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مطالعه تجربی چگالش قطره ای بر روی سطوح آبگریز شده با استفاده از فرایند الکترونشست تک مرحله ای | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 2، دوره 52، شماره 6، شهریور 1399، صفحه 1397-1412 اصل مقاله (2.89 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2019.14776.5937 | ||
| نویسندگان | ||
| حمیدرضا طالش بهرامی1؛ علیرضا عزیزی2؛ حمید صفاری* 1 | ||
| 1دانشکده مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران، ایران | ||
| 2دانشجوی کارشناسی ارشد، دانشکده مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران، ایران | ||
| چکیده | ||
| چگالش قطر های بر روی سطوح آ بگریز و ابرآ بگریز اتفاق می افتد. میزان انتقال حرارت چگالش قطر های وابستگی بسیار زیادی به نحوه ی آماد ه سازی سطح آ بگریز دارد. دو مشخصه ی اصلی سطوح آ بگریز وجود میکرو-نانوساختارها و انرژی سطحی پائین آنها است. در این مقاله از روش الکترونشست تک مرحله ای برای ایجاد میکرو-نانو ساختارها بر روی نمونه ی مسی و پوشش تک لایه ی خودچینش یافته ی ۱-اکتادکان تیول به عنوان کاهنده ی انرژی سطحی به منظور استفاده در فرآیند چگالش قطرهای استفاده شده است. بدین منظور اثر پارامترهای مختلف نظیر شد تجریان سلول الکتروشیمیایی و زمان فرآیند الکترونشست بر میزان انتقال حرارت چگالش قطرهای در یک دستگاه چگالش که برای این کار توسعه داده شده، مورد بررسی قرار گرفتند. سطح نمونه ها با عکس میکروسکوپ الکترونی و آنالیز پراش اشعه ایکس تحلیل شدند. نتایج نشان می دهد که میکرو-نانوساختارهایی از جنس مس ضمن فرآیند الکترونشست بر روی سطح به وجود آمده است. از نتایج مشخص شد که زمان و شدت جریان تأثیر مثبتی بر روی انتقال حرارت چگالش قطرهای دارند. به طوری که سطوح تهیه شده با زمان های پائین الکترونشست ) ۱۵ و ۴۵ ثانیه( انتقال حرارت چگالش قطرهای بدتر از چگالش لایه ای و برای زمان های زیاد ) ۱۳۵ ثانیه( الکترونشست انتقال حرارت چگالش قطرهای در محدوده اختلاف دماهای کمتر ۱۰ کلوین در حدود ۲ تا ۴ برابر بیشتر از چگالش لایه ای است. | ||
| کلیدواژهها | ||
| چگالش قطره ای؛ سطوح ابر آبگریز؛ خودچینش یافتگی؛ الکترونشست؛ تغییر فاز | ||
| عنوان مقاله [English] | ||
| An Empirical Study on Dropwise Condensation Occurred on Surfaces Hydrophobized Using a Single-Step Electrodeposition | ||
| نویسندگان [English] | ||
| Hamid Reza Talesh Bahramia1؛ Alireza Azizi2؛ Hamid Saffari1 | ||
| 1School of Mechanical Engineering, Iran University of Science and Technology, Narmak, Tehran, Iran. | ||
| 2School of Mechanical Engineering, Iran University of Science and Technology, Narmak, Tehran, Iran. | ||
| چکیده [English] | ||
| Dropwise condensation occurs on hydrophobic and superhydrophobic surfaces. The rate of heat transfer depends mostly on the preparing process of hydrophobic surface. Two main features of hydrophobic surfaces are existing micro-nanostructures and their low surface energy. In this paper, a one-step electrodeposition process is used to produce the necessary micro-nanostructures on copper surfaces and a self-assembled mono-layer of 1-Octaecanethiol as surface energy reducing agent. Effects of different electrochemical cell parameters such as electrical current and time of process on the dropwise condensation heat transfer are investigated. The heat transfer experiments are performed in a device fabricated for this purpose. The surface of the specimens is analyzed using scanning electron microscopy images and X-ray diffraction analysis. The results show that some microstructures made from copper grow on the surface. The results show that current and process time have positive effects on the dropwise condensation heat transfer. It has been seen that surfaces fabricated at low electrodeposition time (15 and 45 sec) have a worse dropwise heat transfer rate than filmwise condensation heat transfer. On the other hand, higher electrodeposition times (135 sec) give 2-4 times higher heat transfer than filmwise heat transfer in the sub-cooling range lower than 10 Kelvin. | ||
| کلیدواژهها [English] | ||
| Dropwise condensation, Superhydrophobic surfaces, Self-assembly, Electrodeposition, Phase change | ||
| مراجع | ||
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