Turbulent flow around single concentric long capsule in a pipe

Khalil, M.F.; Kassab, Sadek Z.; Adam, Ihab G.; Samaha, Mohamed A.

doi:10.1016/j.apm.2009.10.014

Cited by 19 publications

(19 citation statements)

References 18 publications

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“…In the results measured by Liu and Graze, [28] the place where the variation of pressure is great is also the location of the coal log. When they measured the pressure, the coal log was fixed on the pipe, similar to the case of t ¼ 0.01 s. Figure 9 compares the pressure distribution at the coal log surface over time with the pressure measured by Liu and Graze [28] and the simulation data of Khalil et al [3] The operating conditions of their studies are listed in Table 3. At t ¼ 0.01 s, the pressure at the upstream end of the coal log is nearly equal to the pressure of the inlet.…”

Section: Model Validationmentioning

confidence: 98%

“…[10] Khalil et al built a dynamic model of turbulent flow around a single long capsule situated in a concentric position using the commercial software FLUENT 6.3 by directly setting the capsule velocity. [3] Based on Fluent, Asim et al also obtained a numerical solution governing the turbulent flow around a concentric cylindrical capsule. [11] The geometries of the capsule models and pipes of these studies are listed in Table 1.…”

Section: Literature Reviewmentioning

confidence: 98%

“…[1] Liu and Marrero invented the CLP technique and obtained a U.S. patent. [2] In 1991, the Capsule Pipeline Research Center (CPRC) at the University of Missouri Columbia was established [3] to study the CLP technique. Much basic research work was conducted by Liu and his coworkers to study various hydrodynamics issues, the effect of polymer additives, unsteady capsule flow, wear on coal logs, coal log manufacturing, and the state of technical development.…”

Section: Introductionmentioning

confidence: 99%

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CFD simulation of the unsteady flow of a single coal log in a pipe

Liu

et al. 2015

Can J Chem Eng

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This study proposes a numerical simulation of the unsteady turbulent flow of a single coal log in a pipe using a dynamic mesh method. An eccentric two-dimensional dynamic model is developed in FLUENT 6.2. The model contains a straight section and a bent section. Comparisons of the coal log velocity and the pressure distributions of the pipe and the coal log surface are made between the calculated results and the experimental data. The shear force and the friction coefficient are also calculated to verify changes of the influence of water on the coal log. The results of this simulation display the dynamic motion of the coal log for startup and turning. Water drag force moves the coal log, making the coal log velocity greater than the water velocity. The lifting force lifts the coal log and moves its tail slightly upward. The pressure drop of the whole pipe is respectively larger in the presence of the coal log. The pressure along the coal log surface slowly declines. The appearance of a bend impedes the motion of the coal log and enhances abrasion. The coal log has difficulty being suspended due to decreased lifting force and increased friction. The pressure on the coal log surface rises.

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Section: Model Validationmentioning

confidence: 98%

Section: Literature Reviewmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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CFD simulation of the unsteady flow of a single coal log in a pipe

Liu

et al. 2015

Can J Chem Eng

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“…A practical range of inlet flow velocities have been considered here, corresponding to a 100mm diameter pipeline, as considered by many other researchers [9,[18][19][20][21][22][26][27][28]. All the walls in the flow domain have been modelled using no-slip boundary condition, as is expected in real world scenarios [38][39].…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…These pressure drops have already been defined in equation (5)(6)(7)(8)(9), were λ w can be found by the Moody's approximation as [52]: (26) and Ω w has been found out to be:…”

Section: Total Pressure Dropmentioning

confidence: 99%

Development of a design methodology for hydraulic pipelines carrying rectangular capsules

Asim

Mishra

Abushaala

et al. 2016

International Journal of Pressure Vessels and Piping

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The scarcity of fossil fuels is affecting the efficiency of established modes of cargo transport within the transportation industry. Efforts have been made to develop innovative modes of transport that can be adopted for economic and environmental friendly operating systems. Solid material, for instance, can be packed in rectangular containers (commonly known as capsules), which can then be transported in different concentrations very effectively using the fluid energy in pipelines. For economical and efficient design of such systems, both the local flow characteristics and the global performance parameters need to be carefully investigated. Published literature is severely limited in establishing the effects of local flow features on system characteristics of Hydraulic Capsule Pipelines (HCPs). The present study focuses on using a well validated Computational Fluid Dynamics (CFD) tool to numerically simulate the solid-liquid mixture flow in both on-shore and off-shore HCPs applications including bends. Discrete Phase Modelling (DPM) has been employed to calculate the velocity of the rectangular capsules. Numerical predictions have been used to develop novel semi-empirical prediction models for pressure drop in HCPs, which have then been embedded into a robust and user-friendly pipeline optimisation methodology based on Least-Cost Principle.

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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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Turbulent flow around single concentric long capsule in a pipe

Cited by 19 publications

References 18 publications

CFD simulation of the unsteady flow of a single coal log in a pipe

CFD simulation of the unsteady flow of a single coal log in a pipe

Development of a design methodology for hydraulic pipelines carrying rectangular capsules

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

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