بررسی مطالعات آزمایشگاهی و تئوری بهبود ضریب رسانش گرمایی نانوسیالات

نوع مقاله : مقاله ترویجی

نویسندگان
مسعود بهرامی
سمیه علی دوست
گروه مهندسی گاز، دانشکده نفت اهواز، دانشگاه صنعت نفت، اهواز، صندوق پستی ۶۳۴۳۱
چکیده
سیالات انتقال حرارتی مرسوم، مانند آب، روغن و اتیلن گلیکول که در صنایع مختلفی مانند فرآیندهای شیمیایی، تبرید، فرآیندهای سرد و گرم کردن، حمل‌و‌نقل، نیروگاه­ها و صنایع با اندازه‌ای در حد میکرومتر که خصوصیات انتقال حرارتی ضعیفی دارند، استفاده می­شوند. افزایش ضریب رسانش گرمایی ایده­ی کلیدی برای بهبود ویژگی­های انتقال حرارتی سیالات مرسوم است. از آنجایی‌که ذرات جامد دارای ضریب رسانش گرمایی بیشتری نسبت به سیال پایه هستند، انتظار می­رود که معلق­سازی ذرات ریز جامد در سیال پایه، باعث بهبود ضریب رسانش گرمایی شود. سوسپانسیون رقیق حاوی ذرات نانومتری را نانوسیال می­گویند که این دسته از سیالات خواص انتقال حرارتی را افزایش داده­اند و به نظر می­رسند که گزینه امیدبخشی برای سیستم­های گرمایی نسل بعدی باشند. به‌همین منظور پارامترهای مختلفی که بر روی ضریب رسانش گرمایی نانوسیالات اثر می­گذارند بررسی شده است و حتی مدل­های مختلفی هم برای پیش‌بینی ضریب رسانش گرمایی آن­ها ارائه شده است اما هنوز مدل واحدی که بتواند همه­ی مکانیزم­های احتمالی انتقال حرارت را برای نانوسیالات درنظر بگیرد وجود ندارد.

کلیدواژه‌ها

موضوعات

عنوان مقاله English

A Review on Theoretical and Experimental Studies on Improving the Thermal Conductivity Coefficient of Nanofluids

نویسندگان English

Masoud Bahrami
Somayeh Alidoust
Department of Gas Engineering, Petroleum University of Technology(RIPI), P.O. Box 63431, Ahvaz, Iran
چکیده English

Conventional heat transfer fluids, such as water, oil and ethylene glycol, are used in a variety of industries, such as chemical processes, refrigeration, cooling and heating processes, transportation, power plants and micro-sized industries with a low-heat transfer characteristic. Increasing the coefficient of thermal conductivity is the key idea to improving the heat transfer properties of conventional fluids. Solid particles have higher thermal conductivity than the base fluid, as a consequence it is expected that the heat transfer coefficient could be increased by suspending solid particles in the base fluid. Nanofluids, which are diluted suspensions containing nano-particles, seem to be a hopeful option for next generation of thermal systems. However there are several researches reported the various parameters affecting heat transfer coefficient of nanofluids.  In spite of several models have been proposed to predict their thermal conductivity coefficient, still a unique model that can predict all possible heat transfer mechanisms of nanoparticles is lacking.

کلیدواژه‌ها English

Nanofluids
Thermal conductivity coefficient
Heat transfer
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  • تاریخ دریافت 03 اردیبهشت 1401