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Hydrodynamics of co-current downward liquid-liquid system with packing

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Abstract

The effect of packing and its voidage on the hydrodynamic characteristics of co-current downward liquid-liquid system (CCDLLS) was studied using water and three different oils (exxsol, kerosene and white oil). Two flow regimes, homogeneously dispersed oil regime and heterogeneously dispersed oil, were observed with the total pressure drop showing a minimum at the regime transition velocity. Depending on the packing, frictional pressure drop either shows a minimum or monotonically increases with water velocity. Low-density oil results in higher holdup and correspondingly higher frictional pressure drop. Higher dispersed phase holdup is obtained by using a low voidage packing. Semi-empirical/empirical equations are proposed to predict the frictional pressure drop and phase holdup.

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Abbreviations

dp :

diameter of packing [m]

D:

diameter of the column [m]

g:

acceleration due to gravity [m/s2]

L:

length of the test section [m]

Reo :

oil phase Reynolds number [dimensionless]

Rew :

water phase Reynolds number [dimensionless]

Suw :

suratman number of water [dimensionless]

uo :

interstitial velocity of oil [m/s]

uso :

superficial velocity of oil [m/s]

usw :

superficial velocity of water [m/s]

uw :

interstitial velocity of water [m/s]

Wew :

weber number of water \(\left( {{{{\rho _w}{\rm{u}}_w^2{\rm{D}}} \over {{\mu _w}}}} \right)\) [dimensionless]

μ*:

viscosity ratio (μ/μw) [dimensionless]

μ o :

viscosity of oil [Pa·s]

μ w :

viscosity of water [Pa·s]

α :

volume fraction of oil [dimensionless]

Δρ :

density difference between water and oil (ρwρo) [kg/m3]

Δσ :

interfacial tension between water and oil [N/m]

ε :

voidage of packed bed [dimensionless]

ρ m :

density of liquid-liquid mixture [kg/m3]

ρ o :

densityofoil[kg/m3]

ρ w :

densityofwater[kg/m3]

σ w :

surface tension of water [N/m]

φ s :

sphericity of packing [dimensionless]

CCDLLS:

co-current downward liquid-liquid system

AARE:

average absolute relative error

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Correspondence to Thiruvengadam Renganathan.

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Samdavid, S., Renganathan, T. & Krishnaiah, K. Hydrodynamics of co-current downward liquid-liquid system with packing. Korean J. Chem. Eng. 39, 86–95 (2022). https://doi.org/10.1007/s11814-021-0950-x

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  • DOI: https://doi.org/10.1007/s11814-021-0950-x

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