning during subcooled flow boiling. The premise of the proposed model is that the entire energy from the wall is first transferred to the superheated liquid layer adjacent to the wall. A fraction of this energy is then utilized for vapor generation, while the rest of the energy is utilized for sensible heating of the bulk liquid. The contribution of each of the mechanisms for transfer of heat to the liquid—forced convection and transient conduction, as well as the energy transport associated with vapor generation has been quantified in terms of nucleation site densities, bubble departure and lift-off diameters, bubble release frequency, flow parameters like velocity, inlet subcooling, wall superheat, and fluid and surface properties including system pressure. To support the model development, subcooled flow boiling experiments were conducted at pressures of 1.03 ‐3.2 bar for a wide range of mass fluxes ~124‐926 kg/m 2 s!, heat fluxes ~2.5‐90 W/cm 2 ! and for contact angles varying from 30° to 90°. The model developed shows that the transient conduction component can become the dominant mode of heat transfer at very high superheats and, hence, velocity does not have much effect at high superheats. This is particularly true when boiling approaches fully developed nucleate boiling. Also, the model developed allows prediction of the wall superheat as a function of the applied heat flux or axial distance along the flow direction. @DOI: 10.1115/1.1842784#
223 citations
TL;DR: In this paper, the authors identified three locations in the subcooled flow boiling region: the onset of nucleate boiling, the point of net vapor generation, and the location where x = 0 is attained from enthalpy balance equations.
Abstract: Subcooled flow boiling covers the region beginning from the location where the wall temperature exceeds the local liquid saturation temperature to the location where the thermodynamic quality reaches zero, corresponding to the saturated liquid state. Three locations in the subcooled flow have been identified by earlier investigators as the onset of nucleate boiling, the point of net vapor generation, and the location where x = 0 is attained from enthalpy balance equations. The heat transfer regions are identified as the single-phase heat transfer prior to ONB, partial boiling (PB), and fully developed boiling (FDB). A new region is identified here as the significant void flow (SVF) region. Available models for predicting the heat transfer coefficient in different regions are evaluated and new models are developed based on our current understanding
222 citations