An Experimental Study of the Flow Field Over Wavy Beds Under Oscillatory Flow

2005 ◽  
Vol 48 (6) ◽  
pp. 1526-1535 ◽  
Author(s):  
Mian LIN ◽  
Zhi-Da YUAN
Keyword(s):  
Experimental Study ◽  
Flow Field ◽  
Oscillatory Flow

Experimental Study of Flow Oscillation in a Rectangular Jet-Driven Tube

1990 ◽  
Vol 112 (1) ◽  
pp. 23-27 ◽  
Author(s):  
J. Iwamoto
Keyword(s):  
Experimental Study ◽  
Flow Field ◽  
Steady Flow ◽  
Oscillatory Flow ◽  
Necessary Conditions ◽  
Experimental Results ◽  
Flow Oscillation ◽  
Rectangular Jet ◽  
Rectangular Tube

Several papers, mainly of a theoretical nature, have been published on the oscillatory flow in a Hartmann-Sprenger tube. Quantitative exploration of the flow field has proved difficult and details are lacking. In the present work, using a rectangular tube, synchronous shadow-photography has been applied to visualize the flow field during stable oscillatory flow. The measurement of pressure has also been made for the case of steady flow when both ends of the tube are open. From these experimental results the necessary conditions for starting and maintaining a stable oscillatory flow in an H-S tube have been established.

Experimental Study of Turbulent Macroinstabilities in an Agitated System with Axial High-Speed Impeller and with Radial Baffles

1996 ◽  
Vol 61 (6) ◽  
pp. 856-867 ◽  
Author(s):  
Oldřich Brůha ◽  
Ivan Fořt ◽  
Pavel Smolka ◽  
Milan Jahoda
Keyword(s):  
Experimental Study ◽  
Flow Field ◽  
High Speed ◽  
Experimental Results ◽  
Turbulent Regime ◽  
Frequency Of Occurrence ◽  
Visualization Method ◽  
Entire Flow

The frequency of turbulent macroinstability occurrence was measured in liquids agitated in a cylindrical baffled vessel. As it has been proved by preceding experimental results of the authors, the stochastic quantity with frequency of occurrence of 10-1 to 100 s-1 is concerned. By suitable choosing the viscosity of liquids and frequency of impeller revolutins, the region of Reynolds mixing numbers was covered from the pure laminar up to fully developed turbulent regime. In addition to the equipment making it possible to record automatically the macroinstability occurrence, also the visualization method and videorecording were employed. It enabled us to describe in more detail the form of entire flow field in the agitated system and its behaviour in connection with the macroinstability occurrence. It follows from the experiments made that under turbulent regime of flow of agitated liquids the frequency of turbulent macroinstability occurrence is the same as the frequency of the primary circulation of agitated liquid.

scholarly journals EXPERIMENTAL STUDY ON THE LOCAL EROSION VELOCITY DUE TO ASYMMETRY OSCILLATORY FLOW

1999 ◽  
Vol 15 ◽  
pp. 505-510
Author(s):  
Toshihiko YAMASHITA ◽  
Hirotugu KANEKO ◽  
Masaki NIIYAMA ◽  
Shinichiro NAGATA
Keyword(s):  
Experimental Study ◽  
Oscillatory Flow ◽  
Local Erosion

Oscillatory Natural Convection of a Liquid Metal in Circular Cylinders

1994 ◽  
Vol 116 (3) ◽  
pp. 627-632 ◽  
Author(s):  
Y. Kamotani ◽  
F.-B. Weng ◽  
S. Ostrach ◽  
J. Platt
Keyword(s):  
Experimental Study ◽  
Natural Convection ◽  
Liquid Metal ◽  
Oscillatory Flow ◽  
Circular Cylinders ◽  
Flow Structures ◽  
Supercritical Flow ◽  
Aspect Ratios ◽  
Oscillation Frequencies ◽  
Rayleigh Numbers

An experimental study is made of natural convection oscillations in gallium melts enclosed by right circular cylinders with differentially heated end walls. Cases heated from below are examined for angles of inclination (φ) ranging from 0 deg (vertical) to 75 deg with aspect ratios Ar (height/diameter) of 2, 3, and 4. Temperature measurements are made along the circumference of the cylinder to detect the oscillations, from which the oscillatory flow structures are inferred. The critical Rayleigh numbers and oscillation frequencies are determined. For Ar=3 and φ = 0 deg, 30 deg the supercritical flow structures are discussed in detail.

Sign in / Sign up

Export Citation Format

Share Document