بررسی تجربی ضریب انتقال حرارت جابجایی و عدد ناسلت، در نانوسیال آب/کربن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی مکانیک، دانشکده مهندسی مکانیک، دانشگاه صنعتی جندی شاپور، دزفول، ایران

2 گروه مهندسی شیمی، دانشکده مهندسی شیمی، دانشگاه صنعتی جندی شاپور، دزفول، ایـران

3 گروه مهندسی مکانیک، دانشکده مهندسی مکانیـک، دانشگاه صنعتی جندی شاپور دزفـول، ایــران

4 گروه مهندسی مکانیک، دانشکده مهندسی مکانیک، دانشگاه صنعتی جندی شاپور دزفول، دزفول، ایران

چکیده

یکی از مهمترین عوامل تاثیرگذار برعملکرد یک سیال در فرایند انتقال حرارت، ضریب انتقال حرارت سیال می‌باشد. با توجه به بالاتر بودن ضریب انتقال حرارت رسانشی فلزات نسبت به مایعات، می‌توان با استفاده از ذرات جامد فلزی، میزان انتقال حرارت را افزایش داد. یکی از روش‌های جدید برای افزایش انتقال حرارت در مبدل‌های حرارتی، استفاده از نانوسیالات می‌باشد. در این مقاله پارامترهای اصلیِ تأثیر گذار بر افزایش ضریب انتقال حرارت جابجایی نانو سیال کربن نسبت به سیال پایه آب، ازجمله دبی و غلظت نانو سیال را در محدوده رینولدز 7100 تا 16700 که حالت جریان آشفته درون لوله محسوب می‌شود، بررسی شده است. نتایج به دست آمده نشان داد که افزایـش رینولدز منجر به افزایش ناسلت و ضریب انتقال حرارت جابجایی و کاهـش ضریـب اصطـکاک می‌شود. همچنین نشان داده شد که در یک رینـولدز ثـابت، نانـو سیـال کربن توانسته است تـا 17/10 % ضریب انتقال حرارت جابجایی بیشتری نسبت به سیال پایـه (آب) داشته باشد. مشخص شد که با افزودن نانوذرات به آب، در ابتدا شاهد افزایش در ضریب انتقال حرارت جابجایی نانوسیال هستیم. این افزایش تا غلظت حدود 2/0 درصد جرمی از نانوکربن ادامه داشته و پس از آن ضریب انتقال حرارت جابجایی، روندی کاهشی پیدا می‌کند. بعـلاوه در ایـن پـژوهش، افت فشار ناشی از تغییرات رینولدز نیز بررسی شد و مشخص شد که رفتار این منحنی با دیاگرام مودی کاملاً در تطابق است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

An Experimental Investigation on the Convective Heat Transfer Coefficient and Nusselt Number in Water/Carbon Nanofluid

نویسندگان [English]

  • Amir Hossein Shiravi 1
  • Mojtaba Shafiee 2
  • Hadis Bostani 3
  • Mohammad Firoozzadeh 4
  • Maryam Bozorgmehrian 3
1 Department of Mechanical Engineering, Faculty of Mechanical engineering, Jundi-Shapur University of technology, Dezful, Iran
2 Department of Chemical Engineering, Faculty of Chemical Engineering, Jundi-Shapur University of Technology, Dezful, Iran
3 Department of Mechanical Engineering, Jundi-Shapur University of Technology, Dezful, Iran
4 Department of Mechanical Engineering, Faculty of Mechanical Engineering, Jundi-Shapur University of technology, Dezful, Iran
چکیده [English]

The heat transfer coefficient of fluid is one of the most important effective factors on the performance of fluid in the heat transfer process. Due to the higher conductive heat transfer coefficient of metals than liquids, metal particles can be used to increase the heat transfer rate of liquids. Nanofluid is one of the novels and developing methods to improve the heat transfer rate in heat exchangers. In this paper, the main effective parameters (flow rate and concentration) on increasing the convective heat transfer coefficient of water carbon nanofluid compared with water as a base fluid, are investigated in the Reynolds range of 7,100 to 16,700. The results illustrate that increasing the Re leads to increase in the Nusselt number and convective heat transfer coefficient, and also to decrease the friction factor. It is also shown that at a constant Re, carbon nanofluid is able to enhance the convective heat transfer coefficient up to 10.17%, compared with pure water. It is found that adding carbon nanoparticles to water, initially leads to increasing the convective heat transfer coefficient, while this trend continues until the concentration of about 0.2 wt%, and then has a descending trend. In addition, the pressure drop was investigated due to changes in Re and was shown that the behavior of this curve is in agreement with Moody’s diagram.

کلیدواژه‌ها [English]

  • Nanofluid
  • heat transfer
  • Nusselt number
  • Friction factor
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