Podcast
Questions and Answers
What occurs in gas-fluidized beds?
What occurs in gas-fluidized beds?
- Large pockets of gas, free of particles, rise through the bed (correct)
- The entire bed becomes a homogenous mixture
- The bed void fraction decreases significantly
- Particles settle at the bottom of the bed
What is the term used to describe the condition where successive bubbles move up the column?
What is the term used to describe the condition where successive bubbles move up the column?
- Particulate fluidization
- Incipient fluidization
- Slugging (correct)
- Bubbling fluidization
What happens to the pressure drop as the superficial fluid velocity is gradually increased from zero?
What happens to the pressure drop as the superficial fluid velocity is gradually increased from zero?
- It suddenly spikes
- It gradually increases (correct)
- It gradually decreases
- It remains constant
What is the point at which the pressure drop starts to decrease?
What is the point at which the pressure drop starts to decrease?
What occurs when very dense particles are in a liquid?
What occurs when very dense particles are in a liquid?
What is the term used to describe the phenomenon where gases at high pressure flow through beds of fine particles?
What is the term used to describe the phenomenon where gases at high pressure flow through beds of fine particles?
What is the primary reason for fluidizing a bed of particles?
What is the primary reason for fluidizing a bed of particles?
What is the term for the minimum velocity of the fluid required to fluidize a bed of particles?
What is the term for the minimum velocity of the fluid required to fluidize a bed of particles?
What type of fluidization occurs in liquids?
What type of fluidization occurs in liquids?
What is the primary application of fluidized beds in the petroleum industry?
What is the primary application of fluidized beds in the petroleum industry?
What is the benefit of using fluidized beds in highly exothermic reaction situations?
What is the benefit of using fluidized beds in highly exothermic reaction situations?
What is the purpose of fluidizing a bed of catalytic particles?
What is the purpose of fluidizing a bed of catalytic particles?
What is the condition to prevent particles from being carried out with the fluid at the exit?
What is the condition to prevent particles from being carried out with the fluid at the exit?
What is the range of void fraction ε for nearly spherical particles?
What is the range of void fraction ε for nearly spherical particles?
What equation should be used to determine the minimum fluidization velocity for large particles?
What equation should be used to determine the minimum fluidization velocity for large particles?
What is the result of combining Equations (11) and (12) and eliminating pressure drop?
What is the result of combining Equations (11) and (12) and eliminating pressure drop?
What is the state of the bed when the superficial velocity Vs is equal to Vf?
What is the state of the bed when the superficial velocity Vs is equal to Vf?
What is the ratio of the settling velocity to the minimum fluidization velocity for ε lying in the range 0.40 - 0.45?
What is the ratio of the settling velocity to the minimum fluidization velocity for ε lying in the range 0.40 - 0.45?
