Global ETD Search
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Showing 1 to 8 of 8 for “"Deteriorated heat transfer"”.
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Specifics of forced-convective heat transfer to supercritical CO2 flowing upward in vertical bare tubes
Heat transfer in the forced convection regime of fluids at supercritical conditions has been studied extensively for the past 60 years. The dominant approach to summarize the experimental results was by proposing empirical correlations for the data within the investigated range of parameters. It …
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Heat transfer to supercritical water flowing in short vertical bare tube and rod-bundle geometries
… pressures, requiring detailed studies of Heat Transfer (HT). This research investigates experimental data from vertical bare tubes and rod-bundle geometries (single-rod annular channel and 3-rod bundles with helical ribs) at pressures of 22.6–27.5 MPa, mass fluxes of 248–2700 kg/m²s, and …
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Study on heat transfer to supercritical water in application to SMRs
… of its Levelized Unit of Energy Cost (LUEC). Heat transfer data was examined for the onset of deteriorated heat transfer using three correlations that relied on NIST REFPROP v.10 for thermophysical property values. The experimental inside-wall temperature and heat transfer coefficient profiles …
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Specifics of forced-convection heat transfer to supercritical water flowing upward in annular and bundle flow geometries
… and bundle-flow geometries impede coolant flow, heat transfer to the coolant would occur differently than in bare tubes. The main objective of this work is to propose and verity a universal method to accurately predict Heat Transfer Coefficients (HTCs) and wall temperatures using HTC …
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Assessment of FLUENT CFD code as an analysis tool for SCW applications
… methods available to predict the effects of the heat transfer phenomena within the pseudocritical region are based on empirical one-directional correlations which do not capture the multi-dimensional effects and do not provide accurate results in regions such as the deteriorated heat transfer …
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CFD determination of fluid and geometry related localized heat transfer phenomena for supercritical water flow
… a phase change. One example is the specific heat, which exhibits a sharp peak at a point defined as the pseudocritical temperature. Computational Fluid Dynamics (CFD) is a numerical approach to model fluids in multidimensional space using the Navier-Stokes equations and databases of fluid …
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Study of heat transfer in a 7-element bundle cooled with the upward flow of supercritical Freon-12
… costs at very high pressures, temperatures and heat fluxes. However, SuperCritical Water-cooled nuclear Reactor (SCWRs) designs cannot be finalized without such data. Therefore, as a preliminary approach experiments in SCW-cooled bare tubes and in bundles cooled with SC modeling fluids can be …
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The mitigation of crystallization fouling in a falling-film flow: A self-cleaning mechanism driven by flow and wetting behavior
Crystallization fouling (or scaling) on heat transfer surfaces occurs in a wide range of applications in modern industries, such as desalination, food processing, petroleum refinery, and so on. Negative consequences of scaling include deteriorated heat transfer performance due to the formation of …