Effects of Superhydrophobic, Hydrophobic and Hybrid Surfaces in Condensation Heat Transfer
- سال انتشار: 1400
- محل انتشار: دوماهنامه مکانیک سیالات کاربردی، دوره: 14، شماره: 4
- کد COI اختصاصی: JR_JAFM-14-4_009
- زبان مقاله: انگلیسی
- تعداد مشاهده: 222
نویسندگان
School of Mechanical Engineering, Iran University of Science and Technology, Tehran, ۱۶۸۴۶-۱۳۱۱۴, Iran
School of Mechanical Engineering, Iran University of Science and Technology, Tehran, ۱۶۸۴۶-۱۳۱۱۴, Iran
School of Mechanical Engineering, Iran University of Science and Technology, Tehran, ۱۶۸۴۶-۱۳۱۱۴, Iran
چکیده
The effects of different hydrophobic and superhydrophobic coatings of PDMS, TGIC, SiO۲ and a commercial coating called Danphobix on the condensation heat transfer characteristics of the plates were investigated and compared with the uncoated surface. The initial investigation showed that the values of heat flux and condensation heat transfer coefficient of the plate with Danphobix coating are higher than other coatings. Then, the plates with the commercial coating Danphobix were investigated at five different thicknesses to enhance the condensation heat transfer coefficient. Scanning Electron Microscopy analysis of surface with Danphobix coating showed that the hydrophilic-hydrophobic parts of the generated hybrid surface are formed irregularly in a new intertwined manner. According to the obtained results, decreasing the initial thickness of coating to a definite value, the condensation heat transfer coefficient was augmented. By further decrease, the condensation heat transfer coefficient was reduced due to the elimination of the physical structures of the coating against steam. The highest values of condensation heat transfer coefficient and heat flux of plates with Danphobix coating, that was obtained at the coating thickness of ۱۷ µm comprised ۶۵.۲% of the surface coating by Danphobix. The results indicated that the heat flux and condensation heat transfer coefficient values of the plate with Danphobix coating thickness of ۱۷µm was increased by ۱.۹۷-۲.۱۴ times and ۱.۹۶-۲.۴۶ times compared to the non-coated plate, respectively. In what follows, in addition to the critical thickness, the critical area of the coated surface is also obtained.کلیدواژه ها
Dropwise condensation, Condensation heat transfer coefficient, heat flux, Hybrid hydrophobic, hydrophilic surfaceاطلاعات بیشتر در مورد COI
COI مخفف عبارت CIVILICA Object Identifier به معنی شناسه سیویلیکا برای اسناد است. COI کدی است که مطابق محل انتشار، به مقالات کنفرانسها و ژورنالهای داخل کشور به هنگام نمایه سازی بر روی پایگاه استنادی سیویلیکا اختصاص می یابد.
کد COI به مفهوم کد ملی اسناد نمایه شده در سیویلیکا است و کدی یکتا و ثابت است و به همین دلیل همواره قابلیت استناد و پیگیری دارد.