Flow Regulation Characteristics of Thin-Walled Compliant Tubes: Part II—Experimental Verification and Design of the Wave-Speed Flow Regulator

1990 ◽  
Vol 112 (3) ◽  
pp. 330-337
Author(s):  
Ifiyenia Kececioglu
Keyword(s):  
Reynolds Number ◽  
High Reynolds Number ◽  
Wave Speed ◽  
Tube Flow ◽  
Flow Limitation ◽  
Reynolds Number Flow ◽  
Speed Flow ◽  
Number Flow ◽  
Flow Regulator ◽  
High Reynolds

The theoretical foundation of the two different mechanisms of compliant-tube flow limitation when the flow is either friction dominated (frictional flow limitation for low-Reynolds-number flow) or inertia dominated (wave-speed flow limitation for high-Reynolds-number flow) was formulated in Part I [1] of this paper. In this part of the paper, the high-Reynolds-number wave-speed flow limitation behavior of compliant tubes is verified experimentally and applied to the design of a flow regulator employing a collapsible tube as its active element. Criteria for the design of an inertia-dominated compliant-tube flow regulator are established and checked against findings of experiments.

scholarly journals The Effect of Surface Roughness of a Body in the High Reynolds-Number Flow

1995 ◽  
Vol 2 (1) ◽  
pp. 23-32
Author(s):  
Tsutomu adachi
Keyword(s):  
Surface Roughness ◽  
Reynolds Number ◽  
High Reynolds Number ◽  
The Body ◽  
Reynolds Number Flow ◽  
Flow Phenomena ◽  
Number Flow ◽  
High Reynolds ◽  
Cryogenic Wind Tunnel ◽  
Effect Of Surface

In this paper, first, the principle, structures, operations, and performances of the cryogenic wind tunnel are described. By changing the pressure, temperature and velocity of gas a high Reynolds-number flow(5×104<Re<107)can be obtained. From the research results, a high Reynolds-number flow with comparatively low power, LN consumptions was attained. It was with Mach-number independent of each other, o show some examples of high Reynolds-number flow, the effects of surface roughness and grooves on the surface of a cylinder on the flow are measured using models with various values of roughness and size. A model test of an airship was also conducted. With the high Reynolds-number flow, the thickness of the boundary layer becomes thinner. Then the surface conditions of a body have great effect on the flow phenomena and on the drag of the body. Some attempts to reduce the drag of the body were shown.

Numerical Computation for Flow-Induced Oscillations of a Circular Cylinder

2010 ◽  
Author(s):  
Norio Kondo
Keyword(s):  
Reynolds Number ◽  
Circular Cylinder ◽  
High Reynolds Number ◽  
Numerical Results ◽  
High Mass ◽  
Mass Ratio ◽  
Reynolds Number Flow ◽  
Wide Range ◽  
Number Flow ◽  
High Reynolds

This paper presents numerical results for flow-induced oscillations of an elastically supported circular cylinder, which is immersed in a high Reynolds number flow. The flow-induced oscillations of the circular cylinder at subcritical Reynolds numbers have been investigated by many researchers, and the interested phenomena with respect to the oscillations have been found in a wide range of the Scruton number. For the flow-induced oscillation of the circular cylinder with high mass ratio, it is well-known that there is the peak value of amplitudes at near the critical reduced velocity. Therefore, we computer flow-induced oscillations of a circular cylinder with a mass ratio of 8, which is placed in a high Reynolds number flow, by three-dimensional simulation, and the numerical results are compared with the results of flow-induced oscillations of the circular cylinder immersed in a subcritical Reynolds number flow.

Sign in / Sign up

Export Citation Format

Share Document