Optical study of a light diaphragm rupture process in an expansion tube

Shock Waves ◽  
2000 ◽  
Vol 10 (3) ◽  
pp. 167-178 ◽  
Author(s):  
Margaret Wegener ◽  
Mark Sutcliffe ◽  
Richard Morgan
Keyword(s):  
Rupture Process ◽  
Optical Study ◽  
Expansion Tube ◽  
Diaphragm Rupture

Effect of Finite Diaphragm Rupture Process on Microshock Tube Flows

2013 ◽  
Vol 135 (8) ◽  
Author(s):  
Arun K. R ◽  
H. D. Kim ◽  
T. Setoguchi
Keyword(s):  
Supersonic Flow ◽  
Flow Field ◽  
Shock Front ◽  
Supersonic Nozzle ◽  
Propagation Speed ◽  
Propagation Distance ◽  
Rupture Process ◽  
Shock Propagation ◽  
Diaphragm Rupture ◽  
Contact Distance

The study of flow physics in microshock tubes is of growing importance with the recent development of microscale technology. The flow characteristics in a microshock tube is considerably different from that of the conventional macroshock tube due to the boundary layer effects and high Knudsen number effects. In the present study an axisymmetric computational fluid dynamics (CFD) method was employed to simulate the microshock tube flow field with Maxwell's slip velocity and temperature jump boundary conditions, to accommodate the rarefaction effects. The effects of finite diaphragm rupture process and partial diaphragm rupture on the flow field and the wave propagations were investigated, in detail. The results show that the shock propagation distance attenuates rapidly for a microshock tube compared to a macroshock tube. For microshock tubes, the contact surface comes closer to the shock front compared to the analytical macroshock tube case. Due to the finite diaphragm rupture process the moving shock front will be generated after a certain distance ahead of the diaphragm and get attenuated rapidly as it propagates compared to the sudden rupture case. The shock-contact distance reduces considerably for the finite diaphragm rupture case compared to the sudden diaphragm rupture process. A partially burst diaphragm within a microshock tube initiates a supersonic flow in the vicinity of the diaphragm similar to that of a supersonic nozzle flow. The supersonic flow expansion leads to the formation of oblique shock cells ahead of the diaphragm and significantly attenuates the moving shock propagation speed.

scholarly journals Computational Study on Micro Shock Tube Flows with Gradual Diaphragm Rupture Process

2012 ◽  
Vol 02 (04) ◽  
pp. 235-241 ◽  
Author(s):  
Arun Kumar Rajagopal ◽  
Heuy Dong Kim ◽  
Toshiaki Setoguchi
Keyword(s):  
Shock Tube ◽  
Computational Study ◽  
Rupture Process ◽  
Diaphragm Rupture

Electron Optical Study of Surface Morphologies of Crystals

1980 ◽  
Vol 38 ◽  
pp. 376-377
Author(s):  
Sumio Iijima ◽  
Tung Hsu
Keyword(s):  
Thin Film ◽  
Optical Study ◽  
Regular Array ◽  
Surface Steps ◽  
Diffracted Waves ◽  
Image Position ◽  
Surface Morphologies

Suppose the thickness of a thin film of a crystal varies periodically like a regular array of surface steps, kinematical intensities of diffracted waves from this crystal are modulated by a shape transform,

Optical measurements for a superorbital expansion tube

1997 ◽  
Author(s):  
Margaret Wegener ◽  
Alexis Bishop ◽  
Amberyn Thomas ◽  
Margaret Wegener ◽  
Alexis Bishop ◽  
...  
Keyword(s):  
Optical Measurements ◽  
Expansion Tube
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