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Edge Effects in Rotational Viscometry II. ZZ (Couette) and KK (Coaxial Morse Cones) Sensors, No-slip Pseudosimilarity
Wein, Ondřej
2004 - English
This report is actually deals with corrections of edge effects for a wide spectrum of rotational viscometers with the cylinder-cylinder measuring sections. Tato zpráva udává korekce na hranové efekty pro široké spektrum rotačních viskozimetrů s měřicí sekcí válec-válec.
Keywords:
rotational viscometry; edge effects; newtonian media
Available at various institutes of the ASCR
Edge Effects in Rotational Viscometry II. ZZ (Couette) and KK (Coaxial Morse Cones) Sensors, No-slip Pseudosimilarity
This report is actually deals with corrections of edge effects for a wide spectrum of rotational viscometers with the cylinder-cylinder measuring sections....
Edge Effects in Rotational Viscometry. I. Cylinder - Cylinder (Couette) System, Newtonian Media
Wein, Ondřej; Večeř, Marek
2004 - English
Exact calibration factors for a series of commercially available rotational viscometers are determined by solving the related elliptic boundary-value problem for the rotational flow of Newtonian media under zero Reynolds number (creeping flow approximation). In particular, the edge-effect correction for the Z40 DIN sensor (coaxial cylinders) should be 1.085 instead of incorrect 1.100, given in the related international standard ISO 3219 (Coaxial cylinders for liquids of medium viscosity). The edge-effect correction was determined also for a new KK sensor (coaxial Morse cones) in dependence of the adjustable gap thickness. Přesné kalibrační konstanty u řady komerčně vyráběných viskozimetrů jsou stanoveny řešením odpovídajících okrajových úloh pro rotační tok newtonských kapalin s Reynoldsovým číslem nižším než nula (aproximace toku). Korekce na hranové efekty pro sensor Z40 DIN (koaxiální válce) by však místo nesprávné hodnoty 1.000 (uvedené v normě ISO 3219 (koaxiální válce pro kapaliny se střední viskozitou) měla být 1.085. Korekce hranových efektů byla určena také pro nový KK senzor (koaxiální Morse kužel).
Keywords:
rotational viscometry; newtonian media; edge correction
Available at various institutes of the ASCR
Edge Effects in Rotational Viscometry. I. Cylinder - Cylinder (Couette) System, Newtonian Media
Exact calibration factors for a series of commercially available rotational viscometers are determined by solving the related elliptic boundary-value problem for the rotational flow of Newtonian media ...
Rotational Viscometry under Presence of Apparent Slip at Walls. VII. Torque and axial thrust in parallel-plate viscometer
Wein, Ondřej
2003 - English
An exact theory of the viscometric flow in the parallel-plate rheometer is analyzed numerically for the microdisperse liquids displaying apparent wall slip effect.
Keywords:
viscometry; normal stresses; apparent wall slip
Available at various institutes of the ASCR
Rotational Viscometry under Presence of Apparent Slip at Walls. VII. Torque and axial thrust in parallel-plate viscometer
An exact theory of the viscometric flow in the parallel-plate rheometer is analyzed numerically for the microdisperse liquids displaying apparent wall slip effect.
Rotational Viscometry under Presence of Apparent Slip at Walls VI. Basic Theory of ZZ, PP, KP, and KK Sensors (for VSWORK PC package under MS Windows)
Wein, Ondřej; Večeř, Marek
2003 - English
The theory of viscometric flow under apparent wall slip efefct is outlined. The working formulas for treating primary data of rotational viscometry are given.
Keywords:
slip; viscometry
Available at various institutes of the ASCR
Rotational Viscometry under Presence of Apparent Slip at Walls VI. Basic Theory of ZZ, PP, KP, and KK Sensors (for VSWORK PC package under MS Windows)
The theory of viscometric flow under apparent wall slip efefct is outlined. The working formulas for treating primary data of rotational viscometry are given.
Electrodiffusion Diagnostics of Flow. Potentiostatic Transient under AWS Conditions
Wein, Ondřej
2003 - English
The initial period of this transient does not depend on the flow conditions. It gives the estimate of the complex nFcAD
Keywords:
electrodiffusion flow diagnostic; wall slip
Available at various institutes of the ASCR
Electrodiffusion Diagnostics of Flow. Potentiostatic Transient under AWS Conditions
The initial period of this transient does not depend on the flow conditions. It gives the estimate of the complex nFcAD
Behavior of Various Separators in Spouted Bed Electrowinning of Cooper
Jiřičný, Vladimír
2002 - English
The electrowinning cell of laboratory scale has been tested with various separators. Lifetime and conditions of dendrite formation have been determined for various separators in extended experimental study where effect of operation conditions as current density, temperature, electrolyte composition and impurities have been investigated. The copper deposition was used as a model system.
