Effect of Surface Microstructure on the Temperature sensitivity of Burning Rate of Ammonium Perchlorate

  • K. Kishore Indian Institute of Science, Bangalore
  • K. Sridhara Indian Institute of Science, Bangalore
Keywords: Thermodynamics, Vielle law

Abstract

Considering Vielle's law and the new thermodynamic model which the authors have developed recently the true dependence of temperature sensitivity of burning rate of ammonium perchlorate (AP) on pressure is resolved and experimentally verified for bellet burning. The value of decreases with pressure steeply in regime I' (below 20 atm), but gently in regime I (above 20 atm). The value of powder AP has been determined and it is observed that (powder) > (pellet), which clearly suggests that of is innuenced by the surface temperature sensitive parameter and hence by the surface/subsurface microstructure. In powder burning, the buoyant lifting of the particles into the gas phase occurs, Which constitutes the so-called 'free board region' (FER) extending just above the true surface. Consequent to the decomposition of AP particles in FER, the condensed phase heat release gets curtailed and (powder) becomes larger. A general relationship for in terms of density and surface temperature is suggested, which is applicable to both pellet and powder AP.

Author Biographies

K. Kishore, Indian Institute of Science, Bangalore
Dr K Kishore is Professor at the Indian Institute of Science, Bangalord. He reCievedhis PhD from Gorakhpur University in 1967. He was invited by the Royal Society and Nuffield Foundation (London), Bursary, in 1972 to work at the University of Leeds (UK). He received UNESCO Senior Fellowship (1982) in USA and Japan. Hel was awarded prestigious Shanti Swarup Bhatnagar Award in 1988. He received Netzsch-Indian Thermal Analysis Society " ward for the year 1991. He was the Guide for about twenty PhD students and has over 250 publications to his credit. He is Fellow of the Inclian Academy of Sciences, Bangalore and National Acedemy of Science, Allahabad. He served as a member of the International Union of Pure & Applied Chemistry (IUPAC) Commission on macromolecular nomenclature. He was also a consultant at Du Pont's Eurolfean Technical Centre, Geneva. He is a member of the Management Aflvisory Committee for Young Scientists and Project Advisory Com"1ittee in Physical Chemistry in the Department of Science and Technology, New Delhi. He was a member of the Editorial Board, Journal of Applied Polymer Science during 1995-96 and Editorial Advisory BoarU, Journal of Polymeric Materials. He also contributed a chaptef for the book 'Fundamentals of Combustion on Composite Solid Propellant  brought out by the American Institute of Aeronautics and Astronautics (1984), New York.
K. Sridhara, Indian Institute of Science, Bangalore
Dr K Srldhara receive'd his MSc from Bangalore University in 1980. He obtained his PhD in Combustion Chemistry from Indian Institute of Science, Bangalore, m 1991, where he is working presently. He was the recepient of Prof B Sanjeeva Rao Memorial Lefture Prize for the year 1980 awarded by Bangalore Uni versity Chemical Society. His current, research interest is in the combustion of hybrid propellants.
Published
2013-01-01
How to Cite
Kishore, K., & Sridhara, K. (2013). Effect of Surface Microstructure on the Temperature sensitivity of Burning Rate of Ammonium Perchlorate. Defence Science Journal, 47(2), 177-184. https://doi.org/10.14429/dsj.47.3993
Section
Chemical Science & Technology

Most read articles by the same author(s)