Measurement of vibrational relaxation time of oxygen between 475° and 675°K using an acoustic resonant technique

1981 ◽  
Vol 70 (S1) ◽  
pp. S90-S90
Author(s):  
I‐an Feng ◽  
Mark C. Lee
Keyword(s):  
Relaxation Time ◽  
Vibrational Relaxation

On the breakdown of characteristics solutions in flows with vibrational relaxation

1967 ◽  
Vol 27 (1) ◽  
pp. 49-57 ◽  
Author(s):  
B. S. H. Rarity
Keyword(s):  
Relaxation Time ◽  
Mach Number ◽  
Supersonic Flow ◽  
Steady Flow ◽  
Speed Of Sound ◽  
Vibrational Relaxation ◽  
Precise Measure ◽  
Derivatives Of ◽  
Relaxing Gas ◽  
Flow Case

The breakdown of the characteristics solution in the neighbourhood of the leading frozen characteristic is investigated for the flow induced by a piston advancing with finite acceleration into a relaxing gas and for the steady supersonic flow of a relaxing gas into a smooth compressive corner. It is found that the point of breakdown moves outwards along the leading characteristic as the relaxation time decreases and that there is no breakdown of the solution on the leading characteristic if the gas has a sufficiently small, but non-zero, relaxation time. A precise measure of this relaxation time is derived. The paper deals only with points of breakdown determined by initial derivatives of the piston path or wall shape. In the steady-flow case, the Mach number based on the frozen speed of sound must be greater than unity.

Effect of ozone on the vibrational relaxation time of oxygen

1973 ◽  
Vol 59 (10) ◽  
pp. 5725-5728 ◽  
Author(s):  
J. G. Parker ◽  
D. N. Ritke
Keyword(s):  
Relaxation Time ◽  
Vibrational Relaxation

Measurement of the vibrational relaxation time in metal-phthalocyanine solutions

1997 ◽  
Vol 7 (3) ◽  
pp. 89-94 ◽  
Author(s):  
R. Rangel-Rojo ◽  
G. Spruce ◽  
B.S. Wherrett
Keyword(s):  
Relaxation Time ◽  
Vibrational Relaxation ◽  
Metal Phthalocyanine

scholarly journals On the interpretation of measured rotational and vibrational relaxation times. I. Sound dispersion experiments

1976 ◽  
Vol 54 (2) ◽  
pp. 329-341 ◽  
Author(s):  
Huw O. Pritchard ◽  
Nabil I. Labib
Keyword(s):  
Relaxation Time ◽  
Diatomic Molecule ◽  
Vibrational Relaxation ◽  
Transition Probabilities ◽  
Relaxation Times ◽  
Normal Modes ◽  
Heat Bath ◽  
Inert Gas ◽  
Sound Dispersion ◽  
Approximate Treatment

The simultaneous relaxation to equilibrium of both rotational and vibrational populations is considered for a diatomic molecule immersed in a heat bath of inert-gas atoms. The relaxation is analyzed in terms of normal modes of relaxation, and it is shown that each mode, having its own distinct relaxation time, in general has both rotational and vibrational components. The qualitative form of these modes is very persistent, and survives considerable variations in the assumed temperature and the assumed set of transition probabilities. Using these modes of relaxation, an approximate treatment is given of the contribution made by the diatomic gas to the sound dispersion of the mixture, and conditions under which modes of relaxation may or may not be resolved from each other, or may be characterized as either 'rotational' or 'vibrational' are examined.

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