ISSN:
0178-515X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Process Engineering, Biotechnology, Nutrition Technology
Notes:
Abstract Correlations for pressure drop in gas-liquid cocurrent downflow through packed beds are presented, taking into cognizance the flow pattern of the phases and covering a wide range in experimental conditions. Criteria for flow regime discrimination are presented separately for low porosity and for high porosity packings. List of Symbols dp effective particle diameter, m F (2ΔP lg /ρ l V2 l ) (dp/h), friction factor (−) g acceleration due to gravity, m s-2 G superficial mass velocity of gas, Kg m-2 s h height of the test section, m L superficial mass velocity of liquid, Kg m-2 s ΔP pressure drop, N m-2 V superficial velocity of the phase, m s-l Greek letters ɛ bed porosity (−) η (1−ɛ)2/ɛ3 μ viscosity, Kg m-1 s-1 ρ density, Kg m-3 σ l surface tension, Kg s-2 δ standard deviation Dimensionless parameters/groups M g μ4 l /ρ l σ3 l , Morton number Re l dp V l ρ l /μ1, Reynolds number for liquid Re g dp V g ρ g /μ g , Reynolds number for gas We l L 2 dp/ρ l , Weber number for liquid We g G 2 dp/ρ g , Weber number for gas φ√(Δp lg /Δp) Lockhart–Martinelli parameter X√(Δp l /Δp g) Lockhart–Martinelli parameter Ψ (σω/σ l ) [(μ l /μω) (ρω/ρ l )2]1/3, flow parameter Λ [(ρ g /ρair) (ρ l /ρω)]1/2, flow parameter Subscripts g gas phase l liquid phase lg two phase w water
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01767470
Permalink
