A review of CFD modelling studies on pneumatic conveying and challenges in modelling offshore drill cuttings transport

Manjula, E.V.P.J.; Ariyaratne, W. K. Hiromi; Ratnayake, Chandana; Melaaen, Morten C.

doi:10.1016/j.powtec.2016.10.026

Cited by 85 publications

(46 citation statements)

References 91 publications

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“…where  rec -loss factor, depended on the type of receiver;  rec =  a = 1.2 kg/m 3air density at the receiver inlet, kg/m 3 ; v rec -air velocity in the receiver, m/s. In the equipment in question, a receiving device of the "Nozzle" type is selected, for which  rec = 0.7 [9].…”

Section: Pressure Drop Calculationmentioning

confidence: 99%

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Justification of the parameters of a pneumatic conveyor for active ventilation of soybean during storage

2019

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The article proposes a methodology for studying the productivity (capacity) and power consumption of a pneumatic conveyor for active ventilation of soybeans in container-modular storage in farms and the factors affecting them. In determining the parameters of the pneumatic conveyor, the physical and technological characteristics of the grain (soybean) are taken into account. The proposed methodology is based on the method of classical calculation for selecting a pneumatic conveyor with nominal parameters, which is necessary not only for transportation, both vertically and horizontally, but also for active ventilation of grain in containers during storage. The purpose of the methodology is to select a specific pneumatic conveyor for container-modular equipment for soybeans storage in the conditions of farms in Kazakhstan.

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Section: Pressure Drop Calculationmentioning

confidence: 99%

“…where G -conveyor capacity, t/h; i -pressure drop corresponding to the acceleration of 1 ton of material in the initial section of the pipeline [9,10], Pa/(t/h), given by:…”

Section: Pressure Drop Calculationmentioning

confidence: 99%

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Justification of the parameters of a pneumatic conveyor for active ventilation of soybean during storage

2019

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“…1,2,3 Therefore, the bottom hole has been a concern for drilling operations which is resulted in excessive well construction expenditure. 4 Bottom Hole Assembly (BHA), drill pipe rotary speed (RPM), flow rate, rate of penetration (ROP) and drilling fluid properties and inclination are the common factors that can be manipulated and controlled to gain a proper hole . 5 Since the investigation and study of the effective drilling characteristics on the bottom hole on a drilling rig is costly, researchers have attempted to study this subject with a variety of approaches such as flow loops and Computational Fluid Dynamics (CFD).…”

Section: Introductionmentioning

confidence: 99%

A Liquid-Solid Two-phase Flow Computational Fluid Dynamic Modelling of the Operational Characteristics Effects on the Cleaning Time of a Circulating Flow Loop

Dehvedar¹,

Moarefvand²,

Kiyani³

2019

S.Afr.j.chem.

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Flow loops and computational fluid dynamics are the main research approaches for resolving the hole-cleaning problems. Cutting transport phenomena can be considered as a Computational Fluid Dynamic (CFD) model by using Eulerian assumptions for the turbulent liquid-solid flow in concentric annuli. The effect of time along with the main operational characteristics on the hole-cleaning phenomena is not negligible but recent studies have had paid little attention to it. Poor near bit cleaning causes many problems such as bit balling, decline in the rate of penetration, pipe sticking, etc. In addition to the effect of inclination, drill pipe rotary speed, cutting size, nozzle velocity and fluid viscosity as well as the effect of the bit nozzle arrangement on the cutting transport process were discussed. The results demonstrate that at a critical inclination angle of 30 degrees the cutting transport is inefficient. For all sections, the effect of drill pipe rotary speed was negligible at high velocities. In the horizontal section, at low flow rates and high drill pipe rotation speeds, Newtonian viscous fluids or water has no effect on the time needed for initial holecleaning but by removing the drill pipe rotation speed in similar conditions, a dramatic influence on time is observed. In inclined annuli, increasing the cuttings size and decreasing the nozzle velocity result in having no cutting in the output. Under critical inclination (30 degrees) the effect of the nozzle angle pattern on the hole-cleaning time is negligible. However, for a vertical annulus, the nozzle angle significantly influences the cutting transport. The best performance is obtained when the nozzle angle was perpendicular to the drill pipe axes. Figure 1 (a) Flow Loop sketch and its similarity with a real well. Four nozzles (b) and cutting inlet were located on the right-hand side and one outlet was located on the left side. The drilling fluid was pumped through the drill pipe and then came into the annulus with the nozzles to remove the initial cuttings that were injected through the cutting inlet (c).

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“…Several modelling studies have been performed previously for vertical pneumatic conveyors (Manjula et al, 2017). Azizi et al (2012) studied dense to dilute gassolid flow behavior in a vertical pneumatic conveyor.…”

Section: Introductionmentioning

confidence: 99%

Euler-Granular approach for modelling of dilute phase pneumatic conveying in a vertical pipe

Welahettige

Ariyaratne

Melaaen

2017

Linköping Electronic Conference Proceedings

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In the present study, vertically upward dilute phase pneumatic conveying flow was predicted using EulerGranular method. Three dimensional computational fluid dynamics simulations were carried out for an 8 m long and 30.5 mm diameter circular pipe. The density of conveyed materials was 1020 kg/m 3 . Simulations for different particle diameters; 200 µm and 500 µm were performed. The air velocities ranged from 9 to 17 m/s and solid to air mass flow ratios ranged from 0.0 to 3.8. Pressure drop, air and particle velocity profiles and solid distribution profiles were studied and some of the results were compared with experimental data from existing literature. Predicted pressure drop and air velocity profiles are in good agreement with experimental results.

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A review of CFD modelling studies on pneumatic conveying and challenges in modelling offshore drill cuttings transport

Cited by 85 publications

References 91 publications

Justification of the parameters of a pneumatic conveyor for active ventilation of soybean during storage

Justification of the parameters of a pneumatic conveyor for active ventilation of soybean during storage

A Liquid-Solid Two-phase Flow Computational Fluid Dynamic Modelling of the Operational Characteristics Effects on the Cleaning Time of a Circulating Flow Loop

Euler-Granular approach for modelling of dilute phase pneumatic conveying in a vertical pipe

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