The voidage problem in gas-electrolyte dispersions |
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Authors: | H Vogt |
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Affiliation: | (1) Fachbereich Verfahrens- und Umwelttechnik, Technische Fachhochschule Berlin, D-1000 Berlin 65, Germany |
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Abstract: | Assessing the ohmic interelectrode resistance of electrochemical reactors with gas evolution requires data for the gas void fraction of gas-electrolyte dispersions. A voidage equation is derived taking account of the internal liquid flow in stationary electrolytes and at small liquid superficial velocities. The equation is a general form of available voidage equations.Nomenclature
C
non-dimensional constant, Equation 8
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n
exponent, Equation 5
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S
cross-sectional area (m2)
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v
G
gas velocity (m s–1)
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v
L
liquid velocity (m s–1)
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v
s
rising velocity of a bubble swarm (m s–1)
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v
l
terminal rising velocity of a single bubble (m s–1)
- VG
volume flow rate of gas (m3 s–1)
- VL
volume flow rate of liquid (m3 s–1)
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fraction of cross-sectional area
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volume (void) fraction of gas
- m
geometric maximum of void fraction
- ![epsi](/content/p143t615442p5177/xxlarge949.gif)
maximum of void fraction in infinite gas flow
Indices i
internal
- t
total |
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Keywords: | |
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