By Tadeusz Kudra
"Presents the newest breakthroughs in thermal dehydration, drying, and dewatering. Emphasizes rising gear, leading edge options, and reasonably priced thoughts for numerous commercial and agricultural purposes. bargains class and choice standards for brand new and complex drying systems."
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Additional resources for Advanced Drying Technologies
Clearly, the material temperature is higher than the respective wet bulb temperature. At the same time, the material temperature is lower than the outlet air temperature, and this difference tends to be larger at lower inlet air temperatures. 4 Material temperature versus exhaust and inlet air temperatures. ) Drying on Inert Particles 35 kowski (1992), who found the difference between the particle surface temperature and the wet bulb temperature to be at least 20°C. , 1998) report on fluid bed temperatures lower by 15°C than the temperature of the outlet air.
Considering hydrodynamics of the spouted bed, the most logical description of the drying process appears to be provided by the three-region model (TRM) (Oliveira and Freire, 1996). This model is based on a generalized assumption that each distinct region of the bed (an annulus, a spout, and a fountain) contributes to water evaporation in a proportion determined by their respective heat and mass transfer coefficients, residence times within the zones, and the local temperature and humidity gradients.
6. 4 TRENDS IN DRYING RESEARCH AND DEVELOPMENT It is extremely difficult, if not impossible, to make definitive statements about the direction drying technologies will take in the next several decades. Most of the developments in this field have occurred in the last three or four decades. As the general standard of living around the world rises along with the population of the world, it is obvious that the need for drying technologies will increase. New demands will be made on better energy efficiency, lower environmental impact via legislative measures, utilization of renewable energy for drying, better-quality products at lower total costs.