کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4992626 1457392 2017 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Experimental investigations on temperature-dependent effective thermal conductivity of nanoporous silica aerogel composite
ترجمه فارسی عنوان
تحقیقات آزمایشگاهی در مورد قابلیت هدایت حرارتی مؤثر بر دمای کامپوزیت آئروژل سیلیکائی نانوپروس
کلمات کلیدی
کامپوزیت سیلیکا آرژول، هدایت حرارتی، وابسته به دما، آزمایش های دما بالا، الگوریتم ژنتیک،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
This paper presents an inverse method for retrieving temperature-dependent effective thermal conductivity of nanoporous silica aerogel composite at temperature ranging from 280 K to 1080 K and gas pressure between 0.01 Pa and 100 kPa from experimentally measured transient temperature data. This was achieved by combining a forward method solving combined conductive and radiative heat transfer accounting for temperature-dependent thermal conductivity, and an inverse method based on a real-valued genetic algorithm (GA) optimization. First, the sensitivity coefficients for the transient temperature profiles with respect to the variation of effective thermal conductivity were investigated. Then, several numerical experiments, in which the “experimental data” was numerically generated, were performed to illustrate the robustness and accuracy of the inverse method for retrieving the temperature-dependent effective thermal conductivity from transient temperature history. The experimental data were used to retrieve the effective thermal conductivities of silica aerogel composite, the results fell within 0.014-0.044 W·m−1·K−1 for the temperature between 280 and 1080 K and gas pressure from 0.01 Pa to 100 kPa, and showed nonlinear increasing trend with increasing temperature, and with increasing gas pressure.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Experimental Thermal and Fluid Science - Volume 84, June 2017, Pages 67-77
نویسندگان
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