The flow velocity distribution from the doppler information on a plane in three-dimensional flow

2006 ◽  
Vol 9 (1) ◽  
pp. 69-82 ◽  
Author(s):  
S. Ohtsuki ◽  
M. Tanaka
Keyword(s):  
Velocity Distribution ◽  
Flow Velocity ◽  
Three Dimensional ◽  
Three Dimensional Flow ◽  
Dimensional Flow

Finite Element and Experimental Analysis of Three-Dimensional Flow State of Plastic Melt in Slit Die Section

2008 ◽  
Vol 575-578 ◽  
pp. 427-431 ◽  
Author(s):  
Sheng Xue Qin ◽  
Guo Qun Zhao ◽  
Yue Mu ◽  
Xing Ming Xu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Velocity Distribution ◽  
Three Dimensional ◽  
Element Model ◽  
Extrusion Process ◽  
Polymer Extrusion ◽  
Three Dimensional Flow ◽  
Dimensional Flow ◽  
Slit Die

In this paper, penalty finite element method is applied to the simulation of three-dimensional incompressible viscous steady flow, and the program is coded for analysis of three-dimensional flow process of plastic melt in extrusion die. Slit die is typical in polymer extrusion process, and the relevant part is used widely. Because the flow law is different for various polymers with different rheological character even in the same die, the polymer flow in slit die is simulated for Newtonian fluid and power-law fluid by the program and ANSYS, respectively. Flow laws of two kinds of fluid are compared, and the result shows that the non-uniform velocity distribution in outlet is caused by the non-Newtonian effect of material. The penalty factor is important for the penalty finite element model, which decides the precision and efficiency to a great extent. The proper penalty value is decided by some factors, for example, the character of the whole equations and geometric model. Numerical solution with change of penalty value and viscosity is analyzed, and the result shows that the penalty value should be suited with viscosity in special range for penalty finite element model. The experiment has been developed, and the velocity distribution in outlet of slit die is measured. The result of finite element analysis is consistent with experimental result basically, and the reason of result divergence of the two ways is analyzed. The results show that the given model is suited for the polymer extrusion process, and the advice of the selection of penalty value is instructional for penalty element model.

Three-Dimensional Flow Field Measurements in a Radial Inflow Turbine Scroll Using LDV

1987 ◽  
Vol 109 (2) ◽  
pp. 163-169 ◽  
Author(s):  
M. F. Malak ◽  
A. Hamed ◽  
W. Tabakoff
Keyword(s):  
Experimental Study ◽  
Flow Field ◽  
Flow Velocity ◽  
Three Dimensional ◽  
Field Measurements ◽  
Three Dimensional Flow ◽  
Cold Flow ◽  
Dimensional Flow ◽  
Through Flow ◽  
Radial Inflow Turbine

The results of an experimental study of the three-dimensional flow field in a radial inflow turbine scroll are presented. A two-color LDV system was used in the measurement of three orthogonal velocity components at 758 points located throughout the scroll and the unvaned portion of the nozzle. The cold flow experimental results are presented for through-flow velocity contours and the cross velocity vectors.

scholarly journals Three-Dimensional Flow Measurements in a Turbine Scroll

1984 ◽  
Vol 106 (2) ◽  
pp. 516-522 ◽  
Author(s):  
W. Tabakoff ◽  
B. V. R. Vittal ◽  
B. Wood
Keyword(s):  
Flow Velocity ◽  
Secondary Flow ◽  
Flow Behavior ◽  
Three Dimensional ◽  
Three Dimensional Flow ◽  
Flow Measurements ◽  
Dimensional Flow ◽  
Through Flow ◽  
Hot Film ◽  
Hot Film Anemometry

A study was conducted to determine experimentally the flow behavior in combined scroll nozzle assembly of a radial inflow turbine. Hot film anemometry technique was used to measure the three-dimensional flow velocity in the scroll. The through-flow and secondary flow velocity components are measured at various points in three scroll sections.

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