Keywords:
metal electrowinning; 3D electrode; copper
Available at various institutes of the ASCR
Behavior of Various Separators in Spouted Bed Electrowinning of Cooper
The electrowinning cell of laboratory scale has been tested with various separators. Lifetime and conditions of dendrite formation have been determined for various separators in extended experimental ...
Calibration and Testing of Laboratory Electrolyser with Spouted Bed Cathode
Jiřičný, Vladimír
2002 - English
The electrowinning cell for metal deposition has been design, manufactured and tested. The laboratory size cell enable to be operated as a conventional electrolyser with slab-slab electrodes as well as un- or divided electrolyser with 3D cathode and variable thickness of cathode compartment. The calibration measurements are comparisons among various arrangements of the cell with respect to operation variables as temperature, electrolyte composition, current density, particle size and kind of separator. The copper deposition was used as a model system.
Keywords:
lab cell; slab-slab electrodes; operational variables
Available at various institutes of the ASCR
Calibration and Testing of Laboratory Electrolyser with Spouted Bed Cathode
The electrowinning cell for metal deposition has been design, manufactured and tested. The laboratory size cell enable to be operated as a conventional electrolyser with slab-slab electrodes as well ...
Stability of the Newtonian Film Flow Down an Oscillating Inclined Plane. I. Orr-Sommerfeld Problem in a Long-Wave Asymptote
Wein, Ondřej; Tihon, Jaroslav
2001 - English
Stability of the film flow an oscillating inclined plane is analyzed. Following the previous analysis by Bauer and von Kerczek (1991), the 2D linearized equations of fluctuating motion around the primary (superposed oscillatory) flow field a for a Newtonian Fluid are analyzed. The long-wave (small wave number ?)asymptotic expansion in solved up to the order O(?).
Keywords:
film flow; stability; long-wave asymptote
Available at various institutes of the ASCR
Stability of the Newtonian Film Flow Down an Oscillating Inclined Plane. I. Orr-Sommerfeld Problem in a Long-Wave Asymptote
Stability of the film flow an oscillating inclined plane is analyzed. Following the previous analysis by Bauer and von Kerczek (1991), the 2D linearized equations of fluctuating motion around the ...
Dynamics of the Wavy Film Down an Inclined Plane. V. Newtonian Orr-Sommerfeld Problem Revisited
Wein, Ondřej; Tihon, Jaroslav
2001 - English
Linear stability of the Newtonian film flow along an inclined plate is studied by treating the related 2D linearized equations of fluctuating motion (Orr-Sommerfeld). Quadratic character of the Orr-Sommerfeld (OS) equations and the corresponding multiplicity of solution (the regular and singular branch) is demonstrated. Region of validity of both the long-wave (20 terms) and short-wave (4 terms) analytic asymptotes to the regular branch is estimated by comparing it with numerical solution to the full Orr-Sommerfeld problem. In particular, the c1-stability criterion of the regular long-wave asymptote is confirmed. In addition to the basic wave characteristics of the inception region (celerity, growth rate, wavelength), the characteristics of the fluctuating wall shear rate are given.
Keywords:
liquid film flow; Non-Newtonian fluid; flow instability
Available at various institutes of the ASCR
Dynamics of the Wavy Film Down an Inclined Plane. V. Newtonian Orr-Sommerfeld Problem Revisited
Linear stability of the Newtonian film flow along an inclined plate is studied by treating the related 2D linearized equations of fluctuating motion (Orr-Sommerfeld). Quadratic character of the ...
Stability of the Newtonian Film Flow Down an Oscillating Inclined Plane. II. The Related Orr-Sommerfeld-Floquet Problems in a Long-Wave Asymptote up to 3rd Order
Wein, Ondřej; Tihon, Jaroslav
2001 - English
Linear stability of the film flow along an oscillating inclined plate is analyzed. Following the previous analyses by Yih (1968), Bajkov et al. (1982), Bauer and Kerczek (1991), Lin et al. (1996), the 2D linearized equations (Orr-Sommerfeld-Floquet) of fluctuating motion for a New-tonian fluid are treated. The long-wave (small wave number a ) asymptotic expansion for the complex-valued celerity coefficient, k = k(a) = R c(a), is solved analytically up to the or-der O(a3). In addition to well-known sufficient conditions for the wavy instability of the film under forced oscillation, the basic wave characteristics of the inception region are given: celer-ity, growth rate, and wavelength.
Keywords:
flow instability; oscillating liquid film
Available at various institutes of the ASCR
Stability of the Newtonian Film Flow Down an Oscillating Inclined Plane. II. The Related Orr-Sommerfeld-Floquet Problems in a Long-Wave Asymptote up to 3rd Order
Linear stability of the film flow along an oscillating inclined plate is analyzed. Following the previous analyses by Yih (1968), Bajkov et al. (1982), Bauer and Kerczek (1991), Lin et al. (1996), the ...
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