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• W1145896274 abstract "The incipient instability in gas fluidized bed has not been fully understood despiteextensive studies were conducted. A new transient theory was proposed by adoptingthe principles advanced by Tan and Thorpe (1992 and 1996) and Tan et al. (2003),and this was verified by computational fluid dynamic (CFD) simulations. The theoryof instability in porous media has two functions. One involved the moleculardiffusion of a microscopic mass flux in the gas phase with potential adverse densitygradient, buoyancy convection in gas will occur, but the solid particles willstationary. If the solid particles were subjected to very high mass fluxes which ischaracterized by its high gas velocity such as those exceeding the minimum velocityof fluidization, then the buoyancy force of the particles will be overcome and thesolids will be moved and fluidized almost instantaneously.2D time dependent simulations were conducted using a CFD package - FLUENT forgas diffusion in porous media to observe buoyancy convection and also the incipient instability in fluidized bed, using various gas pairs, mass fluxes and particles sizes.As a prelude to these studies, transient convection induced by gas diffusion inanother gas was conducted, so as to understand fully the instability induced by massdiffusion. The simulated critical Rayleigh number were found to be 531 and 707 fortop-down and bottom-up gas-gas diffusion respectively, which were very close to thetheoretical value of 669 and 817. For transient buoyancy instability induced by gasdiffusion in porous media, the average simulated critical Rayleigh number was foundto be 26.7, which agreed very well with the theoretical value of 27.1. The simulatedonset time of buoyancy convection were also found to be in good agreement with thepredicted value. Very often gas velocity is used in designing a fluidized bed, despitethat the instability of the bed is actually induced by the mass fluxes of the gas whichprovide the required velocity. Incipient instability in fluidized bed is caused by fluidvelocity higher than the minimum fluidization velocity, Umf. The simulations ofincipient instability showed that the bed behavior was dependent on the fluid velocityand the particle size and porosity. The incipient instability was preceded by the gasor pressure saturation of the interstices, induced a high momentum force due to thehigh mass flux which mobilized and lifted the particles once the critical Rayleighnumber was exceeded. The simulated critical Rayleigh number was found to be 30.4,which agreed with the theoretical value of 27.1 for buoyancy instability in porousmedia. The simulated critical times of the incipient instability in fluidized bed werein good agreement with the predicted values and reported experiments in literature.The bed pressure drop, expansion ratio and void fraction after the fluidization weresuccessfully simulated and were found to be in good agreement with experimentsand theoretical values." @default.
• W1145896274 created "2016-06-24" @default.
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• W1145896274 date "2004-03-01" @default.
• W1145896274 modified "2023-09-27" @default.
• W1145896274 title "Theory And Simulation Of The Incipient Gas-Solid Fluidized Bed" @default.
• W1145896274 hasPublicationYear "2004" @default.
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