Slip velocity and hydrodynamic parameters in liquid-liquid spray columns

1989 ◽  
Vol 54 (4) ◽  
pp. 990-995
Author(s):  
Milan Sovilj
Keyword(s):  
Reynolds Number ◽  
Interfacial Tension ◽  
Slip Velocity ◽  
Dispersed Phase ◽  
Dimensionless Group ◽  
Hydrodynamic Parameters ◽  
Wide Range ◽  
Liquid Spray ◽  
Predicted Values ◽  
Good Agreement

An empirical correlation for the prediction of slip velocity in liquid-liquid spray columns, which includes a dimensionless group containing the interfacial tension, is presented. Good agreement between experimental and predicted values of slip velocity is obtained over a wide range of dispersed phase hold-up (0.97–36.2%) and Reynolds number (58-1067).

scholarly journals Modeling of Hydrodynamics in a 25 mm ϕ Pulsed Disk and Doughnut Column

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Rajnish Kumar ◽  
D. Sivakumar ◽  
Shekhar Kumar ◽  
U. Kamachi Mudali
Keyword(s):  
Slip Velocity ◽  
Drop Size ◽  
Absolute Error ◽  
Model Parameters ◽  
Dispersed Phase ◽  
Acid System ◽  
Hydrodynamic Parameters ◽  
Predicted Values ◽  
Experimental Values ◽  
Good Agreement

The hydrodynamic parameters, namely, dispersed phase holdup and flooding throughput, have been investigated in 25 mm diameter pulsed disk and doughnut column (PDDC), in no mass transfer conditions. In this work, using existing correlations on plate pulsed columns, the dispersed phase holdup and the flooding throughput are empirically modelled well using the slip velocity concept. A good agreement is observed between experimental values and predicted values obtained from empirical correlation. The experimental data for dispersed phase holdup and flooding throughput has been modelled using the Van Delden model to describe the hydrodynamics characteristics of a PDDC and necessary adjustable parameters for drop size distribution and dispersed phase holdup are updated for 30% TBP-nitric acid system. The model parameters were estimated by minimizing the absolute error between experimental and theoretical values of flooding throughput and holdup data. It was found that the measured values and observed trends could be described accurately using this model after fitting holdup and flooding data. The error between the experimental and theoretical values of flooding throughput and holdup was found to be less than 10%.

Improved Form of the k-ε Model for Wall Turbulent Shear Flows

1987 ◽  
Vol 109 (2) ◽  
pp. 156-160 ◽  
Author(s):  
Y. Nagano ◽  
M. Hishida
Keyword(s):  
Reynolds Number ◽  
Turbulent Flows ◽  
Plate Boundary ◽  
Wall Turbulence ◽  
Turbulent Shear ◽  
Committee Report ◽  
Low Reynolds Number Flows ◽  
Diffuser Flow ◽  
Wide Range ◽  
Predicted Values

An improved k-ε turbulence model for predicting wall turbulence is presented. The model was developed in conjunction with an accurate calculation of near-wall and low-Reynolds-number flows to meet the requirements of the Evaluation Committee report of the 1980–1981 Stanford Conference on Complex Turbulent Flows. The proposed model was tested by application to turbulent pipe and channel flows, a flat plate boundary layer, a relaminarizing flow, and a diffuser flow. In all cases, the predicted values of turbulent quantities agreed almost completely with measurements, which many previously proposed models failed to predict correctly, over a wide range of the Reynolds number.

Liquid side mass transfer coefficient and interfacial area at vertical liquid flow on expended metal sheet packing

1980 ◽  
Vol 45 (11) ◽  
pp. 3089-3100 ◽  
Author(s):  
Zdeněk Brož ◽  
Mirko Endršt
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Liquid Flow ◽  
Empirical Relation ◽  
Interfacial Area ◽  
Expanded Metal ◽  
Wide Range ◽  
Predicted Values ◽  
Good Agreement

Prediction of the liquid side mass transfer coefficient k1 at vertical liquid flow on the expanded metal packing is based on the penetration model according to Higbie. The experimental value of mass transfer coefficient k1 at absorption of sparingly soluble gases with differing diffusivities in water (propane, carbon dioxide and helium) are in a good agreement with the predicted values in a wide range of linear wetting densities. Interfacial area is determined by the chemical method and is correlated by an empirical relation.

