تحلیل عملکرد یک گیرنده سهموی خورشیدی با نوارهای پیچشی در لوله جاذب (تاثیر تعداد و ضخامت نوار پیچشی)

عابدی نژاد, محمدصادق; تیموری, علیرضا

doi:10.47176/MAJ.2025.1511

تحلیل عملکرد یک گیرنده سهموی خورشیدی با نوارهای پیچشی در لوله جاذب (تاثیر تعداد و ضخامت نوار پیچشی)

نوع مقاله : گرایش پیشرانش و انتقال حرارت

نویسندگان

¹ استادیار،گروه مهندسی مکانیک، دانشکده مهندسی، دانشگاه الزهرا، تهران، ایران

² استادیار،دانشکده مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران، ایران

10.47176/MAJ.2025.1511

چکیده

در این مقاله به بررسی عددی تاثیر تعداد و ضخامت نوار پیچشی در لوله جاذب یک گیرنده سهموی خوشیدی بر مشخصه‌های عملکردی آن پرداخته شده است. شبیه‌سازی گیرنده خورشیدی در شرایط کاملاً توسعه‌یافته جریان سیال و با استفاده از مدل آشفتگی realizable k-ε انجام شده است. پارامترهای هندسی شامل نسبت پیچش (5/0 و 0/1)، ضخامت نوار پیچشی (1، 1.5، 2 میلی متر) و تعداد نوارهای پیچ خورده (1، 2، 3) و عدد رینولدز (شامل 5 سطح) نیز به عنوان پارامتر جریان در نظر گرفته شد‌ه‌اند. با کاهش 100% نسبت پیچش (از 1 به 5/0)، عدد ناسلت به طور میانگین 15% افزایش می‌یابد. در هر حالت مشخص از تعداد و ضخامت نوار پیچشی، با افزایش عدد رینولدز، فاکتور اصطکاک و عدد ناسلت به ترتیب کاهش و افزایش می‌یابند. در اعداد رینولدز بالای 89000، عدد ناسلت با تغییر تعداد نوار پیچشی به میزان تقریبی 35% تغییر می‌کند.کمترین فاکتور اصطکاک در حالت یک نوار پیچشی و بیشترین عدد رینولدز و بیشترین عدد ناسلت در بالاترین عدد رینولدز و در حالت دو نوار پیچشی قابل دستیابی است. افزایش ضخامت نوار پیچشی از 1 به 5/1 میلی‌متر سبب افزایش تقریبی 8% الی 16% در فاکتور اصطکاک، 17% در عدد ناسلت و 74/13 % در فاکتور ازدیاد حرارت می‌گردد. این در حالی است که با افزایش ضخامت از 5/1 به 2 میلی‌متر تاثیر چندانی بر فاکتور اصطکاک، عدد ناسلت و فاکتور ازدیاد حرارت مشاهده نمی‌شود. با افزایش عدد رینولدز تاثیرگذاری ضخامت نوار پیچشی بر ضریب اصطکاک، عدد ناسلت و فاکتور ازدیاد حرارت بیشتر می‌گردد.

چکیده تصویری

کلیدواژه‌ها

موضوعات

پیشرانش و انتقال حرارت

عنوان مقاله [English]

Performance Analysis of a Parabolic Solar Receiver with Twisted Tape in an Absorber Tube (Effect of Number and Thickness of Twisted Tape)

نویسندگان [English]

Mohammad Sadegh Abedinejad ¹
Alireza Teymoori ²

¹ Assistant Professor,Department of Mechanical Engineering, Faculty of Engineering, Alzahra University, Tehran ,Iran

² Assistant Professor, Faculty of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran

چکیده [English]

The effect of the number and thickness of the twisted tapes in the absorber tube of a parabolic trough solar collector on its performance characteristics is numerically investigated. Geometric parameters including the twist ratio (0.5 and 0.1), twist tapes thickness (1, 1.5, 2 mm) and number of twisted tapes (1, 2, 3) and the Reynolds number (including 5 levels) are also considered as flow parameters. With a 100% decrease in twist ratio (from 1 to 0.5), Nusselt number increases by an average of 15%.For any given number and thickness of the tapes, the friction factor and Nusselt number decrease and increase, respectively, with increasing Reynolds number. At Reynolds numbers above 89,000, the Nusselt number changes by approximately 35% with changing the number of tapes. The lowest friction factor is achieved in the case of one tape and the highest Reynolds number, and the highest Nusselt number is achieved in the case of two tapes at the highest Reynolds number. Increasing the thickness of the spiral from 1 to 1.5 mm causes an approximate increase of 8% to 16% in the friction factor, 17% in the Nusselt number, and 13.74% in the heat transfer factor. This is while increasing the thickness from 1.5 to 2 mm does not have much effect on the friction factor, Nusselt number, and heat transfer factor. As Reynolds number increases, the effect of the thickness of the twisted tapes on the friction coefficient, Nusselt number, and heat transfer factor increases.

کلیدواژه‌ها [English]

Parabolic Solar Receiver
Twisted Tape
collector
Number of Twisted Tape
Thickness of Twisted Tape

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