مقاله پژوهشی: سنتز و بررسی تجربی اثر نسبت حجمی و دما بر ضریب هدایت حرارتی نانوسیال اکسید مس‌ـ‌آب

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد. گروه فیزیک،دانشکده فیزیک،دانشگاه پیام نور،تهران،ایران

2 استادیار، دانشگاه پیام نور، اهواز، ایران

3 استادیار دانشگاه پیام نور اهواز

چکیده

در این مقاله اثر نسبت حجمی نانوذرات و دما بر ضریب هدایت حرارتی نانوسیال اکسید مس به صورت تجربی بررسی شد. بدین منظور، نانوذرات اکسید مس پس از تهیه، توسط آنالیزهایXRD  و  EDXو  SEMمشخصه­یابی شدند. آنالیز XRD فاز نمونه و آنالیز EDXحضور عناصر مس و اکسیژن و SEM ابعاد نانومتری نمونۀ سنتزشده را تأیید کرد. نانوذرات اکسید مس با ابعاد ۵۰ نانومتر پس از تهیه، جهت سنتز نانوسیال اکسید مس استفاده شدند. نمونه‌های  نانوسیال اکسید مس به روش دومرحله­ای و با استفاده از آب مقطر به عنوان سیال پایه در نسبت­های حجمی مختلف (۱٪ ، ۲٪، ۳٪) سنتز شدند. سپس در اولتراسونیک به مدت ۳۰ دقیقه مخلوط شدند و نانوذرات به صورت همگن درون سیال پایه به حالت تعلیق در آمدند. سپس، pH تمامی نمونه‌ها اندازه­گیری و کنترل شد. همچنین ضریب هدایت حرارتی نمونه­های نانوسیال سنتزشده در محدودۀ دمایی ۲۳ـ۵۱ درجۀ سلسیوس اندازه‌گیری شد. نتایج نشان داد که با افزایش دما و نسبت حجمی نانوذرات اکسید مس درون آب مقطر، در همۀ نمونه­ها ضریب هدایت حرارتی افزایش یافت. نمونۀ دارای نسبت حجمی ۳٪ بالاترین ضریب هدایت حرارتی و نقطۀ بهینه را در بین غلظت­های موجود دارد، زیرا علاوه بر ضریب هدایت حرارتی خوب، pH خنثی نیز دارد. در ادامه، نتایج تجربی هدایت حرارتی نانوسیال اکسید مس‌ـ‌آب با مقادیر به‌دست‌آمده از مدل­های نظری مقایسه شد.
 

کلیدواژه‌ها


عنوان مقاله [English]

Synthesis and Experimental Study of the Effect of Volume Fraction and Temperature on Thermal Conductivity Coefficient of Copper Oxide-Water Nanofluid

نویسندگان [English]

  • Maryam Moridpour 1
  • Alireza Razeghizadeh 2
  • Vahdat Rafee 3
1 Department of Physics, Faculty of physics, Payame noor University, Tehran, Iran
2 Department of Physics, Payame Noor University of Ahvaz, Iran
3 payam nour university, ahwaz, Iran
چکیده [English]

The effect of volume fraction and temperature on the thermal conductivity coefficient of nanofluid copper oxide was investigated. The synthesized copper oxide nanoparticles were characterized by XRD, EDX and SEM. XRD analysis of the samples established the phase, EDX analysis provided the presence of copper and oxygen elements and SEM analysis confirmed their nanometer sizes. Copper oxide nanoparticles with dimensions of 50nm were used to synthesize copper oxide nanofluids. Copper oxide nanofluid were synthesized by two step method using distilled water as a base fluid in various volume fractions (%1, %2, %3). Then, they were mixed in ultrasonic for 30min and the nanoparticles were suspended homogeneously in the base fluid. In this regard, the pH of all samples was measured and controlled. Also, the thermal conductivity coefficient of the synthesized nanofluid samples were measured at temperature range . The results of the research showed that with increasing temperature and volume fraction of copper oxide nanoparticles in distilled water, the thermal conductivity coefficient in all samples increased. A sample with concentration of %3 had the higher thermal conductivity coefficient and optimum point in the concentrations, because in addition to the high thermal conductivity, it had a neutral pH. Finally, the experimental results of thermal conductivity of copper oxide nanofluids were compared to the obtained values from theoretical models.

کلیدواژه‌ها [English]

  • Volume Fraction
  • Nanoparticle
  • Nanofluid
  • Copper Oxide
  • Thermal Conductivity Coefficient
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