Numerical Analysis of Convective Transport of Fly Ash-Water Slurry through a Horizontal Pipe

The transportation of the solid material using hydraulic transportation method is economically the best method. The head loss occurs during transportation of slurry through horizontal pipelines usually depends on the rheological behavior of slurry, slurry concentration, particle size, and influx velocity. An experimental investigation has been performed using sand-water slurry flowing through the horizontal pipe section of a pilot plant test loop. The head loss obtained from the experimental results was validated through CFD simulation using FLUENT. The solid concentration of sand-water slurry and influx velocity used during both experiments and numerical simulation were in the range of 10-40% (by weight) and 1 to 4 m/s respectively. The numerical simulations were performed using five different turbulence models and the results obtained using SST k-omega model was in close agreement with experimental results. It is observed from both the experiment and numerical analysis that the pressure loss, granular pressure, volume fraction and skin fraction coefficient during transportation of slurry through a horizontal pipe is a function of solid concentration and influx velocity. The present study observed that as the flow velocity increases four times, the pressure loss is increasing more than 10 times. Uniform volume fraction at middle zone of outlet of the pipe is observed as both the slurry concentration and velocity of flow increases.

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Numerical Analysis of Combined Free and Forced Laminar Convection of Liquid Metals in a Horizontal Pipe.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B ◽

10.1299/kikaib.58.3382 ◽

1992 ◽

Vol 58 (555) ◽

pp. 3382-3388

Author(s):

Mei WANG ◽

Toshihiro TSUJI ◽

Yasutaka NAGANO

Keyword(s):

Numerical Analysis ◽

Liquid Metals ◽

Horizontal Pipe ◽

Laminar Convection

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The Design of Electrostatic Precipitation for the Home Heating Boiler with Fine Coal Water Slurry Combustion

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.726-731.1972 ◽

2013 ◽

Vol 726-731 ◽

pp. 1972-1976 ◽

Cited By ~ 1

Author(s):

Li Jun Nie ◽

Yang Liu ◽

Mei Huang

Keyword(s):

Fly Ash ◽

Electrostatic Precipitation ◽

Emission Standard ◽

Dust Collection ◽

Water Slurry ◽

Fine Coal ◽

Home Heating ◽

Coal Water Slurry ◽

Tube Type ◽

Heating Boiler

The coal-water slurry produced with Datong coal was tested in a home boiler for heating. The experiment results of dust collection with the new tube type electrostatic precipitation of fly ash of coal water slurry combustion fit the emission standard of air pollutants for boilers (GB 13271-2001). The parameters for the electrostatic precipitation are as follows: the drift velocity of fly ash of coal water slurry combustion, 10.39 cm/s, the number of the tube, 64, the size of the tube, 25.6cm×25.6cm×20cm, the power, 0.24kW.

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Study of pipeline transportation of dense fly ash-water slurry

Fuel and Energy Abstracts ◽

10.1016/s0140-6701(03)81600-4 ◽

2003 ◽

Vol 44 (3) ◽

pp. 136

Keyword(s):

Fly Ash ◽

Pipeline Transportation ◽

Water Slurry

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A numerical analysis of vortex shedding within a confined channel flow

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1243/0954406991522716 ◽

1999 ◽

Vol 213 (5) ◽

pp. 477-490 ◽

Cited By ~ 4

Author(s):

T. J. Scanlon ◽

M. T. Stickland ◽

A Oldroyd

Keyword(s):

Numerical Analysis ◽

Channel Flow ◽

Vortex Shedding ◽

Convective Transport ◽

Fully Implicit ◽

Order Scheme ◽

Computational Fluid Dynamics Cfd ◽

Vortex Shedding Frequency ◽

Higher Order Scheme ◽

Confined Channel

The numerical analysis of two-dimensional laminar vortex shedding from a rectangular cylinder within a confined channel flow is presented. This study, carried out using a computational fluid dynamics (CFD) code based on the SIMPLEST algorithm, considers the influence of numerical diffusion on the prediction of the vortex shedding frequency. The computational analysis compares the commonly used first-order accurate UPWIND scheme with the well-known third-order scheme QUICK and its derivative SMART, used for the discretization of convective transport. For the temporal differencing, a fully implicit scheme has been adopted. Plots of Strouhal number against Reynolds number suggest that the implementation of a higher-order scheme is beneficial for the accurate capture of the vortex shedding transient in unsteady flows of this nature.

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