| Lectures: 4 Periods/Week | Sessional Marks: 30 |
| University Exam: 3 Hours | University Examination Marks: 70 |
UNIT-I
Introduction: Phenomena of fluidization, liquid like behaviour of fluidized beds, advantages and disadvantages of fluidized beds, different types of fluidized beds, application of fluidization techniques in process industries.
Fixed beds: Derivation of fixed bed pressure drop equations from fundamental characteristics, Kozeny Carman equation and Ergun's equation. Effect of particle size, sphericity, vesicularity, wall effect, surface roughness and voidage on fixed bed pressure drop.
UNIT-II
Minimum fluidization: Derivation for minimum fluidization mass velocity, pressure drop equation for minimum fluidization.
Fluidization: Types of fluidization, batch, continuous and semi fluidizations, pressure drop flow diagrams, slugging, channeling, effect of L/D, fluid distributors, mode of fluidization, power consumption and pumping requirements.
UNIT-III
Bubble phenomena: Single rising bubble, two dimensional Davidson model, maximum stable bubble size, criteria for the stability of the bubble, rise velocity of a gas bubble, bubbling bed model for the bubble phase.
Terminal Velocity: Derivation for terminal velocity.
Entrainment and Elutriation: Transport disengaging height (TDH), entrainment at or above TDH, single size of solids, entrainment below TDH, elutriation rate equation, elutriation of fines, entrainment for an infinite Free Board and small Free Board.
UNIT-IV
Flow of High Bulk Density and Low Bulk Density Mixtures: Pressure drop in stick-slip flow, pressure drop in aerated flow, downward discharge from a vertical pipe, flow in a horizontal pipe.
Saltation velocity (horizontal flow), choking velocity (vertical flow), pressure drop in beds, cyclones in fluidized bed reactors.
Spouted bed: Pressure drop flow diagram, minimum spouting correlation, spouting requirements.
Text Books