Development of heat transfer correlation of turbulent forced convection in subchannels with rough surfaces based on CFD

Article Thermodynamics

The effects of surface roughness on fully developed laminar and transitional flow friction factors and heat transfer coefficients in horizontal circular tubes

Marilize Everts et al.

Summary: This study experimentally investigated the simultaneous heat transfer and pressure drop characteristics in the laminar and transitional flow regimes for tubes with internally roughened surfaces. It was found that an increase in surface roughness favored an increase in heat transfer in the laminar flow regime but not in other flow regimes. The study also identified three distinct regions of influence of surface roughness on the critical Reynolds number: Dampening region, Enhancing region, and Saturating region.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER (2022)

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Article Nuclear Science & Technology

Development of friction factor correlations for hexagonal and square bundles with rough rods based on CFD

Maolong Liu et al.

Summary: This study investigates the impact of surface roughness on the friction pressure drop factor of fuel assembly by calculating the friction pressure drop factor. Two new friction factor correlations are proposed and validated for different flow regimes, providing important implications for the design and safety analysis of light water reactors.

ANNALS OF NUCLEAR ENERGY (2022)

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Article Energy & Fuels

Study of Flow and Heat Transfer Characteristics of Lead-Based Liquid Metals in a Turbulent Tube Flow and the Impacts of Roughness

Yaou Shen et al.

Summary: This study investigated the flow and heat transfer characteristics of lead-based liquid metals in a circular tube, finding higher friction factors and variable Nusselt numbers compared to water. Theoretical analyses showed that roughness impacts heat transfer by reducing conductive heat transfer while enhancing convective heat transfer, with implications for thermal-hydraulic design of LLM reactors.

FRONTIERS IN ENERGY RESEARCH (2021)

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Article Thermodynamics