Characteristics of Fluidized Particles

Lewis, W. K.; Gilliland, E. R.; Bauer, Walter C.

doi:10.1021/ie50474a004

Cited by 265 publications

(81 citation statements)

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“…This expression was verified in experiments of Wilhelm and Kwauk [1948] and Lewis, Gilliand and Bauer [1949]. Combining now (7.4) and (7.7) we get…”

Section: Dynamic and Wall Friction Pressure In A Fluidized Bedsupporting

confidence: 75%

Fluidization of 1204 spheres: simulation and experiment

et al. 2002

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In this paper we study the fluidization of 1204 spheres at Reynolds numbers in the thousands using the method of distributed Lagrange multipliers. The results of the simulation are compared with a real experiment. This is the first direct numerical simulation of a real fluidized bed at the finite Reynolds number encountered in the applications. The simulations are processed like real experiments for straight lines in lot-log plots leading to power laws as in celebrated correlations of Richardson and Zaki [1954]. The numerical method allows for the first ever direct calculation of the slip velocity and other averaged values used in two-fluid continuum models. The computation and the experiment show that a single particle may be in balance under weight and drag for an interval of fluidizing velocities; the expectation that the fluidizing velocity is unique is not realized. The numerical method reveals that the dynamic pressure actually decreases slowly with the fluidizing velocity. Tentative interpretations of these new results are discussed.

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“…This expression was verified in experiments of Wilhelm and Kwauk [1948] and Lewis, Gilliand and Bauer [1949]. Combining now (7.4) and (7.7) we get…”

Section: Dynamic and Wall Friction Pressure In A Fluidized Bedsupporting

confidence: 75%

Fluidization of 1204 spheres: simulation and experiment

et al. 2002

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“…An equation proposed by Lewis et al was employed for voidage compensation (Lewis et al, 1949). As seen in Fig.…”

Section: Resultsmentioning

confidence: 99%

Removal kinetic model of oil droplet from o/w emulsion by adding methylated milk casein in flotation

2012

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In this study, o/w emulsion flotation experiments were conducted by with adding methylated milk casein (MeSC). Emulsion used in this study was prepared by ultrasonic emulsification of heavy oil (bunker-A) and sodium dodecyl sulfate (SDS) solution. A simple kinetic model was proposed to estimate the removal rate of the oil droplets within the column. The model was based on main assumption that adsorption of single droplet adsorbed MeCS or floc onto bubble surface within flotation column. Removal rate constant, K, was defined by k a X s (S b  /V), where k a and X s are overall adsorption rate and saturated adsorption density of oil droplet or floc, S b ,  and V are bubble surface production rate, retention time of bubble swarms and emulsion volume within the column, respectively. The experiments were conducted with varying operating conditions; superficial gas velocity, column dimension and emulsion volume. K was evaluated from slope value of obtained straight line by plotting time versus ln(T/T 0 ), where T/T 0 is relative turbidity. K was mostly proportional to (S b  /V), which corresponds to specific surface area of bubble swarms per unit volume within the column, in the present experimental region. This result suggested that efficiency of this removal process was mainly controlled by the specific surface area of bubble swarms, and proposed model was fundamentally verified.

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“…(ii) their terminal velocity can be calculated by Allen`s equation (Allen, 1990) in our experimental range, and (iii) an equation for voidage compensation proposed by Lewis et al (Lewis et al, 1949) was employed. This was reported in our previous studies (Suzuki et al, 1995;Suzuki and Maruyama, 2001).…”

Section: Model Descriptionmentioning

confidence: 99%