The role of cellular instability on the critical tube diameter problem for unstable gaseous detonations

2019 ◽  
Vol 37 (3) ◽  
pp. 3545-3553 ◽  
Author(s):  
Han Xu ◽  
Xiaocheng Mi ◽  
Charles B. Kiyanda ◽  
Hoi Dick Ng ◽  
John H.S. Lee ◽  
...  
Keyword(s):  
Tube Diameter ◽  
Gaseous Detonations ◽  
Critical Tube Diameter

scholarly journals Response of critical tube diameter phenomenon to small perturbations for gaseous detonations

Shock Waves ◽  
2013 ◽  
Vol 24 (2) ◽  
pp. 219-229 ◽  
Author(s):  
N. Mehrjoo ◽  
B. Zhang ◽  
R. Portaro ◽  
H. D. Ng ◽  
J. H. S. Lee
Keyword(s):  
Tube Diameter ◽  
Small Perturbations ◽  
Gaseous Detonations ◽  
Critical Tube Diameter

The diffraction of a planar detonation wave at an abrupt area change

1979 ◽  
Vol 95 (1) ◽  
pp. 79-96 ◽  
Author(s):  
D. H. Edwards ◽  
G. O. Thomas ◽  
M. A. Nettleton
Keyword(s):  
Detonation Wave ◽  
Critical Diameter ◽  
Cylindrical Tube ◽  
Tube Diameter ◽  
Zone Length ◽  
Area Change ◽  
Expansion Fan ◽  
The One ◽  
Critical Tube Diameter ◽  
Smoked Foil

Previous experimental work on the diffraction of a detonation wave at a large and abrupt area change in a tube, has shown that every system is characterized by a critical tube diameter at which quenching of the detonation occurs. Zeldovich, Kogarko & Simonov (1956) established that the critical tube diameter, for the oxy-acetylene system with varying dilution of nitrogen, lies between 500 and 700 times the one-dimensional induction zone length. Later, Mitrovanov & Soloukhin (1964) discovered that, for the same system, the critical diameter is 10 or 13 times the transverse wave spacing for a flat channel and cylindrical tube respectively. The two results are shown to be equivalent and are confirmed by further experiments in a 75 × 6 mm channel in which the flow is two-dimensional.Smoked foil and schlieren records show that, for supercritical waves, re-ignition occurs at sites along the wedge formed by the head of the expansion from the diffracting aperture and criticality is attained when the site is located at the apex of the wedge. A universal feature of re-initiation, which is also observed in liquid and solid explosives, is the sudden appearance of a transverse detonation which sweeps through the compressed, but unreacted, gas of the dissociated shock-reaction zone regime; this is signalled by the appearance of fine triple-point writing on smoked-foil records.A criterion for re-initiation is formulated by equating the critical velocity gradient which characterizes the decay of the wavefront in a cell, to that obtaining in the diffracted shock front at the head of the expansion fan; an expression for the latter is derived from Whitham's (1957) theory for non-reactive shocks. The prediction of the criterion is in good agreement with observation.

Role of surface tension and tube diameter in film condensation on horizontal tubes

AIChE Journal ◽  
1967 ◽  
Vol 13 (3) ◽  
pp. 613-614 ◽  
Author(s):  
C. L. Henderson ◽  
J. M. Marchello
Keyword(s):  
Surface Tension ◽  
Tube Diameter ◽  
Film Condensation ◽  
Horizontal Tubes

The critical tube diameter in a two reaction steps detonation: the H2/NO2 mixture case

Shock Waves ◽  
2008 ◽  
Vol 18 (4) ◽  
pp. 269-276 ◽  
Author(s):  
D. Desbordes ◽  
F. Joubert ◽  
F. Virot ◽  
B. Khasainov ◽  
H.-N. Presles
Keyword(s):  
Tube Diameter ◽  
Critical Tube Diameter
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