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Showing 1 to 20 of 25 for “"thermal hydraulic performance"”.
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Thermal hydraulic performance analysis of a small integral pressurized water reactor core
A thermal hydraulic analysis of the International Reactor Innovative and Secure (IRIS) core has been performed. Thermal margins for steady state and a selection of Loss Of Flow Accidents have been assessed using three methodologies to account for uncertainty. thermal margin for steady state …
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Thermal hydraulic performance analysis of a small integral pressurized water reactor core
A thermal hydraulic analysis of the International Reactor Innovative and Secure (IRIS) core has been performed. Thermal margins for steady state and a selection of Loss Of Flow Accidents have been assessed using three methodologies to account for uncertainty. The thermal hydraulic analysis has …
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Optimization of the thermal-hydraulic performance of the helium-cooled modular divertor with multiple jets
… on a single HEMJ module to characterize its thermal-hydraulic performance at coolant inlet temperatures up to 425 °C, inlet pressures of 10 MPa, and incident heat fluxes up to 6.6 MW/m^2 using a closed helium loop. The effect of the jets-to-impingement surface separation distance was …
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Experimental study of the thermal-hydraulic performance of a brazed aluminum heat exchanger under wet-surface conditions
… and a full-cone water spray nuzzle, the air-side performance of a liquid-to-air heat exchanger is studied experimentally for wet-surface conditions. The test specimen is a brazed-aluminum, louvered-fin heat exchanger. The total capacity, pressure drop and water drainage behavior under various …
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Study of the effects of external corrosion on the thermal-hydraulic performance of brazed aluminum microchannel heat exchangers
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-12-01
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Predicting the Air-Side Thermal -Hydraulic Performance Characteristics of Flat-Tube Louver-Fin Heat Exchangers Under Dry and Wet Conditions
… under partially wet conditions, and new air-side performance correlations are presented for both dry- and wet-surface conditions. Correlations between the Colbum j or f factors and the Reynolds numbers are developed in the conventional way and compared to multivariate non-parametric regressions. …
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Wire wrapped fuel pin hexagonal arrays for PWR service
… of geometries via steady-state and transient thermal hydraulic analyses, which yield the maximum power, and fuel performance and neutronics studies, which provide the achievable discharge burnup. The final optimization integrates the outputs from these separate studies into an economics model …
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Development of Advanced Internal Cooling Technologies for Gas Turbine Airfoils under Stationary and Rotating Conditions
… cost. The turbine airfoils are coated with thermal barrier coatings (TBCs) and the external surface is protected by film cooling. The internals of gas turbine blades are cooled by relatively colder air bled off from the compressor discharge. Gas turbine internals can be divided into three …
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Multiphase CFD benchmark of experimental critical heat flux data at PWR operating conditions
… represents the fundamental upper limit for thermal hydraulic performance of PWR fuel. Currently, the nuclear industry relies on expensive, prototypical experiments using electrically heated, full-height rod assemblies to determine the limit of the boiling crisis. The development of …
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PLATE HEAT EXCHANGER IMPROVEMENTS WITH SHAPE OPTIMIZATION
… approach temperature, and good heat transfer performance. PHXs are increasingly utilized and becoming very competitive in two-phase flow applications due to their desirable thermal-hydraulic characteristics. Pillow plate heat exchanger (PPHX) is a type of PHXs that consists of wavy plates that …
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Thermal and Hydraulic Characterization of Hook-Shaped Fins and Dimples
… fluid mixing, and generating turbulence. Their thermal-hydraulic performance can be modified by introducing tip clearance or adjusting the attack angle. This study quantifies the heat transfer coefficient and pressure drop of GRIPMetal arrays – hook-shaped fins with dimples – under varying tip …
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Liquid-infused slippery surfaces for air-conditioning and refrigeration applications
… to minimize the water retention and enhance thermal-hydraulic performance for air-conditioning and refrigeration (AC&R) applications. The results demonstrate that the LISs has a sliding angle smaller than 5˚ and reduces the water retention ratio after defrosting by more than 75% compared to …
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Calculating failure probabilities of passive systems during transients
… system configurations, because it focuses on the thermal-hydraulic performance of a safety function.
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Friction pressure drop measurements and flow distribution analysis for LEU conversion study of MIT Research Reactor
… fuel at the MITR, together with the supporting thermal hydraulic analyses, propose different fuel element designs for optimization of thermal hydraulic performance of the LEU core. Since proposed fuel design has a smaller coolant channel height than the existing HEU fuel, the friction pressure …
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Detailed Heat Transfer Measurements of Various Rib Turbulator Shapes at Very High Reynolds Numbers Using Steady-state Liquid Crystal Thermography
… rib shapes varied between 1.3 and 1.7 and the thermal hydraulic performance was found to be less than unity.
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Heat Transfer Performance Improvement Technologies for Hot Gas Path Components in Gas Turbines
… with a view towards increasing the overall thermal efficiency and specific power output. As a result of increased turbine inlet temperatures, the hot gas path components downstream of the combustor section are subjected to high heat loads. Though materials with improved temperature …
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Air-side condensate management: Drainage channels in heat exchangers
… result in several adverse effects on the overall thermal-hydraulic performance. In order to improve the performance of compact heat exchangers under wet-surface conditions, promoting the drainage of condensed water is critical. Drainage channels on tube walls might provide a robust solution to …
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Thermal-hydraulic analysis of innovative fuel configurations for the sodium fast reactor
… interaction (FCCI) for metallic fuel, cladding thermal and irradiation strain, the fuel melting point, sodium boiling, and to a lesser extent the sodium pressure drop in the fuel channels. Therefore, innovative fuel configurations that reduce clad stresses, sodium pressure drops, and fuel/clad …
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Detailed Experimental Measurements of Heat Transfer Augmentation in Internal Channels Using a Thermochromic Liquid Crystal Technique
… for gas turbine blade is critical to system performance. To achieve maximum efficiency, i.e. maximum cooling with minimum coolant usage, intensive research is required to optimize heat transfer enhancement features. The present study aims at experimental and numerical investigation of two …
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General analysis of breed-and-burn reactors and limited-separations fuel cycles
… fraction, and helium coolant. If sufficient fuel performance margin exists, sodium coolant can be substituted in place of helium to achieve higher power densities at a modest burnup and DPA penalty. For a minimum-burnup B&B reactor, reasonably achievable minimum DPA values are on the order of …
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