Modeling of melt conveying in a deep-channel single-screw cheese stretcher

Nonisothermal two‐ and three‐dimensional flow simulations of inelastic and viscoelastic fluids by a finite‐volume method

“…The screw involves two leads. The projections of the velocity vector in the S d−channel plane, for two gap values ( = 0.05 and = 0.20), for an angular speed = 1 rad/s, for a Newtonian fluid, presented in Figure 21, point out the existence of two flow zones, one in the (positive) flow direction near the barrel, the other one in the opposite direction at the bottom of the channel, similarly to Broszeit results [30]. The size of the reverse flow zone has been found to decrease when the gap is reduced.…”

“…The results also underline the role of rheological parameters in the computed kinematics, temperature and stresses. The numerical simulations with the screwbarrel system supply data that have been obtained up to now, to our knowledge, from twodimensional analyses based upon geometrical approximations [29][30][31]. The outcome allows to state on flow characteristics in such complicated three-dimensional configurations, in relation to geometrical features and properties of the fluids.…”

Modeling of melt conveying and heat transfer in a twin-screw cheese stretcher

“…2), the whole zone is simplified into a rectangular tube. A 2-D finite element mesh was applied to solve for velocity and temperature unknowns at any downchannel position, which is a cross-section of the tube (Yu & Gunasekaran, 2003). Along the down-channel direction a finite difference mesh is used to advance from the entrance to the end.…”

“…The details of the procedure used to solve for flow and temperature fields in the transitional zone was reported in our previous publication (Yu & Gunasekaran, 2003).…”

A finite-difference method for the prediction of velocity field in extrusion process

“…Using the resulting experimental data, Li and Hsieh (1996), developed and tested an analytical solution of an isothermal, Newtonian fluid in a single screw extruder with finite channel. Following this analytical approach, Yu and Gunasekaran (2003), proposed and tested a numerical approach to analyze flow field and heat transfer developed inside a single-screw channel. Finite-difference and finite element methods were used to obtain numerical solutions for flow and energy equations also in the case of non-Newtonian fluids.…”