Axial pressure profiles in non-newtonian flow: Part II: Viscometric flow and relaxation phenomena analyses

1972 ◽  
Vol 50 (5) ◽  
pp. 587-590 ◽  
Author(s):  
David B. Blum ◽  
Joseph Yerushalmi ◽  
David J. Williams
Keyword(s):  
Relaxation Phenomena ◽  
Axial Pressure ◽  
Newtonian Flow ◽  
Viscometric Flow ◽  
Pressure Profiles ◽  
Flow Part

scholarly journals Flow Visualization in a Simulated Brush Seal

1990 ◽  
Author(s):  
M. J. Braun ◽  
R. C. Hendricks ◽  
V. Canacci
Keyword(s):  
Flow Visualization ◽  
Flow Fields ◽  
Inlet Pressure ◽  
Complex Flow ◽  
Axial Pressure ◽  
Interface Motion ◽  
Pressure Profiles ◽  
Brush Seal ◽  
Brush Seals

A method to visualize and characterize the complex flow fields in simulated brush seals is presented. The brush seal configuration was tested in a water and then in an oil tunnel. The visualization procedure revealed typical regions that are rivering, jetting, vortical or lateral flows and exist upstream, downstream or within the seal. Such flows are engendered by variations in fiber void that are spatial and temporal and affect changes in seal leakage and stability. While the effects of interface motion for linear or cylindrical configurations have not been considered herein, it is believed that the observed flow fields characterize flow phenomenology in both circular and linear brush seals. The axial pressure profiles upstream, across and downstream of the brush in the oil tunnel have been measured under a variety of inlet pressure conditions and the ensuing pressure maps are presented and discussed.

scholarly journals Bidirectional Brush Seals – Post-Test Analysis

1999 ◽  
Vol 5 (3) ◽  
pp. 167-180 ◽  
Author(s):  
Robert C. Hendricks ◽  
Jack Wilson ◽  
Tom Y. Wu ◽  
Ralph Flower ◽  
Robert L. Mullen
Keyword(s):  
Pressure Gradients ◽  
Wave Rotor ◽  
Axial Pressure ◽  
Test Analysis ◽  
Pressure Drops ◽  
Pressure Profiles ◽  
Response Range ◽  
Post Test ◽  
Brush Seals ◽  
Outside Diameter

A post-test analysis of a set of inside-diameter/outside-diameter (ID/OD) bidirectional brush seals used in three-port wave rotor tests was undertaken to determine brush bristle and configuration wear, pullout, and rotor coating wear. The results suggest that sharp changes in the pressure profiles were not well reflected in bristle tip configuration patterns or wear. Also, positive-to-negative changes in axial pressure gradients appeared to have little effect on the backing plates. Although the brushes had similar porosities, they had very different unpacked arrays. This difference could explain the departure of experimental data from computational fluid dynamics flow predictions for well-packed arrays at higher pressure drops. The rotor wear led to “car track” scars (upper and lower wear bands) with a whipped surface between the bands. Those bands may have resulted from bristle stiffening at the fence and gap plates during alternate portions of the rotor cycle. Within the bristle response range the wear surface reflected the pressure distribution effect on bristle motion. No sacrificial metallurgical data were taken. The bristles did wear, with correspondingly more wear on the ID brush configurations than on the OD configurations; the complexity in constructing the ID brush was a factor.

Developing pressure profiles for non-Newtonian flow in an annular duct

AIChE Journal ◽  
1974 ◽  
Vol 20 (1) ◽  
pp. 154-158 ◽  
Author(s):  
Satinath Bhattacharyya ◽  
Carlos Tiu
Keyword(s):  
Newtonian Flow ◽  
Annular Duct ◽  
Pressure Profiles

Measurement of axial pressure profiles in large-size industrial flotation columns

1995 ◽  
Vol 8 (1-2) ◽  
pp. 101-109 ◽  
Author(s):  
J.B. Yianatos ◽  
L.G. Bergh ◽  
C. Sepulveda ◽  
R. Nunez
Keyword(s):  
Axial Pressure ◽  
Large Size ◽  
Pressure Profiles ◽  
Flotation Columns

scholarly journals IFAR liner benchmark challenge #1 – DLR impedance eduction of uniform and axially segmented liners and comparison with NASA results

2021 ◽  
pp. 1475472X2110238
Author(s):  
Friedrich Bake ◽  
Ralf Burgmayer ◽  
Anita Schulz ◽  
Karsten Knobloch ◽  
Lars Enghardt ◽  
...  
Keyword(s):  
Test Facility ◽  
Axial Pressure ◽  
Design Data ◽  
One Dimensional ◽  
Pressure Profiles ◽  
Straightforward Method ◽  
Flow Test ◽  
The One ◽  
German Aerospace ◽  
Good Agreement

This paper presents the contribution from the German Aerospace Center (DLR) to the first liner benchmark challenge under the framework of the International Forum for Aviation Research (IFAR). Therefore, two sets of acoustically damping wall treatments, called ‘liner samples’, have been produced by additive manufacturing based on the design data provided by NASA coordinating this benchmark. These liner samples have been integrated and acoustically characterized in the liner flow test facility DUCT-R at DLR Berlin as well as in the liner flow test facility GFIT at NASA Langley. Besides the dissipation coefficients and the axial pressure profiles, the liner wall impedance was educed by first determining the axial wave numbers and then applying a straightforward method based on the one-dimensional Convected Helmholtz Equation. Finally, the comparison of the liner impedance values to the NASA results show a fairly good agreement.

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