Capsule-Pipelining—An Improved Theoretical Analysis

Garg, V. K.

doi:10.1115/1.3448903

Cited by 7 publications

(3 citation statements)

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“…The average velocity and velocity profile in the annulus are postulated and a friction coefficient is used to estimate the drag on the capsule. The analysis of Garg (1977) allows the capsule to make an angle with the pipe wall and takes into account the solid-solid friction for a partially levitated capsule. The fundamental difficulty with this kind of analysis is that people do not understand how the capsule is suspended and tilted, and thus cannot estimate its equilibrium position and orientation in the pipe.…”

Section: Introductionmentioning

confidence: 99%

Dynamic simulation of the motion of capsules in pipelines

1995

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In this paper we report results of two-dimensional simulations of the motion of elliptic capsules carried by a Poiseuille flow in a channel. The numerical method allows computation of the capsule motion and the fluid flow around the capsule, and accurate evaluation of the lift force and torque. Results show that the motion of a capsule which is heavier than the carrying fluid may be decomposed into three stages: initial lift-off, transient oscillations and steady flying. The behaviour of the capsule during initial lift-off and steady flying is analysed by studying the pressure and shear stress distributions on the capsule. The dominant mechanism for the lift force and torque is lubrication or inertia or a combination of the two under different conditions. The lift-off velocity for the ellipse in two dimensions is compared with experimental values for cylindrical capsules in pipes. Finally, the mechanisms of lift for capsules are applied to flying core flows, and it is argued that inertial forces are responsible for levitating heavy crude oil cores lubricated by water in a horizontal pipeline.

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Section: Introductionmentioning

confidence: 99%

Dynamic simulation of the motion of capsules in pipelines

1995

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“…Garner et al [24], Kumar et al [25], and Markatos et al [26] studied the flow characteristics of both laminar and turbulent flows between a circular pipe and an eccentric moving cylindrical capsule. Garg [27], Ogawa et al [28], and Kroonenberg [29] introduced respective friction coefficients between the moving capsule wall and the pipe wall and established mathematical models of transporting a concentric cylindrical capsule within the pipelines. Flow characteristics of both the developing and the fully developed annular slit flows were estimated by Sud et al [30] and Tomita et al [31], through studying fundamental relationships between the turbulent flow and Von Karman's similarity hypothesis [24] in an idealized model of a highspeed ground transportation system.…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

Hydraulic Characteristics of Transporting a Piped Carriage in a Horizontal Pipe Based on the Bidirectional Fluid-Structure Interaction

Zhang

Sun

et al. 2018

Mathematical Problems in Engineering

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Energy shortage restricts the rapid development of the global transport industry. Trying to develop innovative modes of transport becomes an inevitable trend. Hydraulic Capsule Pipelines (HCPs) are the freight transportation modes that use a kind of fluid to push capsules filled with bulk solids materials through water-filled pipelines. HCPs not only alleviate everincreasing costs caused by energy scarcities and oil price up, but also solve issues like traffic congestion and environmental pollution. Published literature is mainly limited to numerical simulation of the unidirectional fluid-structure interaction between the capsules and the fluid inside the pipelines; furthermore, the hydraulic characteristics only involve the speed of the capsules and the pressure drop characteristics of the fluid within the pipe. This research was conducted on the following four aspects of HCPs. First, an improved cylindrical capsule called a “piped carriage” was evaluated. Second, an associated solution between the fluid domain within the pipe and the solid domain of the piped carriage was investigated numerically on the basis of the bidirectional fluid-structure interaction methods. Third, the effects of diameter ratio b (ratio of a diameter of the piped carriage De to a pipe diameter Dp, widely ranging in b=0.4~0.95) on hydraulic characteristics of transporting the piped carriage within the pipeline were extensively discussed. Finally, based on Least-Cost Principle, an optimization model of HCPs was effectively built. The results showed that the simulated results were in good agreement with the experimental results, which further indicated that it was feasible for solving the hydraulic characteristics of transporting the piped carriage by using the bidirectional fluid-structure interaction methods. The results will be of great reference value for further research on HCPs and also provide a theoretical foundation for the optimal design of HCPs.

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“…[12] Garg investigated the capsule velocity, shear force, pressure ratio variation, and friction factor of a single cylindrical capsule in a horizontal pipe. [13] Liu and Graze measured the pressure distribution around a stationary cylindrical capsule in a pipe. Their results were used to determine the lift and drag on the capsule.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the hydraulic characteristics of a coal log train in a pipe

Liu

et al. 2016

Can J Chem Eng

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The pressure distribution around two coal logs in tandem (a coal log train) flowing in a horizontal pipe (inner diameter of 50 mm) is experimentally studied. Experiments are conducted at three water velocities (0.92, 1.10, and 1.50 m/s; corresponding Reynolds numbers 45 771, 54 726, and 74 627, respectively). The hydraulic characteristics of the coal log train are analyzed, and the results are used to calculate the lift and drag forces together with the lift and drag coefficients. The pressure at the faces and surfaces of the coal log train increases at rising water velocity, enhancing the lift and drag forces. The forces acting on the first coal log are the largest, and forces on other coal logs decrease stepwise. The hydraulic characteristics of the first coal log are more complex than that of other coal logs. The lift and drag coefficients decrease with increasing water velocity. Both the lift and drag forces on individual coal logs are smaller than those on a single coal log in a pipe, when the coal logs follow one another. These results show the great difference in hydraulic characteristics between a coal log train and a single coal log in a pipe.

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Capsule-Pipelining—An Improved Theoretical Analysis

Cited by 7 publications

References 0 publications

Dynamic simulation of the motion of capsules in pipelines

Dynamic simulation of the motion of capsules in pipelines

Hydraulic Characteristics of Transporting a Piped Carriage in a Horizontal Pipe Based on the Bidirectional Fluid-Structure Interaction

Experimental study of the hydraulic characteristics of a coal log train in a pipe

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