بررسی تجربی انتقال حرارت جابه‌جایی دوغاب مواد تغییر فاز درون لوله‌ای همراه با پره‌های پروانه‌ای

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی نفت، گاز و پتروشیمی، دانشگاه خلیج‌فارس

2 دانشکده مهندسی نفت، گاز و پتروشیمی، دانشگاه خلیج‌فارس، بوشهر

3 هیات علمی دانشکده نفت، گاز و پتروشیمی/ دانشگاه خلیج فارس

4 دانشجو

چکیده

در این مطالعه به بررسی اثر اضافه نمودن مواد تغییر فاز به سیال پایه آب و تولید دوغاب مواد تغییر فاز، پرداخته شد. بدین منظور یک دستگاه آزمایشگاهی آماده شد و مورد استفاده قرار گرفت. بخش اصلی این دستگاه شامل لوله­ای بود که دوغاب مواد تغییر فاز از دورن آن عبور داده می­شود. این لوله با سطح مقطع دایره­ای می­باشد که تحت شار حرارتی ثابتی قرار دارد و مجهز به 6 حسگر دما برای اندازه­گیری دمای دیواره و همچنین 2 عدد حس­گر دما جهت اندازه­گیری دمای سیال ورودی و خروجی می­باشد. علاوه بر اثر افزودن مواد تغییر فاز، اثر قرارگیری پره­های پروان های شکل درون لوله نیز مورد مطالعه قرار گرفت و نتایج به دست آمده از هر دو حالت با یکدیگر مقایسه شدند. نتایج نشان داد که افزودن مواد تغییر فاز به سیال پایه می­تواند میزان انتقال حرارت را به­طور متوسط تا 41 درصد بهبود بخشد. همچنین با قرارگیری پره­های پروانه-ای در مسیر جریان­های آرام، میزان انتقال حرارت تا 234 درصد برای آب خالص و تا 180 درصد برای دوغاب 10 درصد وزنی مواد تغییر فاز افزایش پیدا کرد. دلیل این امر ایجاد اغتشاش در جریان و از بین رفتن لایه­ی مرزی گرمایی می­باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

An Experimental Investigation of Convective Heat Transfer of Slurry Phase Change Material in a Tube with Butterfly Tube Inserts

نویسندگان [English]

  • mostafa moshtagh 1
  • Ahmad Jamekhorshid 2
  • Ahmad Azari 3
  • hassan bazai 4
1 Faculty of Petroleum, Gas and Petrochemical Engineering, Persian Gulf University
2 Faculty of Petroleum, Gas and Petrochemical Engineering, Persian Gulf University, Bushehr
3 Assistant Professor of Chemical Engineering/ Persian Gulf University
4 Faculty of Petroleum, Gas and Petrochemical Engineering, Persian Gulf University
چکیده [English]

In this study, the effect of adding of microencapsulated phase change material to pure water base fluid as a working fluid was investigated. To this end, a laboratory apparatus was prepared and used. The main part of this setup is a tube which is called test section. The test section has a circular cross- section under a constant heat flux and is equipped with 6 thermocouples for measuring wall temperature at 6 different points as well as 2 thermocouples to measure the inlet and outlet flow temperature into the tube. The effect of butterfly tube inserts was also studied and the results were compared with each other. The results indicated that adding phase change material to base fluid could improve the heat transfer rate up to 41%. In addition, when the butterfly blades were placed in the test section, it was observed that the heat transfer rate increased to 234% for pure water and up to 180% for the slurry with 10 wt% of microencapsulated phase change material. The blades increased heat transfer by creating turbulence in the flow and eliminating the thermal boundary layer.

کلیدواژه‌ها [English]

  • Convective Heat Transfer
  • Slurry phase change material
  • Butterfly Tube Inserts
  • Thermal energy storage
  • heat exchanger
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