Critical impeller speed for solid suspension in turbine agitated contactors |
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Authors: | S Arvinth P Gangadhar Rao T Murugesan |
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Institution: | (1) Department of Chemical Engineering, Alagappa College of Technology, Anna University, 600 025 Madras, India;(2) Chemical Engineering Division, Central Leather Research Institute, 600020 Madras, India |
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Abstract: | The present study in solid-liquid contactors, an attempt has been made to calculate the minimum/critical impeller speed required for complete suspension of solids. A new correlation, involving Reynolds number, modified Froude number, along with the agitation characteristics is proposed. The effect of impeller geometry as well as impeller clearance are clearly established for 6-blade (flat) turbine agitated contactors.List of Symbols
B
Solid weight fraction (%)
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c
Clearance of the impeller from the tank bottom (m)
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d
P
Average particle size(m)
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d
R
Impeller diameter (m)
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d
T
Vessel diameter (m)
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g
Acceleration due to gravity m/sec2
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N
cs
Critical impeller speed (S–1)
Greek Letters
Kinematic viscosity m2/sec
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L
Density of liquid kg/m3
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S
Density of solid kg/m3
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![Delta](/content/kp305368622h6324/xxlarge916.gif)
Density difference between solid and liquid kg/m3 |
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Keywords: | |
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