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Showing 1 to 10 of 10 for “"heat flux partitioning"”.
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Experimental study of heat flux partitioning in pressurized subcooled flow boiling
… of subcooled flow boiling and the critical heat flux (CHF) is of the utmost importance for both safety and profitability of pressurized water nuclear reactors since they are major factors in the determination of the reactor power rating. Motivated by the emergence of a new wall boiling model …
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Development and assessment of a physics-based model for subcooled flow boiling with application to CFD
Boiling is an extremely efficient mode of heat transfer and is the preferred heat removal mechanism in power systems in general and, more recently, in electronics cooling. Physics-based models that describe boiling heat transfer, when coupled with Computational Fluid Dynamics (CFD), can be an …
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Experimental Investigation of Subcooled Flow Boiling and CHF at Prototypical Pressures of Light Water Reactors
… with accurate models of nucleate flow boiling heat transfer. High-resolution, in situ experiments performed at prototypical pressures of light water reactors (LWRs) are needed in order to elucidate the phenomenon of the boiling crisis and to inform the development of boiling models suitable for …
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Infrared Thermometry Analysis of Surface Effects in Subcooled and Saturated Boiling of Water
… Utilizing specially crafted thin-film infrared heaters, we measured bubble dynamics parameters and correlated them with surface properties. Nano-smooth and rough surfaces, comparable to nuclear reactor fuel claddings, were examined, and a nanoporous layer was applied to mimic fouling, enabling a …
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Advancing State-of-the-art Multiphase CFD Modeling for PWR Applications
… Eleven test cases at various flow conditions, heat flux, inlet subcooling, and pressure have been used in this systematic validation. This work leverages advancements in momentum closures to perform a systematic assessment of wall boiling representation by evaluating heat flux partitioning …
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Investigation of Separate Effects of Surface Condition on Subcooled Flow Boiling Heat Transfer
In Pressurized Water Reactor (PWRs), heat generated by nuclear fissions is effectively transferred to the water coolant by subcooled flow boiling. The maximum reactor power is limited by the critical heat flux (CHF), at which the boiling crisis occurs. Understanding the mechanisms that trigger this …
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Synthesis of CRUD and its effects on pool and subcooled flow boiling
… deposition may have large effects on critical heat flux (CHF) and heat transfer coefficient (HTC). An investigation of such effects was conducted as part of the CASL project by creating well-defined and characterized synthetic CRUD with parameters representative of reactor CRUD on indium tin …
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High-Resolution Experimental Measurements and Mechanistic Modelling of Saturated Cryogenic Pool Boiling Heat Transfer
… them prone to boil when transferred through superheated pipes, or simply stored in fuel tanks, resulting in the presence of two-phase mixture. Boil-off gas can lead to pressurization of components like fuel line and tanks, cause two-phase flow instabilities during fuel transfer, or significantly …
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Geometric and numerical optimisation of single- and two-phase convective heat transfer in microchannel heat sinks
… are required for the present and future high heat flux applications because natural and forced air convection and many other cooling methods employing liquid coolants cannot meet up with the challenges. More transistors are added to the surfaces of electronic chips to increase the capacity of …
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Quantification of the Fire Thermal Boundary Condition
… exposed surface was quantified with a hybrid heat flux gage. Methods were developed to determine the net heat flux through the gage, incident heat flux, cold surface heat flux, convective heat transfer coefficient, adiabatic surface temperature, and the separated components of radiative and …