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Propagation of acceleration waves in the viscoelastic Johnson-Segalman fluids

Gültop T. | Alyavuz B. | Kopaç M.

Article | 2010 | Mechanics Research Communications37 ( 2 ) , pp.153 - 157

The propagation conditions of acceleration waves are investigated for a viscoelastic fluid using the Johnson-Segalman viscoelastic model. Explicit expressions are obtained for the wave speeds adopting the theory of singular surfaces. The simple shearing motion, uniaxial, biaxial extension and uniform dilation are considered as the initial states of deformation. The variations of the speeds with the propagation direction, stretch ratio and material parameters are presented. © 2009 Elsevier Ltd. All rights reserved.

Comparative evaluation of some existing rate-type constitutive equations for a viscoelastic fluid undergoing wiggle flow

Kopaç M. | Hortaçsu A. | Arikol M.

Article | 1997 | Journal of Non-Newtonian Fluid Mechanics68 ( 1 ) , pp.1 - 15

A comparative evaluation of existing rate-type constitutive equations is provided for a viscoelastic fluid undergoing accelerated flow. To this end, accurate point velocity and stress birefringence data previously obtained by laser Doppler anemometry and stress birefringence are utilized. For each constitutive equation, the numerical values of constants which yield the best fit with experimental data are determined via non-linear regression analysis. The best agreement between experimental and calculated normal stress differences is obtained with the White-Metzner equation. The success of this equation is attributed to the deformati . . .on rate dependence of its viscosity and time constant. © 1997 Elsevier Science B.V. All rights reserved Daha fazlası Daha az

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