Flow of thermoplastics in an annular die under orthogonal oscillations

Plane Couette flow of viscoplastic materials along a slippery vibrating wall

“…(5). When vibrations are applied, the solutions for stresses and dissipated power depend on the Oldroyd number, on the values given to W 0 and also on the magnitude of the vibrational inertia.…”

“…Among the experimental studies, Isayev et al [5] use thermoplastics in an annular die under low frequency and large deformation amplitude (0.5-2.4) orthogonal oscillations and compare the results in terms of pressure reduction and melt temperature rise with the predictions of a viscoelastic constitutive equation for three thermodynamic processes.…”

Study on the pulsating flow of a worm-like micellar solution

“…(15) and (16) the boundary conditions 1 (r * , t * ) = * 1 (r * , t * ) = 0 at r * = 0 were used. On the other hand, the average of Eq.…”

“…Likewise, pulsating and oscillating flows are important in the industrial applications such as polymer extrusion using oscillatory dies. The effect of the oscillations on the heat transfer and their interplay with inertia and viscous dissipation in nonNewtonian fluids, such as the dependency of the bulk temperature on frequency and amplitude of the oscillations, has been reported [14][15][16][17][18][19][20][21]. In addition, the use of pulsations has also been of interest in connection with heat, turbulent heat, mass transfer and coating processes [22][23][24].…”

Effect of Vibrating Extrusion on the Structure and Mechanical Properties of Isotactic Polypropylene

“…However, most of the processing operations exerted the vibration into the melt limited to the area inside the die [11,12] . The affected area of vibration is localized; thus, the vibration effect is limited.…”