این سایت در حال حاضر پشتیبانی نمی شود و امکان دارد داده های نشریات بروز نباشند
Journal of Applied Fluid Mechanics، جلد ۱۶، شماره ۵، صفحات ۹۷۳-۹۸۲
عنوان فارسی
چکیده فارسی مقاله
کلیدواژه‌های فارسی مقاله
عنوان انگلیسی Boiling Heat Transfer in Copper Foam Bilayers in Positive and Inverse Gradients of Pore Density
چکیده انگلیسی مقاله Gradient metal foam is an advanced heat transfer material that decreases resistance to bubble escape and enhances the transfer of boiling heat. In this study, boiling heat transfer and bubble behavior were studied in an experimental set-up with copper foam bilayers configurated either in positive or inverse gradients, utilizing deionized water as working fluid. Positive gradient refers to arranging metal foam layers with high pore density at the bottom, above the heat source, and low pore density on the top. Results show that the heat transfer is higher for gradient metal foam surfaces, of 6.14×105 W/m2, versus a uniform metal foam surface, of 3.94×105 W/m2. For the positive gradient configuration, boiling heat transfer performance first increased with the pore density, then decreased when the pore density was higher than 60 pores per inch (PPI). By contrast, for the inverse gradient, the heat transfer performance was nearly constant with increasing pore density. At the low pore density, the inverse gradient performed better than the positive gradient during the whole boiling process. At high pore density, the positive gradient structure performed better in heat transfer at the early boiling stage. Three main types of bubble escape were observed: For the positive gradient bilayer, the bubbles moved up or down without lateral interference. In contrast, for inverse gradient, the bubbles mostly escape from the sides, which is easy to induce bubble merging. The inverse gradient surface generates larger bubbles, while the positive gradient surface produces a higher frequency of bubble detachment. Accordingly, two liquid replenishment models are proposed: for the positive gradient, external liquid replenishes from the side into the copper foam, while for inverse gradient, the liquid is mainly replenished from the top.
کلیدواژه‌های انگلیسی مقاله Gradient copper foam, Liquid replenishment, Bubble behavior, Heat transfer enhancement, Multiphase flow
نویسندگان مقاله H. Wang |
College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China

Q. F. Ying |
College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China

E. Lichtfouse |
Aix Marseille Univ, CNRS, IRD, INRAE, CEREGE, Aix-en-Provence,13007, France

C. G. Huang |
College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China

نشانی اینترنتی https://www.jafmonline.net/article_2194_d33ccaeaf4ff96126b0a09b17bac2e6d.pdf
فایل مقاله فایلی برای مقاله ذخیره نشده است
کد مقاله (doi)
زبان مقاله منتشر شده en
موضوعات مقاله منتشر شده
نوع مقاله منتشر شده
برگشت به: صفحه اول پایگاه   |   نسخه مرتبط   |   نشریه مرتبط   |   فهرست نشریات