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شبیهسازی جریان و انتقال حرارت سیال غیرنیوتنی گذرنده از روی سیلندر دایروی چرخان با روش شبکه بولتزمن | ||
مهندسی مکانیک دانشگاه تبریز | ||
مقاله 24، دوره 48، شماره 2، مرداد 1397، صفحه 209-218 اصل مقاله (2.67 M) | ||
نوع مقاله: مقاله پژوهشی | ||
نویسنده | ||
کیوان فلاح* | ||
استادیار، گروه مهندسی مکانیک، دانشگاه آزاد اسلامی، واحد ساری، مازندران، ایران | ||
چکیده | ||
در مطالعه حاضر انتقال گرما در سیال غیرنیوتنی گذرنده از سیلندر دایروی چرخان با روش شبکه بولتزمن شبیه سازی شده است. رژیم جریان ناپایا دو بعدی در 100 Re=و 20Pr= برای شاخصهای سیال غیرنیوتنی مدل توانی (8/1≤n≤4/0) و سرعت های چرخشی بی بعد (3≤β≤0) بررسی شده است. اثرات سرعت چرخشی بیبعد سیلندر و شاخص توانی بر روی کانتور گردابه، کانتور دما، نوسلت موضعی، نوسلت میانگین سطح و عدد نوسلت میانگین سطح-تناوبی، با جزئیات، مطالعه شده است. نتایج نشان میدهد که با تغییر خواص سیال از نیوتنی به سمت سیال غلیظ شونده برشی کانتور دما کشیدهتر و پهنتر میگردد در حالیکه با تغییرخواص از نیوتنی به رقیق شونده برشی عکس این روند مشاهده میشود. با افزایش نسبت سرعت چرخشی بیبعد، میدان جریان و میدان دما پایا میشوند، که این روند برای سیالات نیوتنی و غیرنیوتنی مشابه میباشد. دیده میشود که با افزایش خواص رقیق شونده برشی و ضخیم شونده برشی در سیالات، آهنگ انتقال گرما ازسطح سیلندر دایروی به ترتیب افزایش و کاهش مییابد. همچنین، نتایج نشان میدهد که با افزایش سرعت چرخشی بیبعد آهنگ انتقال گرما از سطح سیلندر کاهش مییابد. | ||
کلیدواژهها | ||
روش شبکه بولتزمن؛ سیال غیرنیوتنی؛ انتقال گرما؛ سیلندر دایروی چرخان | ||
مراجع | ||
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آمار تعداد مشاهده مقاله: 255 تعداد دریافت فایل اصل مقاله: 497 |