بررسی تجربی و آشکارسازی انتقال حرارت جریان جوشش در لوله عمودی حاوی ماده متخلخل فلزی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه صنعتی شاهرود

2 دانشگاه شاهرود

3 Shahrood University of Tech, Shahrood, Iran

4 عضو هیئت علمی گروه مکانیک، دانشگاه شاهرود

چکیده

درمطالعه حاضربه بررسی تجربی انتقال حرارت جوشش در یک لوله عمودی مسی با قطرداخلی16 میلی‌مترتحت شرایط شار‌ حرارتی ثابت و در فشار اتمسفریک با سیال کاری آب پرداخته شده است. تمامی آزمایش‌های دوفازی در محدوده رژیم جریان اسالگ بوده و توسط یک لوله شیشه‌ای که در انتهای بسترآزمایشگاهی قرار داده شده است، با دوربین پرسرعت آشکارسازی گردید. مؤلفه‌های انتقال حرارت نظیرعددناسلتو ضریب انتقال حرارت جابه‌جایی دردبی‌های جرمی و شارهای حرارتی متفاوت اندازه‌گیری گردید و نتایج آزمایش‌ها با روابط تجربی موجود برای حالت دوفازی مقایسه و میزان انحراف نتایج از روابط پیشنهادی گزارش شد. همچنین تاثیرماده متخلخل، شار حرارتیو شار جرمی برمؤلفه‌های انتقال حرارت بررسی گردید.درنهایت مشخص شددرکیفیت‌های پایین، برای لوله حاوی فوم فلزی با افزایش شار حرارتی و جرمی، بهبود ضریب انتقال حرارت نسبت به لوله خالی اندکی کاهش می‌یابد، اما با این‌حال میزان بهبودهموارهدر بازه 5/1 تا 8/1 قرارداردکه نشان‌دهنده بهبودانتقال حرارت درمبدل با فوم فلزی نسبت به مبدل ساده است.همچنین مشخص شدباوجود استفاده از فوم فلزی الگوی جریان همچنان اسالگ باقی می‌ماند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Experimental Investigation and Visualization of Flow Boiling Heat Transfer in a Vertical Tube Containing Metal Porous Medium

نویسندگان [English]

  • Mahdi Kashi 1
  • Amir Ramezani 2
  • Mohsen Nazari 3
  • MM Shahmardan 4
1 Shahrood Univ.
2 Shahrood Univ
4 SUT
چکیده [English]

In this study, flow boiling heat transfer in a vertical copper tube with internal diameter of 16 mm under constant heat flux conditions and at atmospheric pressure is experimentally investigated by using water as working fluid. All two-phase experiments are within the Slug flow regime which are visualized by a glass tube placed at the end of the laboratory bed and a high-speed camera. Heat transfer parameters such as Nusselt number and convection heat transfer coefficients are measured in different mass flow rates and heat fluxes. The results of the experiments are compared with the experimental data for the two-phase flow and the amount of deviation of the results from the proposed relationships is reported. Also, the effects of porous material, heat flux and mass flux on heat transfer parameters are investigated. It was also found that, despite the use of metal foam, the slug flow pattern remains in the porous tube.

کلیدواژه‌ها [English]

  • Two-phase heat transfer
  • flow boiling
  • Metal foam
  • vertical flow
  • visualization
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