بررسی عددی و تحلیلی اثرات تفرق حرارتی بر انتقال حرارت جریان نانوسیال درون یک کانال

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه بوعلی سینا همدان

2 بوعلی سینا همدان

چکیده

در مطالعۀ حاضر انتقال حرارت جریان نانوسیال از داخل یک کانال با آرایش‌های مختلفی از تزریق نانوذرات به‬عنوان عناصر تفرق حرارتی، بررسی شده‌است. در پدیدۀ انتقال حرارت حضور نانوذرات در جریان سیال به‬عنوان یکی از مهم‌ترین عوامل ایجاد تفرق یا پراکندگی حرارتی شناخته می‬شود. در این پژوهش نحوۀ توزیع عناصر تفرق حرارتی یا همان نانوذرات در کانال به سه صورت توزیع در منطقۀ مرکزی، توزیع در منطقۀ نزدیکی دیوار و توزیع در کل کانال درنظر گرفته شده‌است. اعتبارسنجی نتایج توسط راه‌حل تحلیلی برای یک وضعیت سادۀ مسئله و همچنین مقایسه با نتایج ارائه‌شده در مقالات گذشته، انجام شده‌است. حضور نانوذرات در منطقۀ مرکزی کانال، عدد ناسلت و ویژگی‌های انتقال حرارت را به‌شکل صعودی افزایش می‌دهد؛ اما برای آرایش مرزی، افزایش ضخامت نانوذرات تزریق‌شده منجر به یک رفتار صعودی- نزولی برای عدد ناسلت می‌شود، بنابراین در این توزیع، ضخامت بهینه‌ای برای عناصر تفرق به‌دست می‌آید. همچنین در بررسی توابع توزیع مختلف نانوذرات تزریق‌شده در کل کانال، مشاهده می‌شود که برخلاف توزیع سهموی که منجر به افزایش تقریباً خطی عدد ناسلت می‌شود، در توزیع نمایی و به‌خصوص به‌ازای مقادیر بزرگ‌تر ضریب تفرق، افزایش عدد ناسلت رفتاری غیرخطی دارد که مهم‌ترین وجه تمایز این دو تابع توزیع می‌باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Numerical and Analytical Investigation of Thermal Dispersion Effects on the Heat Transfer of Nanofluid flow inside a Channel

نویسندگان [English]

  • Habib-Olah Sayehvand 1
  • Amir Basiri Parsa 2
1 BuAli-Sina University
2 BuAli-Sina University
چکیده [English]

In the present study the heat transfer of nanofluid flow inside a channel with different arrangements of nanoparticles injection (dispersive elements) is investigated. In the heat transfer phenomena, nanoparticles presence in the fluid flow is known as one of the most important factor for the thermal dispersion. In this work, the distribution of dispersive elements or nanoparticles in the channel is considered to be uniformly distributed in the central region and near the walls. The validation of results is verified by the analytical solution for a simple state of the problem and also by comparison with previous published papers. The presence of the nanoparticels in the center region, increase the Nusselt number and heat transfer characteristics with an ascending form. For the boundary arrangement, increasing the thickness of injected nanoparticles lead to an ascending-descending behavior for Nusselt number. Therefore in this distribution, the optimum thickness for dispersive elements is obtained. Also it can be seen that the presence of the nanoparticels with parabolic distribution increase the Nusselt number with a univocal form. For the exponential arrangement, especially for large values of dispersive coefficient, increasing the Nusselt number has a nonlinear behavior that is the most important distinction of these two distribution functions.

کلیدواژه‌ها [English]

  • Channel
  • Heat transfer
  • Nanofluids
  • Thermal dispersion

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