شبیه‌سازی عددی جوشش استخری فیلمی نانوسیالات پایه اتانول

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مکانیک، دانشگاه آزاد اسلامی واحد علوم و تحقیقات، تهران، ایران

چکیده

در این تحقیق، ابتدا فرایند جوشش استخری فیلمی اتانول خالص به‌صورت عددی شبیه‌سازی شده و سپس جوشش استخری فیلمی نانو سیالات شامل دو نوع نانوذره و سیال پایه اتانول با دو غلظت حجمی 1/0% و 3/0% شبیه سازی شده‌اند. نتایج نشان می‌دهند در جوشش فیلمی، حضور نانوذرات در سیال پایه، مقدار ضریب انتقال حرارت جوشش فیلمی را افزایش داده‌است. بیشترین مقدار این ضریب برای نانوسیالات آلومینا و سیلیکا با غلظت حجمی 3/0%، به‌ترتیب 32/0 و 3/0 به‌دست آمده است. علاوه بر ‌این، حضور نانو ذرات در فرایند جوشش، شار حرارتی مینیمم را به‌طور محسوس افزایش داده-است. طبق نتایج شبیه‌سازی عددی، مقدار شار حرارتی مینیمم در جوشش اتانول خالص 99/28، در جوشش نانوسیال آلومینا- اتانول با غلظت های حجمی 1/%0 و 3/0% به‌ترتیب 11/37 و 84/38 و در جوشش نانوسیال سیلیکا - اتانول با غلظت های حجمی 1/0% و 3/0%، به‌ترتیب 81/35 و 31/38 حاصل شده است. با مقایسه مقادیر حاصل و نتایج تجربی، سازگاری خوبی بین نتایج برقرار می‌باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Numerical simulation of film pool boiling of ethanol-based nanofluids

نویسندگان [English]

  • A. Hedayati
  • M. Khayat
  • M.H. Nobakhti
Master of Science, Department of Mechanical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.
چکیده [English]

In recent decades, thermal-fluid specialists have made considerable efforts to investigate the boiling heat transfer process. Pool boiling of pure liquids and nanofluids has been widely studied in the last decade, but the existing knowledge on modeling of nanofluids pool boiling process is still limited. The boiling of fluids containing tinny solid particles is very complicated due to the interaction between the existing phases, their interface, and the heating surface. Some new research shows that many factors are effective in pool boiling of nanofluids. Among these factors, we can mention particle size, concentration, the structure of the boiling surface, and the dynamics of bubbles. In this research, the film pool boiling process of pure ethanol was numerically simulated. Then, the film pool boiling of nanofluids including two types of nanoparticles 〖Al〗_2 O_3 و SiO_2 and ethanol base fluid with two volumetric concentrations of 0.1% and 0.3% have been simulated. The results show that the presence of nanoparticles in film boiling in the base fluid has increased the heat transfer coefficient. The highest value coefficient for alumina and silica nanofluids with a volumetric concentration of 0.3% was obtained, respectively 0.32 (kW/m2°C) and 0.3 (kW/m2°C). In addition, the presence of nanoparticles in the boiling process has significantly increased the minimum heat flux. According to the results of numerical simulation, the minimum heat flux value in boiling of pure ethanol is 28.99 (kW/m2), in boiling of alumina-ethanol nanofluid with volumetric concentrations of 0.1% and 0.3%, is 37.11 (kW/m2) and 38.84 (kW/m2), respectively and in boiling of silica-ethanol nanofluid with volumetric concentrations of 0.1% and 0.3%, is 35.81 (kW/m2) and 38.31 (kW/m2), respectively. The highest heat transfer coefficient is achieved by alumina nanofluid with 0.3% concentration, while the highest minimum heat flux is achieved by silica nanofluid with 0.3% concentration. The numerical results are in good agreement with the experimental results. By comparing these values with the experimental results, there is a good consistency between the results.

کلیدواژه‌ها [English]

  • Film boiling
  • Minimum heat flux
  • Nanofluid
  • Heat transfer coefficient
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