By Tadeusz Kudra
Presents Drying Breakthroughs for an Array of Materials
Despite being one of many oldest, such a lot energy-intensive unit operations, business drying could be the least scrutinized process on the microscopic point. but within the wake of today’s worldwide power main issue, drying learn and improvement is at the upward push.
Following within the footsteps of the generally learn first version, Advanced Drying applied sciences, moment Edition is the direct end result of the new extraordinary development in drying literature and new drying undefined. This variation presents an evaluative review of recent and rising drying applied sciences, whereas putting higher emphasis on making the drying method extra power effective within the green age.
Draws at the Authors’ 60+ Years of mixed Experience
Fueled by way of the present strength challenge and growing to be client call for for more desirable caliber items, this completely up to date source addresses state-of-the-art drying applied sciences for various fabrics equivalent to high-valued, heat-sensitive prescription drugs, nutraceuticals, and a few meals. It additionally introduces leading edge options, resembling heat-pump drying of meals, which permit either commercial perform and study and improvement initiatives to save lots of power, decrease carbon footprints, and hence enhance the base line.
Four New Chapters:
- Fry Drying
- Refractance Window Drying
- Mechanical Thermal Expression
Requiring no earlier wisdom of chemical engineering, this single-source reference may still help researchers in turning the laboratory curiosities of this present day into the innovative novel drying applied sciences of tomorrow.
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Extra info for Advanced drying technologies
3 MODELING AND SCALE-UP Despite numerous published papers on the subject of drying of suspensions on inert particles, there is insufficient data available in the open literature that can be used with confidence for process calculations and dryer design, with the possible exception of a vortex bed dryer with inert particles (Kutsakova and Bogatyriev, 1987). 1), which have distinctly different characteristics with respect to bed structure, particle and gas flow patterns, circulation velocities and distributions, re-coating ratio, surface renewal rate, etc.
In either case, particles accelerate with the original gas stream into one of the impingement chambers where they collide with the secondary gas stream, penetrate it up to the stagnation point, and then begin to accelerate in the opposite direction. At this moment, the gas outlet of the first impingement chamber is closed while the outlet of the second impingement chamber is open. This procedure results in the flow of a secondary gas stream with accelerating particles along the reverse-flow duct toward the second impingement chamber where the process of jet collision, penetration of particles into the original gas stream, and the following acceleration toward the first impingement zone is repeated.
Depending on the hydrodynamic conditions, the liquid coat on the particle surface dries by convective heat transfer from hot air and contact heat transfer due to sensible heat stored in the inert particles. When the coat is dry enough to be brittle, it cracks because of particle-to-particle and particle-towall collisions and peels off from the surface of inert particles. Because of intense attrition, dry product is discharged from the dryer with the exhaust air as a fine powder of rounded particles.