An experimental investigation on effect of hybrid solid MWCNTs and MgO on thermal conductivity of ethylene glycol

محورهای موضوعی : فصلنامه شبیه سازی و تحلیل تکنولوژی های نوین در مهندسی مکانیک

مسعود وفایی ¹ , مسعود افرند ²

1 - کارشناس ارشد، گروه مهندسی مکانیک، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران.
2 - استادیار، گروه مهندسی مکانیک، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران.

تاریخ دریافت : 1394/11/01 تاریخ پذیرش : 1395/02/18 تاریخ انتشار : 1395/08/01

کلید واژه: Thermal conductivity, Hybrid nanofluid, MgO-MWCNTs, Ethylene glycol, Empirical correlation,

چکیده مقاله :

In recent decade, the new advanced nanofluids, composed from various particles, have attracted the attention of researchers. This class of nanofluids, which can be prepared by suspending several types (two or more than two) of nanoparticles in base fluid, is termed as hybrid nanofluids. In this work, an experimental investigation on the effects of temperature and concentration of nanoparticles on the thermal conductivity of MgO-MWCNT/EG hybrid nanofluid is presented. The experiments performed at temperatures ranging from 25oC to 50oC and solid volume fraction range of 0 to 0.6%. The measurements revealed that the thermal conductivity of nanofluids enhances up to 23.3% with increase in concentration of nanoparticles and temperature. Moreover, efforts were made to provide an accurate correlation for estimating the thermal conductivity at various temperatures and concentrations. Deviation analysis of the thermal conductivity ratio was performed. The comparison between experimental results and correlations outputs showed a maximum deviation margin of 0.95%, which is an acceptable accuracy for an empirical correlation.

چکیده انگلیسی:

  در دهه اخیر نانو سیالات پیشرفته ی جدیدی که از ذرات مختلف تشکیل شده اند مورد توجه محققان قرار گرفته اند. این گونه از نانوسیالات، که به نانوسیالات هیبریدی معروف هستند، عموما از ترکیب دوگونه مختلف نانوذرات ترکیب شده در سیال پایه به دست می آیند. در این مقاله، بررسی آزمایشگاهی اثر نانوذرات جامد هیبریدی نانولوله کربنی و اکسید منیزیم بر ضریب هدایت حرارتی اتیلن گلیکول ارائه شده است. آزمایش‌ها در بازه دمایی 25 تا 50 درجه سانتی گراد برروی نمونه هایی با کسر حجمی 05/0٪، 1/0٪، 15/0٪، 2/0٪، 4/0٪ و 6/0٪ انجام شد. اندازه گیری ها نشان داد که با افزایش مقدار نانوذرات و افزایش دما، ضریب هدایت حرارتی تا 3/23٪ افزایش می یابد. در پایان یک رابطه تجربی جدید به منظور پیش بینی ضریب هدایت حرارتی ارائه شد و تحلیل حاشیه انحراف برای آن پیشنهادی انجام شد. نتایج این تحلیل ها نشان داد که حداکثر حاشیه انحراف 95/0٪ بود که بیانگر دقت قابل قبول رابطه پیشنهادی برای پیش بینی مقادیر ضریب هدایت حرارتی نانو سیال است

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