scholarly journals Plane-wave tube validation of bandwidth extension for energy-based quantities using pressure gradient methods

2017 ◽  
Author(s):  
Daxton Hawks ◽  
Tracianne B. Neilsen ◽  
Kent L. Gee ◽  
Scott D. Sommerfeldt
Keyword(s):  
Plane Wave ◽  
Pressure Gradient ◽  
Gradient Methods ◽  
Wave Tube ◽  
Bandwidth Extension

Comparative sensitivity of pressure gradient receivers of force and inertial types to sound pressure in plane wave

2015 ◽  
Author(s):  
Vladimir I. Korenbaum ◽  
Sergei V. Gorovoy ◽  
Alexandr A. Tagiltcev ◽  
Anatoly E. Kostiv
Keyword(s):  
Plane Wave ◽  
Pressure Gradient ◽  
Sound Pressure ◽  
Comparative Sensitivity ◽  
Inertial Types

Calculation of boundary-layer development using the turbulent energy equation: compressible flow on adiabatic walls

1971 ◽  
Vol 46 (1) ◽  
pp. 83-110 ◽  
Author(s):  
P. Bradshaw ◽  
D. H. Ferriss
Keyword(s):  
Pressure Gradient ◽  
Compressible Flow ◽  
Incompressible Flow ◽  
Gradient Methods ◽  
Turbulent Energy ◽  
Turbulence Structure ◽  
Flow Surface ◽  
Boundary Layer Development ◽  
Dimensional Boundary ◽  
Layer Development

The basic method described by Bradshaw, Ferriss & Atwell (1967) is extended to compressible flow in two-dimensional boundary layers in arbitrary pressure gradient (excluding shock waves and expansion fans) by invoking Morkovin's hypothesis (Favre 1964) that the turbulence structure is unaffected by compressibility. Using the same empirical functions as in incompressible flow, skin friction in zero pressure gradient is predicted to within 3% of Spalding & Chi's (1964) correlation for free-stream Mach numbers less than 5. Comparisons with experiments in pressure gradient are restricted by the lack of data, but, since Morkovin's hypothesis does not depend on pressure gradient, methods which use it (of which the present method seems to be the first) can be checked fairly adequately by comparisons with data in zero pressure gradient.No ‘compressibility transformations’ are needed, although the Crocco relation is used, provisionally, for the temperature: since the calculations take only about 20% longer than in incompressible flow, Morkovin's hypothesis does as much as any transformation could do. It is pointed out that, in supersonic flow, surface curvature which is large enough to induce a significant longitudinal pressure gradient is also large enough to have a very significant effect on the turbulence structure.

Pressure Drop During Condensation in Microchannels

2013 ◽  
Vol 135 (9) ◽  
Author(s):  
Hua Sheng Wang ◽  
Jie Sun ◽  
John W. Rose
Keyword(s):  
Experimental Data ◽  
Pressure Gradient ◽  
Void Fraction ◽  
Annular Flow ◽  
Gradient Methods ◽  
Pressure Gradients ◽  
High Quality ◽  
Friction Pressure ◽  
Flow Condensation ◽  
Approximate Equations

The paper reports calculations of friction pressure gradient for the special case of laminar annular flow condensation in microchannels. This is the only flow regime permitting theoretical solution without having recourse to experimental data. Comparisons are made with correlations based on experimental data for R134a. The correlations differ somewhat among themselves with the ratio of highest to lowest predicted friction pressure gradient typically around 1.4 and nearer to unity at high quality. The friction pressure gradients given by the laminar annular flow solutions are in fair agreement with the correlations at high quality and lower than the correlations at lower quality. Attention is drawn to the fact that the friction pressure gradient cannot be directly observed and its evaluation from measurements requires estimation of the nondissipative momentum or acceleration pressure gradient. Methods used to estimate the nondissipative pressure gradient require quality and void fraction together with equations which relate these and whose accuracy is difficult to quantify. Quality and void fraction can be readily found from the laminar annular flow solutions. Significant differences are found between these and values from approximate equations.

Comparative sensitivity of pressure gradient receivers of force and inertial types to sound pressure in plane wave

2015 ◽  
Vol 137 (4) ◽  
pp. 2242-2242
Author(s):  
Vladimir Korenbaum ◽  
Sergei Gorovoy ◽  
Alexandr Tagiltcev ◽  
Anatoly Kostiv
Keyword(s):  
Plane Wave ◽  
Pressure Gradient ◽  
Sound Pressure ◽  
Comparative Sensitivity ◽  
Inertial Types

Microphone and microphone array characterization utilizing the plane wave tube method

2017 ◽  
Vol 141 (5) ◽  
pp. 3677-3677 ◽  
Author(s):  
Tung Shen Chew ◽  
Arthur Zhao ◽  
Robert Littrell
Keyword(s):  
Plane Wave ◽  
Microphone Array ◽  
Wave Tube

The effects of contaminating noise on the calculation of active acoustic intensity for pressure gradient methods

2019 ◽  
Vol 145 (1) ◽  
pp. 173-184 ◽  
Author(s):  
Mylan R. Cook ◽  
Kent L. Gee ◽  
Tracianne B. Neilsen ◽  
Scott D. Sommerfeldt
Keyword(s):  
Pressure Gradient ◽  
Gradient Methods ◽  
Acoustic Intensity
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