Predicting the drag coefficient and settling velocity of spherical particles

Terfous, Abdelali; Hazzab, Abdeldjebar; Ghenaim, Abdellah

doi:10.1016/j.powtec.2013.01.052

Cited by 86 publications

(23 citation statements)

References 45 publications

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“…Oscillations are much more dominant in the solution of small gaps as well. In experiments, the settling velocity (v s ) is reached within a short time span [16]. In our pumping system, the terminal velocity is reached in fractions of seconds.…”

Section: Modified Drag Coefficient (β * )mentioning

confidence: 95%

Magnetically actuated circular displacement micropump

Gusenbauer

Mazza

Posnicek

et al. 2017

Int J Adv Manuf Technol

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The development process of a magnetically actuated displacement micropump is demonstrated. Two permanent magnets are driven by electromagnets in a circular housing. The magnetic plugs dynamically act as valve or as driving unit. A theoretical model is used to obtain the plug velocities in the system through the calculation of the force equilibria. Especially, the small gap between the channel wall and the plug has a large influence on the resulting pump performance. Final design parameters are obtained by computational fluid dynamics simulations, which predict occurring pressure loads and developing flow rates. Additive manufacturing can be used to build the device. All materials in the fabrication are biocompatible to allow water, liquid foods, and cell-containing fluids like blood to be pumped. A detailed experimental and theoretical comparison is given for two different pump layouts.

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Section: Modified Drag Coefficient (β * )mentioning

confidence: 95%

Magnetically actuated circular displacement micropump

Gusenbauer

Mazza

Posnicek

et al. 2017

Int J Adv Manuf Technol

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“…This approach has already been used successfully in previous studies and it has been demonstrated that the test method is feasible [16][17][18].…”

Section: Measurement Of Settling Velocitymentioning

confidence: 99%

Predicting the Floc Characteristics and Settling Velocity of Flocs under Variable Dosage of Polyacrylamide

Shi¹,

Zhang²,

Pei³

et al. 2017

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Abstract. In this study, floc characteristics such as fractal dimension and settling velocity were investigated through a flocculantion process with a polyacrylamide (PAM) flocculant over a range of suspended particle concentrations, suspension type and flocculant dosage. The floc's structure and morphology were characterized by optical microscopy and scanning electron microscopy (SEM) methods. Floc settling velocity was measured in a settling column in a laboratory. The results showed that, the surface fractal dimension ranged from 1.044 to 1.415, which quantitatively confirmed the round and layered structure of flocs observed in SEM analyses. The PAM flocculant was proved to be more effective in flocculantion process, increasing the settling velocity. Therefore, an appropriate PAM dosage is an excellent candidate as efficient flocculant. A possible flocculantion mechanism for PAM was further analyzed. For alkaline or neutral environments, adsorption and bridging effects are dominant while charge neutralization is favored in acidic conditions.

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“…To find a simple, accurate, and general correlation that covers a large interval of Reynolds number, we developed a correlation to calculate drag coefficient in terms of Reynolds number using experimental data. Borrowing from the concept proposed by Terfous et al (2013), we knew every dataset can be represented approximately by a function of the type:…”

Section: Static Settling Experimentsmentioning

confidence: 99%