{"title":"The Process of Heat Transfer in a Coal Bed with Variation Thermophysical Properties","authors":"I. M. Abdulagatov, A. E. Ramazanova","doi":"10.1134/s0018151x23030069","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>New experimental thermodynamically consistent data are presented on the temperature dependence of thermal diffusivity, heat capacity, and thermal conductivity (λ = <i>a</i>ρ<i>C</i><sub><i>p</i></sub>) of black coal calculated on their basis. The effect of the thermal decomposition (pyrolysis) of coal near 700 K and evaporation of moisture and other easily volatile components of coal at 380 K on the behavior of heat capacity and thermal conductivity was studied experimentally. The measurements were carried out using the contact-free laser flash (Netzsch LFA 457) method in the temperature range 301–823 K. Based on the measured values of the thermal diffusivity of black coal, the heat transfer process in a coal bed was studied. It is shown that taking into account the temperature dependence of the thermal diffusivity of the medium when solving the heat transfer equation significantly affects the temperature distribution in the coal bed.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":"46 1","pages":""},"PeriodicalIF":1.0000,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"High Temperature","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1134/s0018151x23030069","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"PHYSICS, APPLIED","Score":null,"Total":0}
引用次数: 0
Abstract
New experimental thermodynamically consistent data are presented on the temperature dependence of thermal diffusivity, heat capacity, and thermal conductivity (λ = aρCp) of black coal calculated on their basis. The effect of the thermal decomposition (pyrolysis) of coal near 700 K and evaporation of moisture and other easily volatile components of coal at 380 K on the behavior of heat capacity and thermal conductivity was studied experimentally. The measurements were carried out using the contact-free laser flash (Netzsch LFA 457) method in the temperature range 301–823 K. Based on the measured values of the thermal diffusivity of black coal, the heat transfer process in a coal bed was studied. It is shown that taking into account the temperature dependence of the thermal diffusivity of the medium when solving the heat transfer equation significantly affects the temperature distribution in the coal bed.
摘要 提供了关于黑煤的热扩散率、热容量和热导率（λ = aρCp）的温度依赖性的热力学一致的新实验数据。实验研究了 700 K 附近煤的热分解（热解）以及 380 K 煤中水分和其他易挥发成分的蒸发对热容量和热导率行为的影响。根据黑煤热扩散率的测量值，研究了煤层中的传热过程。结果表明，在求解传热方程时，考虑介质热扩散率的温度依赖性会显著影响煤层中的温度分布。
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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