Solubility of Niobium(V) under Cementitious Conditions: Importance of Ca-niobate

2004 ◽  
Vol 824 ◽  
Author(s):  
Caterina Talerico ◽  
Michael Ochs ◽  
Eric Giffaut
Keyword(s):  
Solid Phase ◽  
Empirical Relation ◽  
Oxide Phase ◽  
X Ray Diffraction ◽  
Ph Values ◽  
Wide Range ◽  
Ph Conditions ◽  
Predicted Values ◽  
Ph Range ◽  
Good Agreement

AbstractThe solubility of niobium was investigated for Ca and pH conditions relevant for cementequilibrated solutions. For the pH range considered (9.5-13.2), the dissolved Nb concentration decreases with increasing pH. Overall, experiments lead to Nb concentrations between 2·10-5 M and 2·10-9 M. For all pH values, the dissolved Nb concentration also decreases systematically with increasing Ca concentration. X-ray diffraction measurements of selected experiments confirmed the presence of a solid Ca-Nb-oxide phase, with CaNb4O11·8H2O (hochelagaite) being the most likely composition. On the basis of these findings an empirical regression model for the prediction of Nb solubility data as a function of pH and Ca concentration was derived. This empirical relation is consistent with the presence of a solubility limiting Ca-Nb solid phase and permits to predict aqueous Nb solubility values in cementitious environments over a relatively wide range of conditions. Predicted values are in good agreement with independent experimental results.

A Thermodynamic Analysis of the Rich Flammability Limits of Fuel-Diluent Mixtures in Air

1995 ◽  
Vol 117 (3) ◽  
pp. 239-242 ◽  
Author(s):  
S. O. Bade Shrestha ◽  
I. Wierzba ◽  
G. A. Karim
Keyword(s):  
Atmospheric Temperature ◽  
Flammability Limit ◽  
Flammability Limits ◽  
Wide Range ◽  
Temperature And Pressure ◽  
The Rich ◽  
Predicted Values ◽  
Experimental Values ◽  
Good Agreement ◽  
Propane Butane

A simple approach is described for the calculation of the rich flammability limits of fuel-diluent mixtures in air for a wide range of initial temperatures based only on the knowledge of the flammability limit of the pure fuel in air at atmospheric temperature and pressure conditions. Various fuel-diluent mixtures that include the fuels methane, ethylene, ethane, propane, butane, carbon monoxide, and hydrogen, and the diluents nitrogen, carbon dioxide, helium, and argon have been considered. Good agreement is shown to exist between predicted values of the rich flammability limits and the corresponding available experimental values for the fuel-diluent mixtures.

A Thermodynamic Analysis of the Lean Flammability Limits of Fuel-Diluent Mixtures in Air

1994 ◽  
Vol 116 (3) ◽  
pp. 181-185 ◽  
Author(s):  
I. Wierzba ◽  
S. O. Bade Shrestha ◽  
G. A. Karim
Keyword(s):  
Thermodynamic Analysis ◽  
Initial Mixture ◽  
Flammability Limits ◽  
Temperature Range ◽  
Gaseous Fuels ◽  
Wide Range ◽  
Predicted Values ◽  
Experimental Values ◽  
Good Agreement

A procedure is described for calculating the lean flammability limits of fuel-diluent mixtures in air over a wide range of fuel-diluent combinations and for different initial mixture temperatures. Good agreement is shown to exist between the predicted values of the limits with the corresponding experimental values for some common gaseous fuels that include CH4, C2H6, C2H4, C3H8, C4H10, H2, and CO and the diluents CO2, N2, He, and Ar over the temperature range of −60°C up to 400°C.

