کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7054578 | 1458020 | 2018 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Minimum heat flux and minimum film-boiling temperature on a completely wettable surface: Effect of the Bond number
ترجمه فارسی عنوان
حداقل شار حرارتی و حداقل دمای جوشش روی یک سطح کاملا قابل تمیز: اثر تعداد باند
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کلمات کلیدی
شماره باند، سطح سوپر هیدروفیله، سطح کاملا قابل تمیز پویایی آزادسازی حباب بخار، جوش فیلم،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
We investigated the effect of Bond number of sphere Bos and surface super-hydrophilicity at minimum film-boiling temperature TMFB and minimum heat flux qâ³min using quenching experiment at atmospheric pressure and the saturation temperature of water. In particular, we focused on the vapor-releasing dynamics in film boiling and evaluated the main parameters such as vapor-bubble releasing frequency fb and vapor-bubble departure diameter Db. We selected two sizes of quench sphere (sphere diameter Dsâ¯=â¯15â¯mm and 25â¯mm) based on critical Bond number BoC to evaluate the vapor-releasing dynamics depending on the Bos. The super-hydrophilic surface was prepared by the anodic oxidation on zirconium (Zr-702) sphere. High speed visualization and inverse heat transfer calculation facilitate a qualitative and quantitative analysis of film boiling heat transfer. The surface super-hydrophilicity of the quench sphere increases TMFB and qâ³min: 12% and 366% increase for Dsâ¯=â¯15â¯mm and 20% and 305% increase for Dsâ¯=â¯25â¯mm, respectively. Db strongly depends on Ds and exhibits a relatively weak dependency to the surface super-hydrophilicity. fb is affected by the Ds and the surface super-hydrophilicity. The increase in TMFB is explained by the liquid-solid contact in film boiling. The D25-CWS exhibits the large area fraction of liquid-solid contact versus total heat transfer surface compared to the D15-CWS. The increase in qâ³min is related to minimum frequency of vapor-bubble releasing to sustain the stable liquid-vapor interface fb,min because the large fb,min indicates the fast destabilization of the liquid-vapor interface in film boiling during quenching.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 120, May 2018, Pages 399-410
Journal: International Journal of Heat and Mass Transfer - Volume 120, May 2018, Pages 399-410
نویسندگان
Jun-young Kang, Tong Kyun Kim, Gi Cheol Lee, Hyun Sun Park, Moo Hwan Kim,