Numerical study of the extrusion process in cereals production: Part II. Analysis of variance

Ficarella, Antonio; Milanese, Marco; Laforgia, Domenico

doi:10.1016/j.jfoodeng.2004.11.035

Cited by 15 publications

(8 citation statements)

References 23 publications

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“…For first principles simulations of the flow in co-rotating twinscrew extruders, mainly mesh-based CFD (computational fluid dynamics) methods, such as the FEM (finite element method) and FVM (finite volume method), have been used (e.g., Ishikawa, 2001;Bertrand et al, 2003;Malik and Kalyon, 2005;Ficarella et al, 2006a;Ficarella et al, 2006b;Kalyon and Malik, 2007;Barrera et al, 2008;Bierdel, 2008;Conzen, 2008;Rodríguez, 2009;Haghayeghi et al, 2010;Vyakaranam et al, 2012;Sarhangi Fard et al, 2012a;Sarhangi Fard et al, 2012b;Sarhangi Fard and Anderson, 2013;Hétu and Ilinca, 2013;Rathod and Kokini, 2013;Sobhani et al, 2013;Durin et al, 2014). FEM was also used to simulate complex fluids in extruders including wall slip phenomena, (e.g., Kalyon et al, 1999;Lawal et al, 1999;Malik et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Co-rotating twin-screw extruders: Detailed analysis of conveying elements based on smoothed particle hydrodynamics. Part 1: Hydrodynamics

Eitzlmayr

Khinast

2015

Chemical Engineering Science

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We applied SPH to study the flow in a co-rotating twin-screw extruder. A new model which accounts for the flow in unresolved clearances was presented. We showed detailed results for pressure drop, flow rate and power consumption. We achieved excellent agreement with CFD data for the completely filled state. Detailed results for the partially filled state are included. a b s t r a c tDue to the complex geometry of the rotating screws and, typically, free surface flows in partially filled screw sections, first principles simulations of the flow in co-rotating intermeshing twin-screw extruders using the well-established, mesh-based CFD (computational fluid dynamics) approaches are highly challenging. These issues can be resolved via the smoothed particle hydrodynamics (SPH) method thanks to its meshless nature and the inherent capability to simulate free surface flows. In our previous work, we developed a novel method for modeling the boundary conditions with complex wall geometries, under which SPH could be efficiently applied to complex surfaces of typical screw geometries of extruders. In this work, we employed SPH and our boundary method to study the flow in a conveying element in detail. To address unresolved clearances, we developed a new model that is coupled to SPH and can correctly account for the flow through unresolved clearances. A validation of our approach using CFD data from the literature for a completely filled conveying element indicated excellent agreement. Consequently, we studied the flow in a partially filled conveying element and obtained results for the flow rate, the power input and the axial force with variable filling ratio. A detailed analysis of the corresponding mixing phenomena is presented in Part 2. Our results show that the proposed method is a comprehensive approach to study the flow in different types of screw elements in detail, providing an excellent basis for further development of simplified models of entire extrusion processes.

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Section: Introductionmentioning

confidence: 99%

Co-rotating twin-screw extruders: Detailed analysis of conveying elements based on smoothed particle hydrodynamics. Part 1: Hydrodynamics

Eitzlmayr

Khinast

2015

Chemical Engineering Science

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“…Mixing in screw extruders can be distinguished by distributive mixing and dispersive mixing. Mixing index λ [16] and area stretch ς [14] are defined to estimate dispersive mixing.…”

Section: Mixing Modelmentioning

confidence: 99%

Numerical Simulation of Effect of Slip Conditions on PVC Co-Rotating Twin-Screw Extrusion

Cao

Chen

2011

AMR

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The effect of wall conditions on the co-rotating parallel twin-screw extrusion of rigid polyvinyl chloride (RPVC) is studied. The relationship between the shear stress at the screw wall and the slip velocity of the flowing melt obeys Navier’s linear law. At zero pressure difference between the entrance and exit of the melting section of twin-screw extruder, the volumetric flow rate and 3D isothermal flow fields of RPVC are calculated under different wall slip conditions in the metering section of the twin-screw extruder by using the evolution technique in POLYFLOW. The results show that when the slip coefficient is smaller than 104Pa*s/m , the volumetric flow rate of the melt is constant, corresponding to the full slip condition. When the slip coefficient is larger than 104Pa*s/m , with the slip coefficient decreasing, the volumetric flow rate and viscosity increase, but the gradients of velocity, pressure, and shear rate decrease. The residual stress of the product is thus reduced. Therefore, increasing wall slip is good for the stability of polymer extrusion and the product quality. The dispersive and the distributive mixing of the twin-screw extruder under full slip and no slip conditions are also studied. Results show that the mixing performance under no-slip condition is better than under full-slip condition, but slip at the wall is good for the extrusion of heat-sensitive materials.

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“…Extrusion technology has become famous technique for preparing ready to eat extruded snacks due to its low cost, versatility and no process effluents (Ficarella et al, 2006;White, 1994). There are number of extruded snacks are available in market.…”

Section: Introductionmentioning

confidence: 99%

A Study on Techno - Economic Feasibility for Production of Iron Enriched Extruded Snacks

Bhople¹,

Singh²

2018

Int.J.Curr.Microbiol.App.Sci

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Numerical study of the extrusion process in cereals production: Part II. Analysis of variance

Cited by 15 publications

References 23 publications

Co-rotating twin-screw extruders: Detailed analysis of conveying elements based on smoothed particle hydrodynamics. Part 1: Hydrodynamics

Co-rotating twin-screw extruders: Detailed analysis of conveying elements based on smoothed particle hydrodynamics. Part 1: Hydrodynamics

Numerical Simulation of Effect of Slip Conditions on PVC Co-Rotating Twin-Screw Extrusion

A Study on Techno - Economic Feasibility for Production of Iron Enriched Extruded Snacks

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