viscoelastic fluid

Research into the time-depended transactional processes in viscoplastic fluids

Authors: Safronchik M. I., Safronchik A. I.

The paper presents problem of transition from one steady-state conditions of viscoplastic fluid flow to another between parallel planes. The problem definition is given within the limits of five- parameter model, which permits to take up differences between behavior under stress and without stress and possible slippage along the solid walls. Hysteresis of deformation is considered by means of model of smooth transition from adhesion to slippage. The solution is determined by method of momentary eigenfunctions of Melamed-Grinberg.

Creeping Flow of Viscoelastic Fluid with Free Surface at Non-Isothermal Condition

Authors: Snigerev B. A., Aliev K. M., Tazyukov F. K.

Numerical simulation flow of viscoelastic fluid with free surface, which is realized in entrance and output flow in extrusion die was performed. The flow of liquid is described by equations of conservation of mass, momentum and thermal energy with rheological constitutive equation of Giesekesus. On basis of finite element method the stable numerical scheme was developed to solve this problem. Different numerical experiments was performed to define the configuration of outflow jet in various regimes and construction of die.

The Feature of Non-Isothermal Viscoelastic Flows Around Sphere at Obstruction Condition

Authors: Snigerev B. A., Tazyukov F. K.

The numerical study is performed for study of the viscoelastic flow characteristics and heat transfer around sphere. The flow of liquid is described by equations of conservation of mass, momentum and thermal energy with rheological constitutive equation of Phan-Thien Tanner(PTT). Thismodelrepresents generalizedMaxwell typemodel with two additional parameters developed from kinetic theory of polymers. The nonlinear behaviour of fluid velocity behind body (<<negative wake>>) is observed.