Breakup of high solid volume fraction oil–particle cluster in simple shear flow

Mehrabian, Sasan; Bussmann, Markus; Acosta, Edgar

doi:10.1016/j.colsurfa.2015.06.054

Cited by 11 publications

(7 citation statements)

References 48 publications

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“…The solid line corresponds to permeability values calculated using the Carman-Kozeny (CK) model (Equation 14) with 𝛹 =400. The calculation of the radius (𝑟 ) of the drops released from the coalescer required the use of the capillary number, 𝐶𝑎, concept (Mehrabian et al, 2015;Walstra, 1993)…”

Section: ∆𝑃 =mentioning

confidence: 99%

Colloid filtration theories for fibrous bed coalescer design

Ajogbeje

Bhattacharya

Acosta

2022

Preprint

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Fibrous bed coalescers are used in a wide range of applications, from food and soap processing to crude oil and fuel processing, yet there is no formal methodology to size coalescers. The closest form of a design equation comes from Lee and Liu’s (LL) 1980 colloid filtration theory, which considers inertial impaction as a method of drop capture. This work compares the LL framework to two additional colloid filtration theories. The first one is Rajagopalan and Tien’s (RT) 1976 theory, which considers inertial impaction and the detachment of a captured drop due to shear conditions. The second theory is a modified form of the RT framework that includes the coalescence probability (RTCP) between captured drops and drops in the incoming flow. For pad coalescers, the LL, RT, and RTCP theories were compared in terms of the predicted bed length for various combinations of superficial velocities (q) and bed porosities (ε_o). In the typical design range for “q” (0.6 - 3 cm/s), the three frameworks produce similar packed bed lengths. However, only RTCP can be used for high and low “q” values. The RTCP framework was also the only one capable of reproducing the recommended industrial practice for the design of cartridge coalescers. The RTCP framework was also used in a case study for the dewatering of diluted bitumen froth. A fibrous bed coalescer was sized to remove emulsified water from diluted bitumen extracted from the oil sands in the Canadian Athabasca region. The manufacturer-recommended “q” range of 0.6 - 3 cm/s was the most reasonable because higher “q” values produced larger pressure drops in the coalescer and a substantial increase in the size of the gravity separator.

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Section: ∆𝑃 =mentioning

confidence: 99%

Colloid filtration theories for fibrous bed coalescer design

Ajogbeje

Bhattacharya

Acosta

2022

Preprint

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“…Both studies used particles resulting in small particle over droplet size ratios (r/R~0.02-0.11). Mehrabian et al (2015) on the other hand used higher particle over droplet size ratios (r/R~0.21-0.47) at high particle concentration (72 vol%) and concluded by variation of the viscosity ratio (λ = 0.032-2.5) that breakup is in this case completely governed by the viscosity of the interstitial fluid of the dispersed phase.…”

Section: Introductionmentioning

confidence: 97%

“…Besides in polymer blends, droplets encapsulating particles are also of great importance in the oil, printing, and food industry (Smith and van de Ven 1985b;Desse et al 2009;Usta et al 2009;Bonnoit et al 2012;Mehrabian et al 2015;Merkel et al 2015). Consequently, several studies focus on the droplet dynamics of water/oil systems containing particles suspended in the dispersed phase.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of sheared droplets filled with non-Brownian particles

2020

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The dynamics of single droplets containing non-Brownian particles are studied. The particle over droplet size ratio (r/R) is changed by using different particle sizes (r/R = 0.02–0.4). Additionally, the effect of particle concentration (5–20 vol%) is investigated. The dynamics of droplets with r/R = 0.02 show good agreement with the corresponding particle-free reference system which has a comparable viscosity ratio. Hence, this droplet phase can be considered as a homogenous medium characterized by its bulk viscosity which is governed by the particle concentration. However, droplets with r/R ≥ 0.1 show a more suppressed deformation and slower transient dynamics and, therefore, behave as a slightly more viscous medium than expected based on their bulk viscosity. These effects become more pronounced at higher particle concentrations and higher r/R. Moreover, local particle effects like asymmetric droplet shapes, oscillating droplet shapes, and tip streaming start to influence the droplet dynamics at particle concentrations around 15 vol%.

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“…Considerable research has focused on the separation of oil from solid/liquid clusters (a dispersed liquid phase mixed with solid particles) immersed in another liquid. − When the cluster is exposed to a flow field, different modes of breakup have been reported, depending on the volume fraction of the solid particles, the liquid–liquid interfacial tension, and the wettability of the particles . Smith and Van de Ven showed that the deformation or rupture of a partially coated pair of solid particles depends highly on the viscosity of the oil.…”

Section: Introductionmentioning

confidence: 99%

“…The particle size relative to the cluster size and the solid volume fraction are two important parameters that determine the fate of clusters. When the particle size relative to the cluster is small, so that the cluster can be considered as a continuum, then a cluster undergoing shear behaves like a liquid drop with an effective viscosity that is governed by its solid volume fraction. , However, Mehrabian et al showed that the breakup of clusters with high solid volume fraction of large particles can be characterized as simple droplet breakup, meaning that the viscosity of the dispersed phase governs the dynamics of the breakup, rather than an effective viscosity that is a function of the solid volume fraction. Niven et al , reported a thermodynamic approach to modeling the separation of oil–particle clusters.…”

Section: Introductionmentioning

confidence: 99%

Oil–Particle Separation in a Falling Sphere Configuration: Effect of Oil Film Thickness

2016

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High-speed videos of oil-coated solid spheres falling through an aqueous solution were analyzed to determine the amount of oil separated and the velocity of the coated sphere during free fall. The oil-coated sphere configuration is relevant to understanding the recovery of oil from oil sands; hence, bitumen was used as the oil phase. A new form of a capillary number based on a low-Reynolds number solution is introduced to characterize the separation process. The proposed particle-based capillary number takes into account the effect of the oil film thickness and the viscosity ratio. In this study, the separation of oil from an oil-coated sphere is examined as a function of the oil film thickness, while keeping the viscosity ratio constant at 0.08. From the experimental results, it was observed that there is a critical oil film thickness beyond which oil separation from a particle is observed. Higher oil removal efficiencies are obtained at higher oil film thicknesses. The velocity of an oil-coated sphere is higher than the velocity of an oil-free sphere due to the lubrication effect of the oil layer.

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Breakup of high solid volume fraction oil–particle cluster in simple shear flow

Cited by 11 publications

References 48 publications

Colloid filtration theories for fibrous bed coalescer design

Colloid filtration theories for fibrous bed coalescer design

Dynamics of sheared droplets filled with non-Brownian particles

Oil–Particle Separation in a Falling Sphere Configuration: Effect of Oil Film Thickness

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