By Melvyn Pell; J C Williams; Terence Allen
Sustainable agriculture is a speedily transforming into box aiming at generating nutrients and effort in a sustainable means for people and their teenagers. Sustainable agriculture is a self-discipline that addresses present matters resembling weather switch, expanding nutrition and gas costs, poor-nation hunger, rich-nation weight problems, water toxins, soil erosion, fertility loss, pest regulate, and biodiversity depletion. Novel recommendations are proposed in line with built-in wisdom from sciences as assorted as agronomy, soil technology, molecular biology, chemistry, toxicology, ecology, financial system, philosophy and social science. Read more...
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Extra info for Handbook of powder technology / Volume 8, Gas fluidization / Mel Pell
The large diameter shroud has to be long enough for the expanding jet velocity profile to fill the pipe. A shroud t h a t is too short will allow solids to fall into the shroud and be entrained in the jet causing severe erosion problems. 6 There are may grid design variations t h a t can be envisioned. Geldart (2), Kunii and Levenspiel (9) and Zenz (8) display a number of these and comment on the origins of the designs. It is up to the designer to make a selection based on the needs of his system.
1961) xMIYAUCHIET AL. (1968) + AVIDAN(1980) A ^ I i I i J y/o 0 yS S^ ! 5 1 Bed Diameter, m i 2 i 10 Solids and Gas Eddy Diffusivity Fig. 25 Gas Velocity, m / s Axial Solids Backmixing vs Velocity from (8) with permission Fig. 5 Gas Velocity, m/s Axial Gas Backmixing Fig. 8 m / s and then decreases with velocity. The backmixing peaks in the turbulent regime and then falls as "fast" fluidization begins. The effect of diameter was not studied, but it is expected that it would be similar to the diameter effect on solids diffusion.
3 When the bubble reaches 50-75% of the vessel diameter, the system is said to be slugging. In small containers, solids can be lifted as plug; in larger units they can rain along the sides of the container as the bubble rises up the center. The problem with slugging is associated with scale up. When slugging occurs, bubble size and velocity are limited and mass transfer is much better than would be observed in a larger diameter vessel with greater bubble size. Failure to be aware of this effect can lead to scale up problems.
Handbook of powder technology / Volume 8, Gas fluidization / Mel Pell by Melvyn Pell; J C Williams; Terence Allen