مروری بر پوشش‌های مورد استفاده در لوله‌های خنک‌کننده

نوع مقاله : مقاله مروری

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه مواد و متالورژی، دانشکده مهندسی مکانیک و انرژی، دانشگاه شهید بهشتی، تهران، ایران، صندوق پستی: 1719-16765.

2 استادیار، گروه مواد و متالورژی، دانشکده مهندسی مکانیک و انرژی، دانشگاه شهید بهشتی، تهران، ایران، صندوق پستی: 1719-16765.

3 دانشیار، گروه نانوفناوری رنگ، پژوهشگاه رنگ، تهران، ایران، صندوق پستی: 654-16765.

چکیده

پدیده چگالش در بسیاری از کاربردهای صنعتی نظیر شیرین‏سازی آب، وصول آب، تولید انرژی و مدیریت حرارتی وجود دارد. در فرآیندهای تولید انرژی و مدیریت حرارتی پدیده چگالش سبب تغییر در بازده‌ انتقال حرارت فرآیند می‌گردد. پدیده فوق به دو صورت چگالش فیلم آب و چگالش قطره‌ای رخ می‌دهد. یکی از سیستم‏های تبدیل انرژی که در آن پدیده چگالش، بازده سیستم را بشدت تحت تاثیر قرار می‏دهد، لوله‌های خنک‌کننده می‏باشند. در صورتیکه انرژی سطحی لوله خنک‌کننده بالا باشد، فیلم آب بر روی سطح لوله تشکیل گردیده، که این پدیده مانع از انتقال حرارت و در نتیجه اتلاف انرژی و کاهش بازده انتقال حرارت خنک‌کننده می‌شود. جهت رفع این مشکل، لازم است که با کاهش انرژی سطح لوله، چگالش قطره‏ای جایگزین چگالش فیلم گردد. بنابراین، امروزه از پوشش‌های مختلفی جهت کاهش انرژی سطح، افزایش آب‌گریزی و بهبود انتقال حرارت سطح لوله‌های خنک‌کننده استفاده می‌شود. باتوجه به اهمیت پدیده چگالش درلوله‌های خنک‌کننده، در این پژوهش، ابتدا به بیان اهمیت مساله ترشوندگی و مکانیزم انتقال حرارت در لوله‌های خنک‌کننده پرداخته، سپس پوشش‌های مختلف مورد استفاده جهت ایجاد چگالش قطره‌ای آب، کاربردها و پتانسیل‌های بهبود هر یک از این پوشش‌ها با توجه به هزینه، استحکام، دوام و کارایی معرفی می ‏گردد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

An Overview of the Coatings Used in Condenser Tubes

نویسندگان [English]

  • Mohammad Ghorbannejad 1
  • Asal Hosseini Monazzah 2
  • Mehran Rostami 3
1 Department of Materials and Metallurgy, Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, P. O. Box:16765-1719, Tehran, Iran
2 Department of Materials and Metallurgy, Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, P. O. Box:16765-1719, Tehran, Iran.
3 Department of Nano Materials and Nano Coatings, Institute for Color Science & Technology, P. O. Box: 16765-654, Tehran, Iran.
چکیده [English]

Condensation may occur during various industrial applications, including water collection, desalination, energy generation, and thermal management. This phenomenon affects heat transfer efficiency during energy generation and heat management processes. Film-wise and dropwise condensation were the two types of condensation based on their formation manner. Condenser tubes are one of the energy conversion systems in which the condensation phenomenon dramatically affects the system's efficiency. The high surface energy of the condenser tube results in water film formation on the tube surface, which hinders heat transfer. Therefore, the heat transfer efficiency of the condenser is reduced due to further energy loss. The film-wise condensation should be altered to dropwise ones by reducing the surface energy of the tube to eliminate this issue. Hence, different coatings are applied to increase the condenser tubes' hydrophobicity and heat transfer capacity. In this study, the importance of wettability and heat transfer mechanisms in condenser tubes was determined primarily. Afterward, different coatings used to create dropwise condensation were introduced. Eventually, the applications and attributes of the mentioned coatings based on their cost, strength, durability, and efficiency were introduced.

کلیدواژه‌ها [English]

  • Condenser tubes
  • Surface coatings
  • Hydrophobic coating
  • Dropwise condensation
  • Water film-wise condensation
  • Heat transfer

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مطالعات در دنیای رنگ
دوره 12، شماره 2
مهر 1401
صفحه 171-190

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  • تاریخ دریافت: 12 شهریور 1401
  • تاریخ بازنگری: 08 مهر 1401
  • تاریخ پذیرش: 19 مهر 1401

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