An experimental study of gas-bubble evolution on a single exposure to a variable pressure field

2013 ◽  
Vol T155 ◽  
pp. 014015
Author(s):  
A V Pavlenko ◽  
O E Shestachenko ◽  
A A Tyaktev ◽  
Yu A Piskunov ◽  
V N Popov ◽  
...  
Keyword(s):  
Experimental Study ◽  
Pressure Field ◽  
Variable Pressure ◽  
Gas Bubble ◽  
Single Exposure ◽  
Bubble Evolution

Bubble Growth During Decompression of a Liquid

1981 ◽  
Vol 103 (1) ◽  
pp. 56-60 ◽  
Author(s):  
Y. S. Cha ◽  
R. E. Henry
Keyword(s):  
Vapor Bubble ◽  
Pressure Field ◽  
Constant Pressure ◽  
Variable Pressure ◽  
Gas Bubble ◽  
Vapor Bubbles ◽  
Diffusion Controlled ◽  
Special Cases ◽  
Present Solution ◽  
Cartesian Coordinate

The solution of the diffusion equation in spherical coordinates subject to time-dependent boundary conditions is derived. The solution can be employed to describe the growth of either a diffusion-controlled gas bubble or a heat transfer-controlled vapor bubble provided that convection effect is negligible. It is shown that the Epstein-Plesset solution for a gas bubble in a constant pressure field and the Jones-Zuber solution in a Cartesian coordinate system for a vapor bubble in a variable pressure field are special cases of the present solution. Numerical results obtained from the present analysis compare favorably with available experimental data for the growth of both gas and vapor bubbles during decompression processes.

Experimental Study of a Variable Pressure Damper on Automotive Valve Motion

1996 ◽  
Author(s):  
Jin-Jang Liou ◽  
Grodrue Huang ◽  
Wensyang Hsu
Keyword(s):  
Experimental Study ◽  
Friction Coefficient ◽  
Friction Force ◽  
High Speed ◽  
Experimental Results ◽  
Variable Pressure ◽  
Friction Forces ◽  
Valve Spring ◽  
Valve Motion

Abstract A variable pressure damper (VPD) is used here to adjusted the friction force on the valve spring to investigate the relation between the friction force and the valve bouncing phenomenon. The friction force on the valve spring is found experimentally, and the corresponding friction coefficient is also determined. Dynamic valve displacements at different speeds with different friction forces are calibrated. Bouncing and floating of the valve are observed when the camshaft reaches high speed. From the measured valve displacement, the VPD is shown to have significant improvement in reducing valve bouncing distance and eliminating floating. However, experimental results indicate that the valve bouncing can not be eliminated completely when the camshaft speed is at 2985 rpm.

scholarly journals Bubble parameters and efficiency of gas bubble evolution for a chlorine-, a hydrogen- and an oxygen-evolving wire electrode

1988 ◽  
Vol 33 (6) ◽  
pp. 769-779 ◽  
Author(s):  
J.M. Chin Kwie Joe ◽  
L.J.J. Janssen ◽  
S.J.D. van Strelen ◽  
J.H.G. Verbunt ◽  
W.M. Sluyter
Keyword(s):  
Gas Bubble ◽  
Wire Electrode ◽  
Bubble Evolution ◽  
Oxygen Evolving
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