Horizontal Penetration of Gas-Liquid Spray Jets in Gas-Solid Fluidized Beds

2004 ◽  
Vol 2 (1) ◽  
Author(s):  
Siva Ariyapadi ◽  
Franco Berruti ◽  
Cedric Briens ◽  
Jennifer McMillan ◽  
David Zhou
Keyword(s):  
Momentum Flux ◽  
Fluidized Beds ◽  
Nozzle Geometry ◽  
Two Phase ◽  
Gas Jets ◽  
Wide Range ◽  
Liquid Spray ◽  
Jet Penetration ◽  
Nozzle Geometries ◽  
Good Agreement

A new method has been developed to predict the horizontal jet penetration of gas-liquid sprays injected into gas-solid fluidized beds. The technique involves combining a theoretical model to predict the momentum flux of two-phase sprays with the Benjelloun et al. (1995) correlation for gas jets. Following this treatment, a generalized version of the jet penetration correlation has been developed, which includes the effect of nozzle geometry. The correlation predictions are in very good agreement with the experimental data for a wide range of nozzle geometries, nozzle scales, and jet fluids.

Fluid Flow Characteristics in Microchannels With Rib-Patterned Surface

2011 ◽  
Author(s):  
Toru Yamada ◽  
Chungpyo Hong ◽  
Otto J. Gregory ◽  
Mohammad Faghri
Keyword(s):  
Reynolds Number ◽  
Friction Factor ◽  
Flow Characteristics ◽  
Single Crystal Silicon ◽  
Working Fluid ◽  
Patterned Surfaces ◽  
Crystal Silicon ◽  
Wide Range ◽  
Fluid Flow Characteristics ◽  
Good Agreement

The effects of rib-patterned surfaces and surface wettability on liquid flow in microchannels were experimentally investigated in this study. Microchannels were fabricated on single-crystal silicon wafers by photolithographic and wet-etching techniques. Rib structures were patterned in the silicon microchannel, and the surface was chemically treated by trichlorosilane to create the hydrophobic condition. Experiments with water as the working fluid were performed with these microchannels over a wide range of Reynolds number between 110 and 1914. The results for the rib-patterned microchannels showed that the friction factor with the hydraulic diameter based on the rib-to-upper-wall height was lower than that for the incompressible theory with the same height. The friction factor-Reynolds number products for the hydrophobic condition increased as Reynolds number increased in the laminar flow regime. The experimental results were also compared with the predictive expressions from the literature, and it was found that the experimental data for the small rib/cavity geometry was in good agreement with those in the literature.

Friction Reduction in Turbulent Journal Bearings by Highpolymers

1980 ◽  
Vol 102 (4) ◽  
pp. 439-444 ◽  
Author(s):  
H. Fukayama ◽  
M. Tanaka ◽  
Y. Hori
Keyword(s):  
Reynolds Number ◽  
Turbulent Flow ◽  
Polymer Solution ◽  
Friction Factor ◽  
Polymer Concentration ◽  
Journal Bearings ◽  
Friction Reduction ◽  
Dilute Polymer Solutions ◽  
Wide Range ◽  
Good Agreement

The friction reduction by dilute polymer solutions is investigated experimentally in turbulent journal bearings. The effects of polymer substances, polymer concentration, bearing clearance, and journal eccentricity on friction reduction are examined over the wide range of Reynolds number in the superlaminar regime. In the experiments, the friction of polymer solution is less than 40 percent of that of Newtonian turbulent flow under the best conditions. The calculated friction factor for the Couette flow is in good agreement with the corresponding measured one. Degradation of highpolymer is also investigated experimentally, and is found to be affected by polymer concentration.

Ultra-Low Interfacial Tension of a Surfactant under a Wide Range of Temperature and Salinity Conditions for Chemical Enhanced Oil Recovery

2018 ◽  
Vol 55 (3) ◽  
pp. 252-257 ◽  
Author(s):  
Derong Xu ◽  
Wanli Kang ◽  
Liming Zhang ◽  
Jiatong Jiang ◽  
Zhe Li ◽  
...  
Keyword(s):  
Interfacial Tension ◽  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Wide Range ◽  
Low Interfacial Tension
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