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Develop improved heat transfer correlations for high-Prandtl-number molten salts undergoing mixed convection in reactor downcomers, particularly within the heat transfer deterioration regime.

July 20, 2023Nuclear Technology

Toward Improved Correlations for Mixed Convection in the Downcomer of Molten Salt Reactors

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TNTri NguyenArgonne National Laboratory EMElia MerzariPennsylvania State University CTCheng-Kai TaiNorth Carolina State University

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Implication

Computational simulation study reveals novel heat transfer correlations for high-Prandtl-number molten salts, indicating improved cooling predictions across mixed convection regimes in reactor...

Key Points

Develop improved heat transfer correlations for high-Prandtl-number molten salts undergoing mixed convection in reactor downcomers, particularly within the heat transfer deterioration regime.
Simulated fluid flow in a simplified heated parallel-plate downcomer using the GPU-accelerated spectral element code NekRS for direct numerical simulation.
Evaluated 74 total simulation cases covering Richardson numbers from 0 to 400 at FLiBe coolant Prandtl numbers of 12 and 24.
Formulated novel mixed-convection correlations as functions of the buoyancy number to characterize Nusselt number behavior across high-Prandtl-number fluid regimes.
Developed a modified Reynolds-Gnielinski correlation for laminarization and a free-convection correlation for natural-convection dominance, successfully modeling the heat transfer deterioration region.

Cite This Study

Nguyen et al. (2023) studied this question.

synapsesocial.com/papers/6aaa550184ffb20652eb8867 https://doi.org/10.1080/00295450.2023.2223036

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Implication

Computational simulation study reveals novel heat transfer correlations for high-Prandtl-number molten salts, indicating improved cooling predictions across mixed convection regimes in reactor...

Toward Improved Correlations for Mixed Convection in the Downcomer of Molten Salt Reactors

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Implication

Key Points

Cite This Study

Toward Improved Correlations for Mixed Convection in the Downcomer of Molten Salt Reactors

Discussion

Member takes

Implication

Key Points

Cite This Study

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