کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
649716 1457216 2006 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Reduction in emittance of thermal radiator coatings caused by the accumulation of a Martian dust simulant
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Reduction in emittance of thermal radiator coatings caused by the accumulation of a Martian dust simulant
چکیده انگلیسی

Measurements were made of the effective emittance of three types of radiator coatings as a Martian dust simulant was added to the radiator surfaces. The apparatus consisted of multiple radiator coupons on which Carbondale Red Clay dust was deposited. The coupon design employed guard heating to achieve the accuracy required for acceptable emittance calculations. The apparatus was contained in a vacuum chamber that featured a liquid-nitrogen cooled shroud that simulated the Martian sky temperature. Three high-emittance radiator coatings were tested: two while silicate paints, Z-93P and NS-43G, and a silver Teflon film. Radiator temperatures ranged from 250 to 350 K with sky temperatures from 185 to 248 K.As dust was added to the radiator surfaces, the effective emittance of all three coatings decreased from initial values near 0.9 to a value near 0.4. A low-emittance control surface, polished aluminum, demonstrated a rise in effective emittance for thin dust layers, and then a decline as the dust layer thickened. This behavior is attributed to the conductive resistance caused by the dust layer.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Thermal Engineering - Volume 26, Issues 17–18, December 2006, Pages 2383–2392
نویسندگان
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