Modeling of the three-dimensional flow of polymer melt in a convergent channel of rectangular cross-section

2015 ◽  
Vol 50 (3) ◽  
pp. 315-321 ◽  
Author(s):  
K. B. Koshelev ◽  
G. V. Pyshnograi ◽  
M. Yu. Tolstykh
Keyword(s):  
Cross Section ◽  
Rectangular Cross Section ◽  
Three Dimensional ◽  
Polymer Melt ◽  
Three Dimensional Flow ◽  
Convergent Channel ◽  
Dimensional Flow

Measurement and analysis of three-dimensional flow in a centrifugal fan volute with large volute width and rectangular cross-section

2006 ◽  
Vol 220 (2) ◽  
pp. 133-153 ◽  
Author(s):  
D Qi ◽  
Y Zhang ◽  
S Wen ◽  
Q Liu
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Design Method ◽  
Rectangular Cross Section ◽  
Three Dimensional ◽  
Centrifugal Fan ◽  
Three Dimensional Flow ◽  
Dimensional Flow ◽  
Flow Parameters ◽  
Flow Phenomena

Among all the elements of a centrifugal fan, the volute is the one that has the lowest flow efficiency. Therefore, improving the performance of the volute is an efficient way to improve the total performance of a centrifugal fan. To contribute a better understanding of the flow structure in the fan volute, the three-dimensional flow in a centrifugal fan volute with a large volute width and rectangular cross-section has been measured in detail by means of five-hole probe at three different flowrates. The time-average swirling and throughflow velocity, static and total pressure distributions on eight cross-sections in the throughflow direction of the volute are presented. The results show the formation and development of the flow in the fan volute of this type, indicate the variation of flow parameters, and discover some peculiar flow phenomena different from the traditional understanding. On the basis of the experimental results, the main hydraulic losses in this kind of fan volute have been preliminarily classified and analysed. The results show that the traditional one-dimensional design method of the volute should be further improved as it is only based on the law of momentum moment conservation and the ideal assumption that the distribution of flow parameters are uniform at the volute inlet.

Steady flow past non-uniform wire grids

1964 ◽  
Vol 19 (4) ◽  
pp. 491-512 ◽  
Author(s):  
J. H. McCarthy
Keyword(s):  
Cross Section ◽  
Equations Of Motion ◽  
Three Dimensional ◽  
Circular Cross Section ◽  
Water Tunnel ◽  
Three Dimensional Flow ◽  
Sheared Flow ◽  
Dimensional Flow ◽  
Flow Past ◽  
Two Dimensional Flow

A solution is obtained for steady, moderately sheared, three-dimensional flow past a wire grid of arbitrary resistance distribution which is placed normal to the axis of a duct of arbitrary but constant cross-section. The formulation presented is an extension of those given by Owen & Zienkiewicz (1957) and Elder (1959) for weakly shared, two-dimensional flow past wire grids. Unlike these earlier formulations, however, in the present study the equations of motion are solved without placing restrictions on the magnitude of variation of resistance across the grid. The resulting solution, taking account of streamline deflexions, is verified experimentally for moderately sheared flow past three grids constructed to produce three widely differing velocity distributions in a water tunnel of circular cross-section.

scholarly journals Processing of two-dimensional velocity fields for reconstructing three-dimensional flow patterns

2021 ◽  
Vol 2127 (1) ◽  
pp. 012031
Author(s):  
S Yu Belov
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Three Dimensional ◽  
Velocity Fields ◽  
Optical Methods ◽  
Two Dimensional ◽  
Three Dimensional Flow ◽  
Dimensional Flow ◽  
Optimal Type

Abstract The paper is concerned with the obtaining three-dimensional velocity fields of a gas or liquid flow based on the available cross-sections of this flow. The descriptions of the main optical methods for studying flows are designed to construct a cross-section of the observed process, but it would be much more informative to obtain information in the visualization not in the cross-section of a volume, but in this volume itself. The paper deals with obtaining three-dimensional flow velocity fields using various approximation methods. The method of estimating the most suitable approximating function is also given. The determination of the optimal type of approximation for the reconstruction of the three-dimensional velocity field was tested on an artificially created vortex.

scholarly journals Пространственные эффекты при взаимодействии ударной волны с продольным каналом газа пониженной плотности

2018 ◽  
Vol 44 (20) ◽  
pp. 5
Author(s):  
П.Ю. Георгиевский ◽  
В.А. Левин ◽  
О.Г. Сутырин
Keyword(s):  
Cross Section ◽  
Rectangular Cross Section ◽  
Rectangular Channel ◽  
Three Dimensional ◽  
Low Density ◽  
Three Dimensional Flow ◽  
Gas Channel ◽  
Cross Section Shape ◽  
Dimensional Interaction ◽  
Section Shape

AbstractThree-dimensional interaction of a shock with lateral low-density gas channel of round, elliptic or rectangular cross-section is numerically studied using Euler’s equations. The structure of formed shock wave precursor is described in detail. Internal shear layer instabilities in three-dimensional flow are shown to develop faster than in axisymmetric case. Moderate amplification of high-pressure jet cumulation effect is noted for elliptic and rectangular channel cases. Dependence of precursor growth rate on cross-section shape is studied. It is found that stretching of cross-section shape significantly increases the duration of linear precursor growth phase.

The Computation of Secondary Flow in a 90° Rectangular Cross-Section Bend

1989 ◽  
Vol 203 (6) ◽  
pp. 403-409
Author(s):  
M W Johnson
Keyword(s):  
Cross Section ◽  
Energy Equation ◽  
Rectangular Cross Section ◽  
Three Dimensional ◽  
Secondary Flows ◽  
Three Dimensional Flow ◽  
Time Marching ◽  
Model Equations ◽  
Marching Scheme ◽  
Good Agreement

An explicit time-marching scheme for incompressible inviscid three-dimensional flow is presented. The procedure uses an alternative method to the pseudo compressibility technique and uses the energy equation in place of the continuity equation. Calculations are performed for predicting the strong secondary flows produced when a shear flow enters a 90° bend with a rectangular cross-section. Good agreement is achieved with experimental results and rotation of the Bernoulli surfaces through almost 180° is obtained. Discrepancies in the predictions are largely due to the absence of the viscous terms in the computational model equations.

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