Abstract
Basic physicochemical notions of foams as specific gas-liquid technological media are systematized. Structural properties, main parameters, and models of foam are considered. The adsorption-kinetic nature of the skeleton structure-forming phase of foam is discussed. Particular attention is given to the theoretical description of the internal hydrodynamics of foams, the concept of hydroconduction, and the syneresis phenomenon. Basic principles of rheological models of foams are discussed.
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Abbreviations
- a :
-
radius of equivalent bubble, m
- a s :
-
surface-averaged bubble radius, m
- ā :
-
average radius of bubbles in foam, m
- B :
-
number of edges (Plateau-Gibbs channels) of a foam cell
- b :
-
Plateau-Gibbs channel length, m
- C :
-
partial surfactant density in solution, kg/m3
- D :
-
diffusion coefficient, m2/s
- D s :
-
surface diffusion coefficient, m2/s
- E :
-
modulus of elasticity of an adsorption layer, N/m2
- E G :
-
Gibbs modulus of elasticity, N/m2
- E M :
-
Marangoni modulus of elasticity, N/m2
- F :
-
number of faces (films) of a foam cell
- j :
-
flux of substance toward the surface, kg/(m2 s)
- f(a):
-
bubble size distribution function
- G :
-
shear modulus, N/m2
- g:
-
vector of the acceleration of gravity, m/s2
- H :
-
kinetic hydroconductivity, m2/(Pa s)
- h :
-
film thickness, m
- h cr :
-
critical film thickness, m
- K :
-
foam ratio
- k :
-
Boltzmann constant, J/K
- M :
-
molecular weight of a surfactant
- N :
-
number of nodes of a foam cell; number of moles of surfactant in the system
- N s :
-
number of moles of a surfactant in an adsorption layer
- n :
-
number of characteristic sizes of bubbles in foam
- P a :
-
atmospheric pressure, N/m2
- P g :
-
pressure in the gas phase of foam, N/m2
- P 1 :
-
pressure in the liquid phase of foam, N/m2
- Q :
-
volumetric flow rate of foam through the gap between plates, m3/s
- q :
-
local volumetric liquid content flux density
- R b :
-
Plateau-Gibbs channel radius, m
- R n :
-
radius of curvature of nodal menisci, m
- R:
-
universal gas constant, J/(mol K)
- r 1 :
-
inlet radius of a foam breaker, m
- S :
-
surface area, m2
- S b :
-
cross-sectional area of a Plateau-Gibbs channel, m2
- T :
-
temperature, K
- t :
-
time, s
- t a :
-
adsorption relaxation time, s
- U :
-
translational velocity of foam in a column, m/s
- U:
-
local velocity of foam (or its skeleton phase), m/s
- V :
-
volume, m3
- V 1 :
-
mole fraction of the liquid phase
- V 10 :
-
liquid content of foam at the inlet of a foam breaker
- v:
-
liquid velocity, m/s
- vs :
-
surface liquid velocity, m/s
- x :
-
coordinate along the plate generatrix, normalized to the inlet radius
- Z :
-
vertical coordinate, m
- Z 0 :
-
steady-flow foam-column height, m
- z :
-
coordinate counted from the surface deep into the liquid, m
- α:
-
distribution function parameter
- β:
-
kinetic adsorption coefficient, s-1
- β1 :
-
kinetic desorption coefficient, m/s
- Γ:
-
surfactant adsorption, kg/m2
- gG∞ :
-
surfactant adsorption at the total occupation of an adsorption layer, kg/m2
- γ:
-
angle between the generatrix and axis of rotation, deg
- δ:
-
shear strain
- ε:
-
specific interface area of foam, m-1
- κ:
-
surface curvature, in-1
- μ:
-
dynamic viscosity of the liquid, kg/(m s)
- v:
-
kinematic viscosity of the liquid, m2/s
- Ξ:
-
potential of interaction of a surfactant molecule with the film surface
- ξ:
-
coordinate along the normal to the surface, m
- п:
-
wedging pressure, N/ m2
- ρ1 :
-
liquid density, kg/m3
- ρg :
-
gas density, kg/m3
- σ:
-
surface tension, N/ m2
- σ0 :
-
surface tension of a pure solvent, N/ m2
- τ:
-
shear stress, N/ m2
- τ0 :
-
ultimate shear stress, N/ m2
- Φ:
-
volumetric gas content of foam
- Ψ:
-
free energy, J
- ω:
-
angular velocity of the plates of a foam breaker; frequency, s-1
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Kazenin, D.A., Vyaz’min, A.V. & Polyanin, A.D. Foams as specific gas-liquid technological media. Theor Found Chem Eng 34, 211–226 (2000). https://doi.org/10.1007/BF02755969
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DOI: https://doi.org/10.1007/BF02755969