(a) The height of the sand layer at the onset of fluidisation (b) The pressure drop in the fluidised bed (c) The minimum fluidising velocity (d) The velocity at which transportation of the particles takes place. Assume streamline flow across the particles. Is the assumption correct?

(a) The height of the sand layer at the onset of fluidisation (b) The pressure drop in the fluidised bed (c) The minimum fluidising velocity (d) The velocity at which transportation of the particles takes place. Assume streamline flow across the particles. Is the assumption correct?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Properties of Fluids

The term fluid represents a type of substance that can easily change its shape under any external pressure/force and can flow. Fluids can acquire any shape in which it is stored and can resist normal stresses but cannot resist shear stress in rest condition. Whenever external shear stress is applied to fluids, it starts to flow. The fluids may be liquid or gas. Example- water, air, etc.

Question

7. Air, at 400 °C and 17 bar-abs, is used to fluidise 32700 kg of sand in a cylindrical vessel.
The diameter of the vessel is 3.05 m and that of the particle is 0.147 mm. If the density
of the particles is 2690 kg/m³, calculate:
(a) The height of the sand layer at the onset of fluidisation
(b) The pressure drop in the fluidised bed
(c) The minimum fluidising velocity
(d) The velocity at which transportation of the particles takes place. Assume
streamline flow across the particles. Is the assumption correct?
Air constant, R = 0.287 kJ/kgK
Viscosity of air at fluidization conditions=0.032 cp
Find &M from the curves of Fig 10.12

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