scholarly journals Internal flow optimization in a complex profile extrusion die using flow restrictors and flow separators

2022 ◽  
Author(s):  
Jingyang Xing ◽  
Majed Alsarheed ◽  
Animesh Kundu ◽  
John P. Coulter
Keyword(s):  
Internal Flow ◽  
Complex Profile ◽  
Flow Optimization ◽  
Extrusion Die ◽  
Profile Extrusion Die

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

Design and implementation of an integral design CAD system for plastic profile extrusion die

2016 ◽  
Vol 89 (1-4) ◽  
pp. 543-559 ◽  
Author(s):  
Li Li ◽  
Hongtao Tang ◽  
Shunsheng Guo ◽  
Lang Huang ◽  
Yaohua Xu
Keyword(s):  
Cad System ◽  
Design And Implementation ◽  
Extrusion Die ◽  
Plastic Profile ◽  
Profile Extrusion Die

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

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.

Optimization of a profile extrusion die for flow balance

2014 ◽  
Vol 15 (4) ◽  
pp. 753-761 ◽  
Author(s):  
Oktay Yilmaz ◽  
Hasan Gunes ◽  
Kadir Kirkkopru
Keyword(s):  
Flow Balance ◽  
Extrusion Die ◽  
Profile Extrusion Die

AAC Supports for Individuals With Rett Syndrome Across the Lifespan

2015 ◽  
Vol 24 (3) ◽  
pp. 74-85
Author(s):  
Sandra M. Grether
Keyword(s):  
Rett Syndrome ◽  
Communication Skills ◽  
Preliminary Analysis ◽  
Multidisciplinary Approach ◽  
Motor Deficits ◽  
Complex Profile ◽  
Communication Behaviors ◽  
The Individual

Individuals with Rett syndrome (RS) present with a complex profile. They benefit from a multidisciplinary approach for diagnosis, treatment, and follow-up. In our clinic, the Communication Matrix © (Rowland, 1990/1996/2004) is used to collect data about the communication skills and modalities used by those with RS across the lifespan. Preliminary analysis of this data supports the expected changes in communication behaviors as the individual with RS ages and motor deficits have a greater impact.

Investigation of the natural ventilation of wind catchers with different geometries in arid region houses

2020 ◽  
Vol 14 (3) ◽  
pp. 7109-7124
Author(s):  
Nasreddine Sakhri ◽  
Younes Menni ◽  
Houari Ameur ◽  
Ali J. Chamkha ◽  
Noureddine Kaid ◽  
...  
Keyword(s):  
Arid Region ◽  
Natural Ventilation ◽  
Reduction Rate ◽  
Internal Flow ◽  
Climatic Conditions ◽  
Maximum Pressure ◽  
Ventilation Technique ◽  
Window Position ◽  
The One ◽  
Flow Velocities

The wind catcher or wind tower is a natural ventilation technique that has been employed in the Middle East region and still until nowadays. The present paper aims to study the effect of the one-sided position of a wind catcher device against the ventilated space or building geometry and its natural ventilation performance. Four models based on the traditional design of a one-sided wind catcher are studied and compared. The study is achieved under the climatic conditions of the South-west of Algeria (arid region). The obtained results showed that the front and Takhtabush’s models were able to create the maximum pressure difference (ΔP) between the windward and leeward of the tower-house system. Internal airflow velocities increased with the increase of wind speed in all studied models. For example, at Vwind = 2 m/s, the internal flow velocities were 1.7, 1.8, 1.3, and 2.5 m/s for model 1, 2, 3, and 4, respectively. However, at Vwind = 6 m/s, the internal flow velocities were 5.6, 5.5, 2.5, and 7 m/s for model 1, 2, 3, and 4, respectively. The higher internal airflow velocities are given by Takhtabush, traditional, front and middle tower models, respectively, with a reduction rate between the tower outlet and occupied space by 72, 42, 36, and 33% for the middle tower, Takhtabush, traditional tower, and the front model tower, respectively. This reduction is due to the due to internal flow resistance. The third part of the study investigates the effect of window (exist opening) position on the opposite wall. The upper, middle and lower window positions are studied and compared. The air stagnation or recirculation zone inside the ventilated space reduced from 55% with the lower window to 46% for the middle window and reached 35% for the upper window position. The Front and Takhtabush models for the one-sided wind catcher with an upper window position are highly recommended for the wind-driven natural ventilation in residential houses that are located in arid regions.

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