نشریه علمی فرآیند نو

نشریه علمی فرآیند نو

مروری بر پوشش‌های انتقال حرارت بالا در کندانسورهای نیروگاه بخار

نوع مقاله : مروری

نویسندگان
1 استادیار، عضو هیئت‌علمی، گروه پژوهشی مواد غیرفلزی، پژوهشگاه نیرو، تهران
2 دانشجوی دکتری تخصصی، دانشکده شیمی/دانشگاه کاشان، کاشان
چکیده
چگالش در اکثر فرآیندهای انتقال حرارت، از خنک کردن وسایل الکترونیکی تا دفع گرما در نیروگاه‏ها، رخ می‏دهد. ضریب انتقال حرارت کلی چگالش قطره‌ای (DWC) در مقایسه با چگالش لایه‌ای (FWC)، چندین برابر بیشتر است؛ بنابراین، به دست آوردن DWC پایدار برای عملکرد بهتر بسیار مهم است. پایداری DWC به آب‌گریزی سطح، انرژی آزاد سطح و کشش سطحی مایع چگالشی بستگی دارد. خواص مورد نیاز برای DWC ممکن است با اصلاح سطح در مقیاس میکرو به دست آید. در این بررسی، پوشش‌های میکرو/ نانومقیاس مانند فلزات نجیب، کاشت یون، اکسیدهای خاکی کمیاب، سطوح تزریق‌شده با روان‌کننده، پلیمرها، سطوح نانوساختار، نانولوله‌های کربنی، گرافن و پوشش‌های متخلخل بررسی و مورد بحث قرار گرفته‌اند. روش‌های پوشش سطحی، کاربردها و پتانسیل آن با توجه به توانایی انتقال حرارت، دوام و کارایی مقایسه شده‌اند. علاوه بر این، محدودیت‌ها و چالش‌های رایج برای کاربردهای افزایش چگالش برای ارائه دستورالعمل‌های تحقیقاتی آتی تجمیع شده‌اند.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

A Review of High Heat Transfer Coatings in Steam Power Plant Condensers

نویسندگان English

Majid Mirzaee 1
Tayyebeh Mohebbi 2
1 Assistant professor, Non-metallic Materials Research Group, Niroo Research Institute, Tehran
2 Ph.D Student, Chemistry Department, Kashan university, Kashan
چکیده English

Condensation occurs in most heat transfer processes, from cooling electronic devices to heat removal in power plants. The overall heat transfer coefficient of dropwise condensation (DWC) is several times higher than that of filmwise condensation (FWC). Therefore, obtaining a stable DWC is very important for better performance. DWC stability depends on surface hydrophobicity, surface free energy, and surface tension of the condensed liquid. The properties required for DWC may be achieved by micro-scale surface modification. In this review, micro/nanoscale coatings such as noble metals, ion implantation, rare earth oxides, lubricant-injected surfaces, polymers, nanostructured surfaces, carbon nanotubes, graphene, and porous coatings have been reviewed and discussed. Surface coating methods, applications, and potential have been compared with respect to heat transfer ability, durability, and efficiency. In addition, common limitations and challenges for densification enhancement applications are summarized to provide future research directions.

کلیدواژه‌ها English

Filmwise Condensation
Dropwise Condensation
Surface Coatings
Heat Transfer
Surface Energy
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