An accurate understanding of slag cooling characteristics is essential for efficient slag heat recovery. Herein, we established multiple cases including different assumptions, such as dimensions, boundary conditions, width ratios, radiation models, and turbulence models to quantify the extent of error associated with these assumptions. An area-weight angle sampling method was adopted to evaluate the accuracy of assumptions. The results reveal the significant error attributed to dimensions and radiation, with RMSE and MAPE of 235.14 K and 41.30% for the 2D planar model, and 198.60 K and 25.66% for the model without radiation. Notably, when the width ratio exceeds 4, the influence of boundary conditions on cooling characteristics becomes negligible. This present work provides a benchmark model to quantify the error of assumptions and thus enables more accurate yet efficient modeling for phase-change cooling for molten slag at ultrahigh temperatures.
Keywords Waste heat recovery, Droplet cooling, Phase change, Dry slag granulation