کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
674373 1459558 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Thermal conductivity of powder silica hollow spheres
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Thermal conductivity of powder silica hollow spheres
چکیده انگلیسی

The thermophysical property of hollow silica spheres was studied by the experimental test 3ω method, theoretical calculation and finite element simulation. The experimental values of the thermal conductivity, less than 0.02 W m−1 K−1, indicated that the powder silica hollow spheres are indeed the high efficient heat-insulating materials. The influences of the particle size and packing density on the thermal conductivity were observed. Then the formula interpreting aerogels were used to calculate the thermal conductivity of hollow silica spheres. The calculated values were larger than the experimental ones. Moreover, ANSYS software was applied to develop a heat conduction model for this type materials based on their hollow structure features. The geometry of the materials was discrete and finite element analysis was performed. The simulated values were close to that of air and a little higher than the experimental and calculated ones. And the possible reasons causing such differences were proposed.

Figure optionsDownload as PowerPoint slideHighlights
► Sub-micrometer silica hollow spheres was selected as the research object.
► Research methods included experimental, calculation and simulation.
► The differences caused by the three different methods were explained reasonably.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 526, Issues 1–2, 10 November 2011, Pages 178–184
نویسندگان
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