شبیه‌سازی عددی کلکتور خورشیدی سهموی مجهز به مولد گردابه تحت‌تأثیر میدان مغناطیسی حاوی نانوسیال هیبریدی دوفازی Cu-DWCNT/Therminol VP-1

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مکانیک، دانشگاه کاشان، ایران

چکیده

در مطالعۀ حاضر، اثر شکل هندسی مختلف مولدهای گردابه در یک کلکتور خورشیدی سهموی مورد بررسی قرار می‌گیرد. همچنین اثر میدان مغناطیسی در اعداد هارتمن 25 تا 125 بر کلکتور بررسی شده است.‌ نانوسیال هیبریدی دوفازی Cu-DWCNT/Therminol VP-1 به‌عنوان سیال کاری در کسرحجمی صفر، 1 و 4 درصد مورد شبیه‌سازی قرار گرفته است. مطالعه برای رژیم جریان آشفته و در اعداد رینولدز 15000 تا 33000 انجام شد. نانوسیال هیبریدی دوفازی در دمای 23 درجه وارد لوله شده است. همچنین به‌منظور حل جریان آشفته از مدل توربولانسی k-ω-SST و برای حل مشکل کوپلینگ فشار و سرعت از  الگوریتم سیمپل سی استفاده شده است. در کسر حجمی 4 درصد از نانوسیال هیبریدی و عدد رینولدز 33000، افزودن مولد (حالت هندسی Case F) درون کلکتور باعث می‌شود عدد ناسلت متوسط به میزان 83/65 درصد نسبت به زمانی که درون کلکتور بدون مولد گردابه است، افزایش یابد. درنهایت با افزایش عدد هارتمن از 25 تا 125و افزایش عدد رینولدز از 15000 به 33000 موجب افزایش معنی‌دار بازده اگزرژی می‌شود (برای مثال: Case D ≈ 26/6%، Case E ≈ 27/38% ، Case F ≈ 28/92%). این افزایش تا حدود Re ≈ 21000 ادامه داشته و سپس با افزایش بیشتر Re کاهش می‌یابد. در واقع می‌توان نتیجه گرفت که استفاده از میدان مغناطیسی حداکثر بازده اگزرژی را در عدد رینولدز 21000 و عدد هارتمن 120 درون کلکتور مجهز به مولد گردابه با شکل هندسی Case F دارد.

کلیدواژه‌ها

موضوعات


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