A new CFD-DEM model integrating particle-liquid and particle-wall heat transfer for ice slurry melting in heat exchange tube

Abstract

Ice slurry, a promising phase-change fluid for thermal energy storage and transport, exhibits complex flow and melting behaviors that are not fully captured by existing numerical models. A coupled Eulerian-Lagrangian framework is presented to calculate ice slurry phase change in a heat exchanger. This modelling framework comprehensively integrates three heat transfer mechanisms: (i) particle-fluid convective heat transfer, (ii) direct conductive particle-wall contact heat transfer, and (iii) liquid film conduction for particle-fluid-wall thermal exchange. Results show that liquid film conduction contributes 60 ∼ 82% of the total heat transfer rate, while particle-fluid convection accounts for 18 ∼ 40%, and direct particle-wall contact heat transfer is negligible (<1%). The minimum conduction distance significantly influences melting efficiency, with a reduction from 10 ⁻⁶ m to 10 ⁻¹² m increasing total heat transfer by up to 338 W at a wall temperature of 303.15 K. Axial analysis reveals three distinct melting regimes: uniform, stratified development, and stable melting. This work provides a comprehensive and particle-resolved framework for optimizing ice slurry-based heat exchangers.

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