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Volumetric heat transfer coefficient in spray drying of soymilk powder

Abstract In this study, an empirical equation of the volumetric heat transfer coefficient in spray-drying of soymilk powders was developed. Response Surface Methodology RSM was employed to examine the effects of feed concentration and inlet air temperature on the volumetric heat transfer coefficient in the drying chamber. Overall, results show that the concentration of feed solution had a greater effect than the inlet air temperature. An increase in the feed concentration led to a sharp decrease in the volumetric heat transfer coefficient in the drying chamber, whereas the volumetric heat transfer coefficient increased slightly with rising the inlet air temperature of spray dryer. Highlights Volumetric heat transfer coefficient of spray dryer was compared to other dryers. Empirical equation of the volumetric heat transfer coefficient was developed. Response Surface has been a relevant methodology to examine the spray drying conditions Concentration of feed solution had a greater effect than the inlet air temperature.