Abstract
Experimental data on the critical pressure of ignition of titanium alloy fragments in gaseous oxygen are analyzed. The fragments are obtained after fracture of alloy samples in the dynamic mode (p *2 ) and under natural convection conditions (p *1 ). The results are analyzed with allowance for the heat transfer coefficients from material ignition initiators under similar conditions. Based on the shape of the experimental thermograms of plate cooling, the coefficient of heat transfer from microcraters with a juvenile surface formed due to knockout of metal particles from the plate by the high-velocity flow is found: α 2 ≈ 11 kW(m2 ·K). The value of α 2 is close to the value of this coefficient calculated with the use of the coefficient α 1 ≈ 5 kW/(m2 · K) of heat transfer from titanium rod microfragments (with the size of the order of metal grains) formed during titanium rod fracture in oxygen under conditions of natural convection with allowance for the ratio p *2 /p *1 .
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
V. I. Bolobov, “Mechanism of Self-Ignition of Titanium Alloys in Oxygen,” Fiz. Goreniya Vzryva 38 (6), 37–45 (2002) [Combust., Explos., Shock Waves 38 (6), 639–645 (2002)].
V. I. Bolobov, “Possible Mechanism of Autoignition of Titanium Alloys in Oxygen,” Fiz. Goreniya Vzryva 39 (6), 77–81 (2003) [Combust., Explos., Shock Waves 39 (6), 677–680 (2003)].
V. I. Bolobov and N. A. Podlevskikh, “Mechanism of Metal Ignition due to Fracture,” Fiz. Goreniya Vzryva 43 (4), 39–48 (2007) [Combust., Explos., Shock Waves 43 (4), 405–413 (2007)].
V. I. Bolobov, “Theory of Ignition of Metals at Fracture,” Fiz. Goreniya Vzryva 48 (6), 35–40 (2012) [Combust., Explos., Shock Waves 48 (6), 689–693 (2012)].
D. A. Frank-Kamenetskii, Diffusion and Heat Transfer in Chemical Kinetics (Nauka, Moscow, 1987) [in Russian].
F. E. Littman, F. M. Church, and E. M. Kinderman, “A Study of Metal Ignitions. The Spontaneous Ignition of Titanium,” J. Less-Common Metals 3, 367–378 (1961).
E. A. Borisova and K. V. Bardanov, “Ignition of Titanium Alloys in Oxygen-Containing Media,” Tsvetn. Metallurg., No. 2, 47–48 (1963).
V. I. Bolobov, “Deflagration of Titanium in an Oxygen Flow,” Fiz. Goreniya Vzryva 29 (2), 12–15 (1993) [Combust., Explos., Shock Waves 29 (2), 138–141 (1993)].
V. I. Bolobov, “Mechanism of Metal Ignition in an Oxygen Flow,” Fiz. Goreniya Vzryva 34 (1), 50–56 (1998) [Combust., Explos., Shock Waves 34 (1), 44–50 (1998)].
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © V.I. Bolobov.
Published in Fizika Goreniya i Vzryva, Vol. 52, No. 2, pp. 54–59, March–April, 2016.
Rights and permissions
About this article
Cite this article
Bolobov, V.I. Effect of heat transfer conditions on the critical pressure of metal ignition in oxygen. Combust Explos Shock Waves 52, 172–176 (2016). https://doi.org/10.1134/S0010508216020064
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0010508216020064