随机中温场中单个粒子的热爆炸

IF 1 4区 物理与天体物理 Q4 PHYSICS, APPLIED
I. V. Derevich, A. K. Klochkov
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引用次数: 0

摘要

摘要 针对介质湍流温度场中发生放热化学反应的单个粒子的热爆炸提出了一个模型。化学反应速率用修正的阿伦尼乌斯定律表示,该定律考虑了粒子材料内部结构的变化。温度波动采用高斯随机过程建模。研究采用了拉格朗日法和欧拉法。在拉格朗日方法中,通过求解随机常微分方程系统,计算了介质和粒子群的随机温度波动。根据粒子群的数值模拟结果,模拟随机粒子温度分布的经验概率密度函数的动态变化。在欧拉方法中,推导出了随机粒子温度概率密度函数的非稳态闭环方程,并使用原始保守差分方案对其进行数值积分。两种方法的计算结果相互吻合,令人满意。结果表明,介质的随机温度场从本质上改变了热爆炸的发生动力学。在随机温度场中,只要在确定性情况下系统绝对稳定,就会发生热爆炸。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Thermal Explosion of Single Particles in a Random Medium-Temperature Field

Thermal Explosion of Single Particles in a Random Medium-Temperature Field

Abstract

A model is proposed for the thermal explosion of a single particle with an exothermic chemical reaction in a turbulent temperature field of the medium. The chemical reaction rate is represented by a modified Arrhenius law, which takes into account changes in the internal structure of the particle material. Temperature fluctuations are modeled by a Gaussian random process. The study was carried out using the Lagrange and Euler approaches. In the Lagrange approach, in which a system of stochastic ordinary differential equations is solved, random temperature fluctuations of the medium and particle ensemble are calculated. Based on the results of numerical simulation of the ensemble, the dynamics of the empirical probability density function of the random particle temperature distribution is simulated. In the Euler approach, a nonstationary closed-loop equation is derived for the probability density function of random particle temperatures, which is numerically integrated using an original conservative difference scheme. The calculation results for both approaches agree satisfactorily with each other. It is shown that a random temperature field of the medium qualitatively changes the dynamics of occurrence of a thermal explosion. In a random temperature field, a thermal explosion can occur provided that in a deterministic case, the system is absolutely stable.

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来源期刊
High Temperature
High Temperature 物理-物理:应用
CiteScore
1.50
自引率
40.00%
发文量
0
审稿时长
4-8 weeks
期刊介绍: High Temperature is an international peer reviewed journal that publishes original papers and reviews written by theoretical and experimental researchers. The journal deals with properties and processes in low-temperature plasma; thermophysical properties of substances including pure materials, mixtures and alloys; the properties in the vicinity of the critical point, equations of state; phase equilibrium; heat and mass transfer phenomena, in particular, by forced and free convections; processes of boiling and condensation, radiation, and complex heat transfer; experimental methods and apparatuses; high-temperature facilities for power engineering applications, etc. The journal reflects the current trends in thermophysical research. It presents the results of present-day experimental and theoretical studies in the processes of complex heat transfer, thermal, gas dynamic processes, and processes of heat and mass transfer, as well as the latest advances in the theoretical description of the properties of high-temperature media.
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