Three-dimensional viscoelastic simulation of coextrusion process: comparison with experimental data

2002 ◽  
Vol 41 (1-2) ◽  
pp. 144-153 ◽  
Author(s):  
Ki Byung Sunwoo ◽  
Seung Joon Park ◽  
Seong Jae Lee ◽  
Kyung Hyun Ahn ◽  
Seung Jong Lee
Keyword(s):  
Experimental Data ◽  
Three Dimensional ◽  
Process Comparison ◽  
Comparison With Experimental Data

Theoretical Evaluation of the Effects of the Impeller Entrance Geometry and of the Incident Angle on Cavitation Inception in Centrifugal Pumps

1995 ◽  
Vol 209 (1) ◽  
pp. 29-38 ◽  
Author(s):  
G Ardizzon ◽  
G Pavesi
Keyword(s):  
Experimental Data ◽  
Pressure Drop ◽  
Present Model ◽  
Incident Angle ◽  
Three Dimensional ◽  
Centrifugal Pumps ◽  
Theoretical Evaluation ◽  
Cavitation Inception ◽  
Cavitation Performance ◽  
Comparison With Experimental Data

A method, based on quasi three-dimensional analysis, of describing pump cavitation behaviour is proposed. Cavitation performance is related to impeller entrance design and the influence of the angle of attack of the leading edges on the flow is studied. Coefficients are derived from the pressure drop due separately to the vanes and shroud. The influence of incident angle on cavitation is shown as a function of the blade geometry and discussed. By comparison with experimental data on centrifugal pumps, it is shown that the present model can simulate the characteristics of inception cavitation at design and off-design conditions.

Close-packed anisotropic antiferromagnetic Ising lattices. I

1969 ◽  
Vol 47 (23) ◽  
pp. 2621-2631 ◽  
Author(s):  
John Stephenson
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Ising Model ◽  
Lattice Structure ◽  
Integral Formula ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Ising Lattice ◽  
Ising Lattices ◽  
Comparison With Experimental Data

A detailed account of the nonmagnetic thermodynamic properties of the two-dimensional, anisotropic, antiferromagnetic, triangular Ising lattice, in the absence of a magnetic field, is presented. The notion of a disorder temperature, TD, is introduced via the exact integral formula for the logarithm of the partition function per spin, and the energy and entropy per spin are evaluated explicitly at TD. Study of the theoretical specific heat curves, and of graphs of the percentage of energy and entropy below the Néel point, shows that the close-packed antiferromagnetic triangular lattice has a qualitatively different behavior from two-dimensional loose-packed lattices. It is suggested that a similar situation will occur in three-dimensional close-packed lattices, and therefore that it is important to use a close-packed Ising model for comparison with experimental data on antiferromagnets which have close-packed lattice structure, or loose-packed lattice structure with higher neighbor interactions.

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