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Fundamental Issues and Canonical Flows

Numerical Simulation of Laminar Confined Radial Flow Between Parallel Circular Discs

[+] Author and Article Information
Nirmalendu Biswas1

Department of Mechanical Engineering,  Jadavpur University, Kolkata, 700 032, Indianirmalendubiswas@yahoo.co.in

Nirmal Kumar Manna, Achintya Mukhopadhyay, Swarnendu Sen

Department of Mechanical Engineering,  Jadavpur University, Kolkata, 700 032, India

1

Corresponding author.

J. Fluids Eng 134(1), 011205 (Feb 24, 2012) (8 pages) doi:10.1115/1.4005737 History: Received May 05, 2011; Revised December 30, 2011; Published February 23, 2012; Online February 24, 2012

In this work, a fluid jet is issued axially from a short, circular nozzle and then fed radially outward through the clearance of two parallel circular discs. The disc assembly was considered fully submerged within a fluid in a horizontal plane. Axisymmetric computational domain is chosen for the analysis considering steady, laminar flow. The numerical simulation is carried out by an in-house CFD code developed following the finite volume method and SIMPLER algorithm. The effects of flow rate and channel dimensions are analyzed to understand the characteristics of submerged radial flow. It is found that the flow field consists of several features like toroidal recirculation, annular separation bubble and flow reattachment, which are strongly influenced by the clearance between the two parallel discs and the flow rate.

Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 5

Velocity vector plot (a) Re = 200, (b) Re = 400, (c) Re = 1200, and (d) Re = 1800, for D = 45d, h/d = 0.54

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Figure 6

Velocity vector plot (a) Re = 200, (b) Re = 400, (c) Re = 1200, and (d) Re = 1800 for D = 45d, h/d = 1.08

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Figure 7

Velocity vector plot (a) Re = 400, (b) Re = 1200, (c) Re = 1600, and (d) Re = 1800, for D = 45d, h/d = 2.16

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Figure 15

(a) Height (hs /d) and (b) Length (rr /d) of the primary bubble at constant Re = 1800 with varying h/d

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Figure 1

Computational domain of radially outward flow geometry

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Figure 2

Stream line plot for grid independence study, (a) coarser mesh (185 × 215), (b) chosen mesh (240 × 280), (c) finer mesh (312 × 364) at h/d = 3.24, Re = 800, and (d) radial velocity profile at r/d = 11.518 for different mesh size

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Figure 3

Stream lines plot for validation, (a) h/d = 2, Re = 50, D = 45d (present result), (b) h/d = 2, Re = 50 (Fig. 6 of Ref. [6]), (c) h/d = 1, Re = 994, D = 45d (present result), (d) h/d = 1, Re = 994, (Fig. 7 of Ref. [7]), and (e) h/d = 1, Re = 994, (Fig. 6 of Ref. [7])

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Figure 4

Velocity vector plot (a) Re = 200, (b) Re = 400, (c) Re = 1200, and (d) Re = 1800 for D = 45d, h/d = 0.22

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Figure 8

Velocity vector plots (a) Re = 200, (b) Re = 400, (c) Re = 1200, (d) Re = 1800, (e) stream plot for D = 45d, h/d = 3.24 (f) stream plot for D = 65d, h/d = 3.24, Re = 1800

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Figure 9

Radial velocity distribution for h/d = 1.08 and different Re

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Figure 10

Radial velocity distribution for Re = 800 and different h/d ratio

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Figure 11

Radial velocity distribution for h/d = 0.22 at Re = 200

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Figure 12

Radial velocity distribution at h/d = 1.08 for different Re at r/d = 2.3415

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Figure 13

Effect of Pipe flow Re on the height of the separation bubble hs /d at constant h/d = 1.08, r/d = 2.345

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Figure 14

Effect of Pipe flow Re on flow reattachment point rr at h/d = 1.08 and with different Re

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