What is fluidizing velocity?
The minimum fluidization velocity depends on particle moisture content; increasing moisture content increases the minimum fluidization velocity. For wet particle fluidization, the bed pressure drop for velocities above the minimum fluidization point gradually increases with increasing gas velocity (Hajidavalloo, 1998).
How do you calculate fluidisation velocity?
The minimum fluidization velocity is determined empirically by the intersection of the pressure drop versus the superficial velocity curve and the pressure drop equals the weight of the bed line, as illustrated in Fig.
What is terminal velocity in fluidized bed?
Instead of a body falling through a stagnant fluid, in a fluidized bed, the fluid is moving the body. A particle’s terminal velocity is the lowest gas velocity that causes particles to start moving with the gas. This is the point at which entrainment begins.
How do you measure superficial velocity?
To calculate a Superficial Gas Velocity, divide the flow rate of the phase by the cross-sectional area of the medium.
What is bubbling fluidization?
A bubbling fluidized bed (BFB) boiler is a boiler that can also handle fuels that are difficult to pulverize or less combustible. The fuel is introduced into a mixture of sand flowing at high temperatures, allowing the fuel to be efficiently combusted.
What is slugging in reactor?
Another problematic aspect that can arise from bubble growth in deep fluidized beds is slugging, by which is meant bubbles growing so big that they almost cover the entire cross-section of the reactor.
What is superficial velocity in fluidized bed?
Superficial velocity (or superficial flow velocity), in engineering of multiphase flows and flows in porous media, is a hypothetical (artificial) flow velocity calculated as if the given phase or fluid were the only one flowing or present in a given cross sectional area.
What is meant by superficial velocity?
Can velocity and interstitial velocity?
Interstitial velocity is defined as the upward velocity of the air through the open area between the filter bags inside a dust collector. Upward velocity occurs when a hopper inlet is used on a pulse-jet baghouse.
