Advanced drying technologies by Tadeusz Kudra PDF

By Tadeusz Kudra

ISBN-10: 0824796187

ISBN-13: 9780824796181

Presents Drying Breakthroughs for an Array of Materials

Despite being one of many oldest, such a lot energy-intensive unit operations, commercial drying may be the least scrutinized procedure on the microscopic point. but within the wake of today’s international power challenge, drying examine and improvement is at the upward push.

Following within the footsteps of the generally learn first variation, Advanced Drying applied sciences, moment Edition is the direct consequence of the new extra special progress in drying literature and new drying undefined. This variation presents an evaluative evaluate of latest and rising drying applied sciences, whereas putting larger emphasis on making the drying approach extra strength effective within the green age.

Draws at the Authors’ 60+ Years of mixed Experience

Fueled by way of the present power problem and turning out to be buyer call for for stronger caliber items, this completely up-to-date source addresses state-of-the-art drying applied sciences for varied fabrics resembling high-valued, heat-sensitive prescription drugs, nutraceuticals, and a few meals. It additionally introduces leading edge suggestions, reminiscent of heat-pump drying of meals, which permit either business perform and examine and improvement initiatives to avoid wasting power, lessen carbon footprints, and therefore enhance the base line.

Four New Chapters:

  • Spray-Freeze-Drying
  • Fry Drying
  • Refractance Window Drying
  • Mechanical Thermal Expression

Requiring no earlier wisdom of chemical engineering, this single-source reference may still support researchers in turning the laboratory curiosities of this present day into the innovative novel drying applied sciences of tomorrow.

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Sample text

2000). 6 Some configurations of the impinging-stream reactors. 5–15 50–2000 up to 5000 1500–30,000 up to 1700 1–10 half of its oscillatory flow. 1). The unique characteristics of impinging streams also offer special advantages for thermal processing. An example is the intermittent drying that takes place when the opposing streams are supplied at different temperatures. Thus, particles are heated and cooled periodically when oscillating between hot and cold gas streams. Another example is puffing of grains (thermal micronizing), which occurs when wet grain is subject to high moisture and temperature gradients.

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. When chipping due to the impact of inert particles prevails attrition, small flakes are produced especially when drying brittle materials of biological origin. Small flakes can also be obtained when using inert particles with a corrugated surface.

5 Particle trajectory for double penetration in a semicircular impinging streams (F c ϭ centrifugal force; F cp ϭ centripetal force; F D ϭ drag force; F ϭ lift force). Planar with circumferential flow, in which streamlines form concentric circles in the impingement plane Tubular, in which impinging streams meet at the cylindrical surface Annular, in which impinging streams meet in a sector of annulus Single impinging stream units can be combined in series and/or in parallel to form a system allowing extension of the residence time and development of different hydrodynamic or temperature regimes.

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Advanced drying technologies by Tadeusz Kudra


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