کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7055117 | 1458040 | 2016 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Measurement and simplified numerical prediction of effective thermal conductivity of open-cell ceramic foams at high temperature
ترجمه فارسی عنوان
اندازه گیری و پیش بینی عددی ساده هدایت حرارتی مؤثر فوم های سرامیکی باز سلولی در دمای بالا
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
In the present article, the effective thermal conductivity (ETC) of 10 ppi open-cell ceramic foams is measured at temperatures ranging from 22 °C to 750 °C using the transient plane source (TPS) technique. The detailed morphology of the foam structures is reconstructed from 3D CT-scan images and their structural analysis is carried out using a volume image processing tool. The experimental results are compared with the predictions of directional ETC, obtained using a simplified 1D homogeneous model that considers coupled conduction-radiation heat transfer. The parameters, required by the model, are evaluated based only upon the information that could be extracted from 3D CT-scan images under certain simplifying assumptions. It can be concluded that the predictions of ETC for the present ceramic foam samples clearly correlate with the geometric parameters obtained from their structural analysis. It is also observed that the estimated microscopic porosity of the foam, which is not captured by 3D CT-scan images, has considerable influence on the reconstructed foam structure and hence on the predicted ETC. The predictions of ETC in the measured direction, obtained after the proposed directional averaging, compare extremely well with TPS measurements for the complete range of investigated temperatures. This suggests that the measurements of ETC, obtained employing TPS technique, are the directionally averaged representations of ETC in three perpendicular directions. The present investigation also clearly demonstrates the potential of the simplified modeling approach for characterizing even the directional ETC of open-cell ceramic foams, based primarily on their structural information.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 102, November 2016, Pages 396-406
Journal: International Journal of Heat and Mass Transfer - Volume 102, November 2016, Pages 396-406
نویسندگان
Miguel A.A. Mendes, Pitt Goetze, Prabal Talukdar, Eric Werzner, Cornelius Demuth, Philip Rössger, Rhena Wulf, Ulrich Gross, Dimosthenis Trimis, Subhashis Ray,