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Kinetic effects in thermal explosion with oscillating ambient conditions.

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Thermal explosion in oscillating ambient conditions.

Vasily Novozhilov1

  • 1Centre for Environmental Safety and Risk Engineering, Victoria University, Werribee VIC 3030, Australia.

Scientific Reports
|July 23, 2016
PubMed
Summary

This study introduces the thermal explosion problem with oscillating ambient temperatures, crucial for understanding fires and combustion. It reveals critical conditions influenced by temperature oscillations and a novel unsteady thermal explosion behavior.

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Area of Science:

  • Combustion Science
  • Thermal Explosion Theory
  • Fire Safety Engineering

Background:

  • Thermal explosion theory traditionally assumes constant ambient temperatures.
  • Real-world scenarios, like seasonal variations, involve oscillating ambient temperatures.
  • Understanding autoignition under fluctuating temperatures is vital for various materials.

Purpose of the Study:

  • To analyze the thermal explosion problem for a medium with oscillating ambient temperatures.
  • To investigate the influence of oscillation parameters on critical conditions.
  • To explore novel unsteady thermal explosion behaviors.

Main Methods:

  • Adopting a formulation consistent with classical thermal explosion studies.
  • Quantifying the effects of oscillation frequency and amplitude.
  • Analyzing results for planar symmetry and temporal development.

Main Results:

  • Critical conditions for thermal explosion are determined by ambient temperature oscillation parameters.
  • The frequency and amplitude of oscillations significantly impact thermal runaway.
  • A new type of unsteady thermal explosion was identified, with runaway occurring after multiple oscillation cycles.

Conclusions:

  • Oscillating ambient temperatures introduce new critical factors in thermal explosion analysis.
  • The study quantifies the impact of these oscillations, offering insights for fire safety.
  • A previously undiscovered unsteady thermal explosion phenomenon has been characterized.