Design, optimization, and manufacturing of a multiple-thickness profile extrusion die with a cross flow

2010 ◽  
Vol 50 (12) ◽  
pp. 2417-2424 ◽  
Author(s):  
A. Rezaei Shahreza ◽  
A.H. Behravesh ◽  
M. Bakhshi Jooybari ◽  
E. Soury
Keyword(s):  
Design Optimization ◽  
Cross Flow ◽  
Thickness Profile ◽  
Extrusion Die ◽  
Profile Extrusion Die

Design optimization of a cross-flow He-Xe recuperator through second law analysis

2020 ◽  
Vol 19 ◽  
pp. 100568
Author(s):  
Élvis F. de Araújo ◽  
Guilherme B. Ribeiro ◽  
Lamartine N.F. Guimarães
Keyword(s):  
Design Optimization ◽  
Cross Flow ◽  
Second Law ◽  
Second Law Analysis

scholarly journals Optimized Design Method for Profile Extrusion Die Based on NURBS Modeling

2019 ◽  
Vol 20 (8) ◽  
pp. 1733-1741 ◽  
Author(s):  
Guangdong Zhang ◽  
Xiang Huang ◽  
Shuanggao Li ◽  
Tong Deng
Keyword(s):  
Design Method ◽  
Optimized Design ◽  
Extrusion Die ◽  
Profile Extrusion Die

Computer-aided design and optimization of profile extrusion dies for thermoplastics and rubber: a review

2011 ◽  
Vol 225 (4) ◽  
pp. 280-321 ◽  
Author(s):  
J F T Pittman
Keyword(s):  
Design Optimization ◽  
Computer Aided Design ◽  
Cross Flow ◽  
Wall Slip ◽  
Economic Benefits ◽  
Die Design ◽  
Computer Assisted ◽  
Extrudate Swell ◽  
Design And Optimization ◽  
Extrusion Dies

A review is provided of issues and techniques in design and optimization of profile extrusion dies for thermoplastics and rubber, with particular emphasis on unplasticized polyvinyl chloride and rubber compounds. Traditional profile die design methods are contrasted with computer-based ones, with respect to efficiency and economic benefits. The main types of die construction are outlined. Physical phenomena relevant to the design and performance of dies are summarized, including: rheology and kinematics of the flow, wall slip, extrusion instabilities, residence time and degradation, extrudate swell, draw-down, and thermal effects. Approaches and strategies for die design are explained, including: flow balancing – with guidance from analytic flow results, the Avoid-Cross-Flow strategy, use of flow separators, and designing for extrudate swell. Published computer simulations of die flow used to assist with design are reviewed. Introducing automatic die design, the structure and elements of a computerized design optimization environment are set out. Key components and options within this are described, including: objective functions, constraints, design variables, optimization algorithms, design parameterization and flow domain meshing, and optimization strategies. Published implementations of computerized profile die design optimization are described. Automatic design optimization is compared with the work of a designer assisted by flow simulations in the industrial environment, showing how substantial reductions in demands on the designer's time are possible. The nature and potential of robust design is outlined, with techniques for its implementation. Conclusions are drawn as to the present state of the art in computer-assisted profile die design and optimization, and potential advances.

Design optimization of a novel vertical augmentation channel housing a cross-flow turbine and performance evaluation as a wave energy converter

2021 ◽  
Vol 180 ◽  
pp. 1300-1314
Author(s):  
A.H. Samitha Weerakoon ◽  
Byung-Ha Kim ◽  
Young-Jin Cho ◽  
Deepak Divashkar Prasad ◽  
M. Rafiuddin Ahmed ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Design Optimization ◽  
Wave Energy ◽  
Cross Flow ◽  
Wave Energy Converter ◽  
Energy Converter ◽  
And Performance

Numerical Investigation of Viscoelastic Flow and Swell Behaviors of Polymer Melts in the Hollow Profile Extrusion Process

2010 ◽  
Vol 97-101 ◽  
pp. 209-213 ◽  
Author(s):  
Yue Mu ◽  
Guo Qun Zhao ◽  
Cheng Rui Zhang
Keyword(s):  
Polymer Melts ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Extrusion Process ◽  
Viscoelastic Flow ◽  
Extrusion Die ◽  
Element Simulation ◽  
The Mathematical Model ◽  
Profile Extrusion Die ◽  
Streamline Method

The viscoelastic flow and swell behaviors of polymer melts in the profile extrusion process can significantly influence the performance and dimension of the final products. In the study, the viscoelastic flow pattern of a commercial low density polyethylene (LDPE) extruded through out of the hollow profiled extrusion die is investigated by means of finite element simulation. The mathematical model of three-dimensional viscoelastic flow and swell of polymer melts is established with a differential Phan-Thien and Tanner (PTT) constitutive model. A penalty method is employed to solve the non-linear problem with a decoupled algorithm. The computation stability is improved by using the discrete elastic-viscous split stress (DEVSS) algorithm with the inconsistent streamline-upwind (SU) scheme. A streamface-streamline method is introduced to adjust the swelling free surface of the extrudate. The essential viscoelastic flow characteristics of LDPE flowing through out of the hollow profile extrusion die is investigated based on the proposed numerical scheme. Both the redistribution of flow velocity and the release of stress are found to be the reasons for the swell phenomenon.

A Novel Multi-Stage Impingement Cooling Scheme—Part II: Design Optimization

2020 ◽  
Vol 142 (12) ◽  
Author(s):  
Kexin Liu ◽  
Qiang Zhang
Keyword(s):  
Design Optimization ◽  
Gas Turbine ◽  
Cross Flow ◽  
Target Surface ◽  
Optimization Strategy ◽  
Working Mechanism ◽  
Impingement Cooling ◽  
Multi Stage ◽  
Cooling Air ◽  
Combustor Liner

Abstract Cross flow and coolant maldistribution are the common design challenges for impingement cooling in modern gas turbine. This paper reports a novel multi-stage impingement cooling scheme for combustor liner. The design concept and general working mechanism are introduced in the Part I paper. This Part II paper presents the design flexibilities and optimization strategies. Conjugate heat transfer (CHT) analysis was conducted at a range of Reynolds numbers to assess the thermal performance, loss penalty, and the working mechanism behind. The results show that varying the jet hole diameter in each cooling stage can be an effective design optimization strategy in balancing the cooling requirement and loss penalty. Inter-stage bypass design is also another design flexibility offered by the multi-stage scheme to regulate the cooling air consumption at different stages. With these optimization strategies, the target surface temperature and local gradient can be effectively reduced with reasonable pressure loss with 50% reduction in the cooling air consumption compared to conventional single-stage impingement design. This multi-stage impingement concept can be practically applied to gas turbine combustor liner and turbine blade cooling.

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