Wall-retardation effects on particles settling through non-Newtonian fluids in parallel plates

Zhang, Guodong; Li, Mingzhong; Xue, Jian-Quan; Wang, Lei; Hui, Hui

doi:10.1515/chempap-2016-0082

Cited by 12 publications

(3 citation statements)

References 27 publications

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“…Machac [48] established a wall factor calculation model for parallel plates in power-law liquids. Studies have shown that the wall retardation effect decreases with the decrease in the power-law fluid fluidity indicator n. Malhotra [49] and Zhang [50] experimentally studied the wall retardation effect of particles in elastic fluid, and the results showed that fluid elasticity can decrease the wall retardation role. Song [51] studied the influence of power-law fluid and viscoelastic fluid on the wall retardation role in parallel plates, and the device used is displayed in Figure 5.…”

Section: Transition Region and Turbulencementioning

confidence: 99%

A Review of the Settling Law of Drill Cuttings in Drilling Fluids

Hou,

Yuan,

Chen

et al. 2023

Processes

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During the drilling process, cuttings settle under the action of gravity, which easily results in the formation of a cuttings bed, which then results in wellbore cleaning problems. The settling law of cuttings in drilling fluid is essentially a problem of solid–liquid two-phase settling. This study analyzes and summarizes the effects of the wall effect, the rheology of the fluid, particle shape irregularity, and particle concentration on the settling rate of particles and clarifies the problems faced by current research on the settling rate of particles and the development direction. Studies have shown that walls exert additional blocking effects on particles, thus reducing their settling velocity. The shear thinning effect of non-Newtonian fluids such as power-law fluids and Herschel–Bulkley fluids will reduce the viscosity of the liquid, thus increasing the settling velocity of the particles. Compared with spherical particles, irregular particles will obtain higher resistance in the fluid, leading to a decline in the particle settling velocity. The mutual interference between particles will result in an increase in the drag force on the particles and a decline in the settling velocity. However, when the particles are aggregated, the settling velocity will increase. This study can provide theoretical guidance for predicting the migration law of cuttings during the drilling of horizontal wells, and it has important significance for enriching the theory of solid–liquid two-phase flow.

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Section: Transition Region and Turbulencementioning

confidence: 99%

A Review of the Settling Law of Drill Cuttings in Drilling Fluids

Hou,

Yuan,

Chen

et al. 2023

Processes

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“…(3) The variation in results provided a basis for the investigation of different-sized anaerobic granules which would lead to choosing the optimal size and weight of granules for a granule-based reactor. Recent studies on anaerobic granules mentioned that granulation in hybrid anaerobic reactors varies due to different microbial consortium thus leading to variation of shape and size in granules [38]. In addition, the weight of the granule represented the spatial dynamics of microbial communities in the granule.…”

Section: Weight Of the Granulementioning

confidence: 99%

Biogas Production and Fundamental Mass Transfer Mechanism in Anaerobic Granular Sludge

Afridi

Younas

2019

Sustainability

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Anaerobic granules are responsible for organic degradation and biogas production in a reactor. The biogas production is entirely dependent on a mass transfer mechanism, but so far, the fundamental understanding remains poor due to the covered surface of the reactor. The study aimed at investigating the fundamental mass transfer characteristics of single anaerobic granules of different sizes using microscopic imaging and analytical monitoring under single and different organic loadings. The experiment was conducted in a micro reactor and mass transfer was calculated using modified Fick’s law. Scanning electron microscopy was applied to observe biogas production zones in the granule, and a lab-scale microscope equipped with a camera revealed the biogas bubble detachment process in the micro reactor for the first time. In this experiment, the granule size was 1.32, 1.47, and 1.75 mm, but 1.75 mm granules were chosen for further investigation due to their large size. The results revealed that biogas production rates for 1.75 mm granules at initial Chemical Oxygen Demand (COD) 586, 1700, and 6700 mg/L were 0.0108, 0.0236, and 0.1007 m3/kg COD, respectively; whereas the mass transfer rates were calculated as 1.83 × 10−12, 5.30 × 10−12, and 2.08 × 10−11 mg/s. It was concluded that higher organic loading and large granules enhance the mass transfer inside the reactor. Thus, large granules should be preferred in the granule-based reactor to enhance biogas production.

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“…Since then, several studies extended the Stokes law by investigating the effects of additional parameters such as non-Newtonian media, particle shapes, nonzero Reynolds number, interactions between particles, and the effect of walls (e.g. [3,4,5,6,7,8,9,10]). When the concentration of particles is increased, the motion and the settling velocity of an individual sedimenting object is affected by the existence of the others: this leads to a decrease of the mean settling velocity of the suspension, due to the so-called hindering effect [11].…”

Section: Introductionmentioning

confidence: 99%