بررسی تجربی اثر pH بر پایداری و ضریب هدایت حرارتی نانوسیالات اکسید فلزی

نوع مقاله : مقاله پژوهشی

نویسنده

گروه مهندسی شیمی، واحد ماهشهر، دانشگاه آزاد اسلامی، ماهشهر، ایران

چکیده

سطح pH نانوسیالات نقش مهمی را در پایداری و ضریب هدایت حرارتی ایفا می‌‌نماید. اما مطالعات محدودی در این زمینه صورت گرفته است. در این پژوهش، بررسی تجربی اثر pH بر پایداری و ضریب هدایت حرارتی نانوسیالات اکسید روی - اتیلن گلایکول در غلظتهای 0/05 و 0/75 درصد حجمی و اکسید منیزیم – آب در غلظتهای 0/05 و 0/5 درصد حجمی انجام شد. اندازه‌گیری‌های تجربی ضریب هدایت حرارتی توسط دستگاه تحلیگر خواص حرارتی در دمای ثابت 25 درجه سانتیگراد انجام گرفت. نتایج نشان داد که میزان pH بر پایداری نانوسیالات به شدت تاثیر گذاشته بطوریکه در pH نقطه ایزوالکتریک، ته‌نشینی و رسوب کامل مشاهده گردید. ضریب هدایت حرارتی نانوسیالات در pH نقطه ایزوالکتریک کمترین مقدار را داشته اما با فاصله گرفتن pH از نقطه ایزوالکتریک، ضریب هدایت حرارتی افزایش یافته است.  بیشترین درصد افزایش ضریب هدایت حرارتی نانوسیال اکسید روی – اتیلن گلایکول برابر با 63% بوده که در غلظت 0/75 درصد حجمی و 12=pH  بدست آمد. اما بیشترین درصد افزایش ضریب هدایت حرارتی نانوسیال اکسید منیزیم-آب برابر با 49% در غلظت 0/5 درصد حجمی و 12= pH حاصل شد. در نهایت با استفاده از نتایج تجربی و با کمک برازش منحنی، معادلاتی با کیفیت مطلوب برای برای پیش بینی ضریب هدایت حرارتی موثر نانوسیالات اکسید فلزی ارائه گردید.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental investigation of the effect of pH on the stability and thermal conductivity of metal oxide nanofluids

نویسنده [English]

  • Behrouz Raei
Department of Chemical Engineering, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran
چکیده [English]

The pH level of nanofluids plays an important role in stability and thermal conductivity. However limited studies have been done in this field. In this research, the effect of pH on the stability and thermal conductivity of ZnO-EG nanofluid at concentrations of 0.05 and 0.75% volumetric fraction and MgO-W at concentrations of 0.05 and 0.5% volumetric fraction were investigated. Experimental measurements of the thermal conductivity were performed by a thermal properties analyzer device at a constant temperature of 25 °C. The results showed that the pH strongly affected the stability of nanofluids so that at the pH of the isoelectric point (IEP), complete aggregation and sedimentation were observed. The thermal conductivity of nanofluids has the lowest value at the pH of the isoelectric point, but as the pH moves away from the isoelectric point, the thermal conductivity  increases. The highest enhancement in the thermal conductivity of ZnO-EG nanofluid was 63%, which was obtained at a volume fraction of 0.75% and pH = 12. However, the highest enhancement in the thermal conductivity of MgO-W nanofluid was 49%, which was obtained at a volume fraction of 0.5% and pH = 12. Finally, using the experimental results and with the help of curve fitting, equations with good quality were presented to predict the effective thermal conductivity of metal oxide nanofluids.

کلیدواژه‌ها [English]

  • Nanofluid
  • stability
  • thermal conductivity
  • experimental

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نشریه مهندسی مکانیک امیرکبیر
دوره 55، شماره 7
مهر 1402
صفحه 857-874

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