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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Simulation of collagen solution flow in rectangular capillary
 Kysela, Bohuš ; Skočilas, J. ; Zitny, R. ; Stancl, J. ; Houska, M. ; Landfeld, A.
The viscoelastic properties of foods and polymers can be evaluated from flow of the material in capillary with specified dimension and shape. The extrusion rheometer equipped by capillary with rectangular cross-section was used for determination of the rheological behaviour of water collagen solution. The measurements of the axial profiles in longitudinal direction of the total stresses at capillary wall were performed for various shear rates. The linear viscoelastic model of Oldroyd B type: White-Metzner model was used for simulation of fluid flow in OpenFOAM software package. The simulations describe the effect of relaxation time on wall total stress in convergent-divergent capillary.
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Simulation of flow and dissipation of turbulent kinetic energy in an agitated vessel
 Kysela, Bohuš ; Skočilas, J. ; Konfršt, Jiří ; Chára, Zdeněk
Velocity field and distribution of dissipation rate are key parameters for design of mixing apparatuses. In this contribution we compared the CFD (Computational Fluid Dynamics) calculations with results of mean ensemble-averaged velocities measured by LDA (Laser Doppler Anemometry) and with results of derived dissipation rates where the total dissipation rate was used as control value. The comparison showed that the neither k-ε model (based on isotropic turbulence) nor RSM (Reynolds Stress Model) did not calculate the velocities in regions where the trailing vortices are developed (near impeller blade edges etc.) and in a region of main stream of the impeller where the flow is strongly anisotropic quite accurately. Similar discrepancies were observed for the dissipation rate; moreover the lower values of dissipation rate are also calculated in bulk volume of mixing vessel. Generally, the total dissipation rate results from the CFD calculations are lower then the real values. This is in an agreement with other published results.
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