S. A. Bordzilovskii, S. M. Karakhanov, A. V. Plastinin
{"title":"Relaxation of Light Emission from Hot Spots Depending on the Characteristics of the Environment","authors":"S. A. Bordzilovskii, S. M. Karakhanov, A. V. Plastinin","doi":"10.1134/s0010508223050088","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The light emission from samples consisting of a transparent matrix with inclusions of hot spots was studied. The matrix material was water and epoxy resin. Hot spots were generated by shock compression of MS-V hollow glass microballoons. In the pressure range 0.7–29 GPa, a brightness decay time of 280 to 70 ns was recorded. The brightness decay time increased by more than an order of magnitude when replacing the optical window made of solid epoxy resin by LiF. However, even this increased time of brightness decay is much shorter than the estimated times of hot-spot temperature relaxation due to heat conduction in the calculation with stationary parameters (<span>\\(t_{a} = 10^{- 2}\\)</span> s) and due to light emission (<span>\\(\\tau = 2.4 \\cdot 10^{-3}\\)</span> s). It is concluded that the dominant mechanism of temperature relaxation is the turbulent mixing of the medium behind the shock-wave front. The experimental results show that in numerical simulations of the temperature field during shock-wave propagation through a pore, it is necessary to take into account the viscosity and strength of the matrix material.</p>","PeriodicalId":10509,"journal":{"name":"Combustion, Explosion, and Shock Waves","volume":"6 6","pages":""},"PeriodicalIF":0.9000,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Combustion, Explosion, and Shock Waves","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1134/s0010508223050088","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
引用次数: 0
Abstract
The light emission from samples consisting of a transparent matrix with inclusions of hot spots was studied. The matrix material was water and epoxy resin. Hot spots were generated by shock compression of MS-V hollow glass microballoons. In the pressure range 0.7–29 GPa, a brightness decay time of 280 to 70 ns was recorded. The brightness decay time increased by more than an order of magnitude when replacing the optical window made of solid epoxy resin by LiF. However, even this increased time of brightness decay is much shorter than the estimated times of hot-spot temperature relaxation due to heat conduction in the calculation with stationary parameters (\(t_{a} = 10^{- 2}\) s) and due to light emission (\(\tau = 2.4 \cdot 10^{-3}\) s). It is concluded that the dominant mechanism of temperature relaxation is the turbulent mixing of the medium behind the shock-wave front. The experimental results show that in numerical simulations of the temperature field during shock-wave propagation through a pore, it is necessary to take into account the viscosity and strength of the matrix material.
期刊介绍：
Combustion, Explosion, and Shock Waves a peer reviewed journal published in collaboration with the Siberian Branch of the Russian Academy of Sciences. The journal presents top-level studies in the physics and chemistry of combustion and detonation processes, structural and chemical transformation of matter in shock and detonation waves, and related phenomena. Each issue contains valuable information on initiation of detonation in condensed and gaseous phases, environmental consequences of combustion and explosion, engine and power unit combustion, production of new materials by shock and detonation waves, explosion welding, explosive compaction of powders, dynamic responses of materials and constructions, and hypervelocity impact.
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