Supersonic laminar flow development in a square duct

AIAA Journal ◽  
1987 ◽  
Vol 25 (1) ◽  
pp. 175-177 ◽  
Author(s):  
D. O. Davis ◽  
F. B. Gessner ◽  
G. D. Kerlick
Keyword(s):  
Laminar Flow ◽  
Square Duct ◽  
Flow Development ◽  
Supersonic Laminar

Measurement of Laminar Flow Development in a Square Duct Using a Laser-Doppler Flowmeter

1967 ◽  
Vol 34 (4) ◽  
pp. 813-818 ◽  
Author(s):  
R. J. Goldstein ◽  
D. K. Kreid
Keyword(s):  
Laminar Flow ◽  
Precision Measurement ◽  
Fluid Velocity ◽  
Flow Distribution ◽  
Flow Region ◽  
Optical Technique ◽  
Fully Developed Flow ◽  
Square Duct ◽  
Flow Development ◽  
Doppler Flowmeter

A system for precision measurement of fluid velocity is developed and applied to determine the laminar flow distribution in a square duct. The experimental technique consists of measuring the Doppler shift of laser radiation scattered by particles moving with the fluid. From this frequency shift, the fluid velocity is inferred. Measurements in the entrance region and fully developed flow region of a square duct indicate that the velocity profile development takes place in a somewhat longer section of the duct than had been predicted. Measurements of the fully developed flow indicate that the optical technique used is capable of measuring velocity within an accuracy of at least 0.1 percent.

Supersonic laminar flow on the windward surface of yawed wings of infinite span over a broad range of Reynolds numbers

1992 ◽  
Vol 26 (4) ◽  
pp. 508-512
Author(s):  
I. V. Vershinin ◽  
G. A. Tirskii ◽  
S. V. Utyuzhnikov
Keyword(s):  
Laminar Flow ◽  
Reynolds Numbers ◽  
Windward Surface ◽  
Supersonic Laminar

Viscous Heating and Varying Viscosity Effects on Developing Laminar Flow in a Circular Pipe

1973 ◽  
Vol 187 (1) ◽  
pp. 435-445 ◽  
Author(s):  
B. W. Martin
Keyword(s):  
Laminar Flow ◽  
Pipe Wall ◽  
Circular Cross Section ◽  
Viscosity Reduction ◽  
Viscous Heating ◽  
Reduced Pressure ◽  
Pressure Drops ◽  
Flow Development ◽  
Viscosity Effects ◽  
Varying Viscosity

An integral profile procedure is used to predict the effects of viscous heating and viscosity reduction on laminar flow development in a uniform pipe of circular cross-section under adiabatic conditions. The effects on fluid and pipe wall temperature, though small in the entrance region for conditions likely to be encountered in practice, become significant for viscous fluids in well-developed flow; the reduced pressure drops predicted relative to isothermal flow compare favourably with available measurements when allowance is made for the possibility of axial conduction therein.

The Torsion Effect on Fully Developed Laminar Flow in Helical Square Ducts

1993 ◽  
Vol 115 (2) ◽  
pp. 292-301 ◽  
Author(s):  
Wen-Hwa Chen ◽  
Ray Jan
Keyword(s):  
Laminar Flow ◽  
Secondary Flow ◽  
Friction Factor ◽  
Stokes Equations ◽  
Axial Flow ◽  
Outer Wall ◽  
Square Duct ◽  
Torsion Effect ◽  
Inclined Angle ◽  
Curvature And Torsion

The continuity equation and Navier-Stokes equations derived from a non-orthogonal helical coordinate system are solved by the Galerkin finite-element method in an attempt to study the torsion effect on the fully developed laminar flow in the helical square duct. Since high-order terms of curvature and torsion are considered, the approach is also applicable to the problems with finite curvature and torsion. The interaction effects of curvature, torsion, and the inclined angle of the cross section on the secondary flow, axial velocity, and friction factor in the helical square duct are presented. The results show that the torsion has more pronounced effect on the secondary flow rather than the axial flow. In addition, unlike the flow in the toroidal square duct, Dean’s instability of the secondary flow, which occurs near the outer wall in the helical square duct, can be avoided due to the effects of torsion and/or inclined angle. In such cases, a decrease of the friction factor is observed. However, as the pressure gradient decreases to a small value, the friction factor for the toroidal square duct is also applicable to the helical square duct.

scholarly journals Численное исследование вихревых структур и теплообмена при сверхзвуковом обтекании области сопряжения затупленного тела и пластины

2020 ◽  
Vol 90 (2) ◽  
pp. 185
Author(s):  
Е.В. Колесник ◽  
Е.М. Смирнов
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Reynolds Number ◽  
Mach Number ◽  
Laminar Flow ◽  
Numerical Data ◽  
Qualitative And Quantitative ◽  
Plate Length ◽  
Gas Dynamic ◽  
Supersonic Laminar

In the paper, the results of numerical simulation of a supersonic laminar flow past a fin-body junction are presented. The gas-dynamic and vortex structure of the flow, determined by viscous-inviscid interaction, is analyzed. Numerical data showing the qualitative and quantitative effects on the flow structure and heat transfer of the following parameters: Mach number, Reynolds number, temperature factor and plate length, are presented

Experiments on supersonic turbulent flow development in a square duct

AIAA Journal ◽  
1987 ◽  
Vol 25 (5) ◽  
pp. 690-697 ◽  
Author(s):  
F. B. Gessner ◽  
S. D. Ferguson ◽  
C. H. Lo
Keyword(s):  
Turbulent Flow ◽  
Square Duct ◽  
Flow Development
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