akbari, M., Saeedi, A. (2015). Experimental Measurement of Dynamic Viscosity of CeO2-EG at Different Concentrations and Temperatures and Proposing a New Correlation. Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 8(2), 89-96.
M. akbari; A.H. Saeedi. "Experimental Measurement of Dynamic Viscosity of CeO2-EG at Different Concentrations and Temperatures and Proposing a New Correlation". Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 8, 2, 2015, 89-96.
akbari, M., Saeedi, A. (2015). 'Experimental Measurement of Dynamic Viscosity of CeO2-EG at Different Concentrations and Temperatures and Proposing a New Correlation', Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 8(2), pp. 89-96.
akbari, M., Saeedi, A. Experimental Measurement of Dynamic Viscosity of CeO2-EG at Different Concentrations and Temperatures and Proposing a New Correlation. Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 2015; 8(2): 89-96.
Experimental Measurement of Dynamic Viscosity of CeO2-EG at Different Concentrations and Temperatures and Proposing a New Correlation
1Assistant Prof., Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad , Iran
2MSc Student, Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Isfahan, Iran.
Abstract
Nanofluid is made through the nanoscale particles suspended in a fluid base and Nanotechnology is a new attempt in thermal science investigations. As a result of huge investment in developed countries on nanotechnology, research on thermal properties of nano-fluids is of particular interest. Due to the usage of nanotechnology to reduce energy consumptions, in this project CeO2 with EG is used to make the nanofluid.For stabilization of nanofluid ultrasonic wave is used and viscosity is measured by a digital viscometer. In this paper, the effects of temperature and volume fraction on the viscosity of nanofluids are considered.This study indicated that the viscosity decreases in all concentrations when temperature increased. Also it increases when the volume fraction of nanoparticles increases. Results show that viscosity changes related to temperature at higher concentrations are higher. After considering the rheological properties and getting accurate test results, it is possible to obtain a relation to predict the nanofluid viscosity based on the temperature and volume fraction with high accuracy
اندازه گیری تجربی لزجت نانوسیال اکسید سریم- اتیلن گلیکول در کسرهای حجمی و دماهای مختلف و ارائه رابطه جدید تجربی
Authors [Persian]
محمد اکبری, امیر حسین سعیدی
Abstract [Persian]
نانوسیالها از طریق معلق ساختن ذرات بسیار ریز در مقیاس نانو در سیال پایه تهیه می شوند و فناوری نانو یکی از تلاش های جدید برای بررسی علوم حرارتی است. در نتیجه سرمایهگذاری عظیم کشورهای پیشرفته روی فناوری نانو، تحقیقات روی خواص حرارتی نانو سیال ها مورد توجه خاصی قرار گرفته است. با توجه به استفاده از فناوری نانو در کاهش اتلاف انرژی، در این پروژه اکسید سریم با اتیلنگلیکول برای تهیه نانوسیال مورد استفاده قرار گرفته شد. به منظور پایدار سازی نانوسیال از فرآیند موج دهی آلتراسونیک و برای اندازهگیری لزجت از لزجت سنج دیجیتال استفاده شد. در این مقاله به بررسی اثر دما و کسر حجمی روی لزجت نانوسیال پرداخته و نتایج این بررسیها نشان می دهد که در تمامی غلظت ها با افزایش دما، لزجت کاهش مییابد. همچنین با افزایش کسر حجمی نانو ذرات، لزجت افزایش مییابد. همانطور که نتایج نشان میدهد تغییرات لزجت با دما در غلظتهای بالاتر شدت بیشتری دارد. پس از بررسی خواص رئولوژیک و بدست آوردن دقیق داده های آزمایشگاهی، رابطهای برای تخمین لزجت نانوسیال با توجه به دما و کسر حجمی بدست می‌آید که از دقت بالایی برخوردار است.
Keywords [Persian]
نانوسیال، لزجت دینامیکی، دی اکسید سریم، اتیلن گلیکول
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