شبیه‌سازی جریان و انتقال حرارت سیال غیرنیوتنی گذرنده از روی سیلندر دایروی چرخان با روش شبکه بولتزمن

نوع مقاله : مقاله پژوهشی

نویسنده

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.

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