کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6659755 1426192 2018 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Thermophysical properties of liquid Co measured by electromagnetic levitation technique in a static magnetic field
ترجمه فارسی عنوان
خواص ترموفیزیکی مواد مایع توسط روش الکترومغناطیسی در یک میدان مغناطیسی استاتیک اندازه گیری شده است
کلمات کلیدی
تراکم، تابش الکترومغناطیسی، ظرفیت حرارتی در فشار ثابت، هدایت حرارتی،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی
Density, normal spectral emissivity, heat capacity, and thermal conductivity of liquid Co were measured by an electromagnetic levitation technique in a static magnetic field. High-purity Co (99.9995 mass%) prepared by an anion exchange method was used for the measurements. Uncertainty analysis was conducted for all experimental data. The emissivity data at 807 nm deviated from the Drude model, owing to interband transitions of electrons. The heat capacity was successfully measured at a low magnetic field of 3 T with some residual convection within the droplet. However, for thermal conductivity measurements, a larger magnetic field was required to suppress convection, which made the levitation unstable owing to the magnetic force. Although the thermal conductivity data showed a relatively large scatter, the data agreed with the Wiedemann-Franz law at low temperatures. At higher temperatures, the experimental data deviated from the Wiedemann-Franz law. For heat capacity measurements, translational motion of the Co droplet should be suppressed, while thermal transportation by convection flow in the droplet should be preserved. Conversely, for thermal conductivity measurements, the convection flow should also be suppressed. Therefore, in this study, the heat capacity and thermal conductivity of Co were measured under static magnetic fields of 3 and 9 T, respectively. Moreover, our experimental results were compared with free electron models, namely, the Drude model and Wiedemann-Franz law.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Chemical Thermodynamics - Volume 121, June 2018, Pages 145-152
نویسندگان
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