Mathematical model of the entry length in the flow of suspensions of solid particles in a gas |
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Authors: | A Lodes O Mierka J Mi?ák |
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Institution: | (1) Department of Chemical Engineering Faculty of Chemical Technology, Slovak Technical University, Jánska 1, SSR-812 37 Bratislava, SSR |
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Abstract: | A mathematical model consisting of equations of mass and momentum and for the velocity field has been used for computing the entry length of the flow of non-Newtonian fluids in laminar, transition and turbulent regions. Experimental data measured in a vertical flow of a suspension of solid particles in air have been used for verifying the predictions.
n
flow index for laminar flow
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Re
Reynolds number defined for the flow of the carrier medium
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q
exponent for turbulent flow
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ratio of core radius with a flat velocity profile to pipe radius
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c
ratio of the axial component of local velocity in the core to mean velocity
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w
mean flow velocity
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ratio of axial distance from the pipe entrance to the pipe radius
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ratio of the entrance length to the pipe radius
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relative mass fraction of particles
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ratio of the distance from the pipe wall to the pipe radius
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coefficient of pressure loss due to friction |
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Keywords: | Suspension entry length velocity profile solid particle gas |
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