Wall effects on terminal falling velocity of spherical particles moving in a Carreau model fluid
-
Jaroslav Strnadel
,
Miloslav Simon
Abstract
Experimental verification of our previous numerical simulation of wall effects on the terminal falling velocity of spherical particles moving slowly along the axis of a cylindrical vessel filled with a Carreau model fluid is presented. Dependences of the wall correction factor F W on the sphere to tube ratio d/D and on the dimensionless Carreau model parameters m, Λ, and η r were obtained using a finite element method. Calculated data of the wall correction factor were compared with the results of our new falling sphere experiments. The experiments were carried out in six types of cylindrical Perspex columns (16 mm, 21 mm, 26 mm, 34 mm, 40 mm, and 90 mm in diameter) filled with aqueous solutions of polymers exhibiting different degrees of shear thinning and elasticity. Seventeen types of spherical particles (1–8 mm in diameter) made of glass, ceramics, steel, lead, and tungsten carbide were used for the drop tests. Measurements of the liquid flow curves, primary normal stress differences, oscillatory, creep and recovery, stress relaxation, and stress growth tests were carried out on the rheometer Haake MARS (Thermo Scientific). A good agreement between numerically and experimentally obtained F W data was found.
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© 2011 Institute of Chemistry, Slovak Academy of Sciences
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Articles in the same Issue
- Mechanisms controlling lipid accumulation and polyunsaturated fatty acid synthesis in oleaginous fungi
- Predicting retention indices of aliphatic hydrocarbons on stationary phases modified with metallocyclams using quantitative structure-retention relationships
- New SPME fibre for analysis of mequinol emitted from DVDs
- Continuous production of citric acid from raw glycerol by Yarrowia lipolytica in cell recycle cultivation
- Enhancing the production of gamma-linolenic acid in Hansenula polymorpha by fed-batch fermentation using response surface methodology
- Process characteristics for a gas—liquid system agitated in a vessel equipped with a turbine impeller and tubular baffles
- Kinetic study of pyrolysis of waste water treatment plant sludge
- Transport phenomena in an agitated vessel with an eccentrically located impeller
- Membrane extraction of 1-phenylethanol from fermentation solution
- Theoretical study on transesterification in a combined process consisting of a reactive distillation column and a pervaporation unit
- Wall effects on terminal falling velocity of spherical particles moving in a Carreau model fluid
- The effect of the physical properties of the liquid phase on the gas-liquid mass transfer coefficient in two- and three-phase agitated systems
- Effectiveness of nitric oxide ozonation
- Modelling of nanocrystalline iron nitriding process — influence of specific surface area
- Effect of CeO2 and Sb2O3 on the phase transformation and optical properties of photostable titanium dioxide
- Carnauba wax microparticles produced by melt dispersion technique
- Complexation studies of 3-substituted β-diketones with selected d- and f-metal ions
- Influence of the solvent donor number on the O/W partition ratio of Cu(II) complexes of 1,2-dialkylimidazoles
- Continuous dialysis of sulphuric acid in the presence of zinc sulphate
- Differences in affinity of arylstilbazolium derivatives to tetraplex structures
- Fast ferritin immunoassay on PDMS microchips
