Modeling filtered heat transfer model by considering dimensionless temperature difference between gas and solid phases

Computational fluid dynamics-discrete element method is used to simulate gas-solid flows with heat transfer. The strategy of repetitively resetting the gas phase temperature is adopted to maintain the temperature difference between the gas and solid phases. The difference between the heat transfer characteristics produced by this strategy and the traditional heat source method is analyzed. It is found that heat transfer in dense regions is artificially enhanced by the heat source method. Therefore, the results obtained by the temperature reset method are filtered to develop a three-marker model for the filtered interphase heat transfer coefficient (IHTC). In the developed model, the filtered gas-solid temperature difference is nondimensionalized by the average gas-solid temperature difference in surrounding grids, which is shown to have an impact on the filtered IHTC. The developed model is demonstrated to be effective and accurate in both a prior and a posterior tests.

Automated summary

The computational fluid dynamics-discrete element method is employed to simulate gas-solid flows with heat transfer. By adopting the strategy of repetitively resetting the gas phase temperature, the temperature difference between the gas and solid phases is effectively maintained. The study reveals that the traditional heat source method artificially enhances heat transfer in dense regions, hence a filtering approach is used to develop a more accurate model for the interphase heat transfer coefficient.