Journal of Interfaces, Thin Films, and Low dimensional systems
Experimental investigation of the thermal conductivity of hybrid nanofluids using Ag/ MWCNT nanocomposite particles
Document Type : Original Article
Authors
1 Department of Engineering Sciences and Physics, Buein Zahra Technical University, Buein Zahra 3451866391, Iran.
2 Research and Development department, Nano Gostar Kimiagaran Arvand knowledge based company, Mashhad, Khorasan, Iran.
3 Department of Chemistry, Faculty of Science, Ilam University 69315-516, Iran.
Abstract
he presence of nanoparticles enhances heat transfer in heat exchangers. The degree of enhancement depends on the type, size, and shape of nanoparticles, as well as temperature conditions. Therefore, this study aims to improve thermal conductivity in a hybrid nanofluid by incorporating a nanocomposite. Due to their high thermal conductivity, spherical-shaped silver nanoparticles are suitable for synthesizing composites with cylindrical-shaped functionalized multi-wall carbon nanotubes. The characteristics of the synthesized nanocomposite were investigated via UV-Vis spectrophotometer, SEM, and TEM analyses. Also, the effects of Ag concentrations and temperature on thermal conductivity were investigated. The thermal conductivity can be enhanced by 15%, increasing Ag concentration from 0.05-0.5 wt.% and temperature in the 20-45 C range. The stability of the synthesized MWCNT/Ag nanofluid was evaluated after more than 90 days. The results indicated that the nanofluids with lower concentrations of Ag nanoparticles preserved their stability without using a surfactant.
Keywords
Main Subjects
Article Title [Persian]
رسانندگی حرارتی نانوسیالات هیبریدی با استفاده از نانو ذرات نقره و نانو لوله های کربنی چند دیواره
Authors [Persian]
- سارا حشمتیان 1
- هومن بخشی 2
- توان کیخاونی 3
1 گروه فیزیک و علوم مهندسی، دانشگاه صنعتی بوئین زهرا، بوئین زهرا ۳۴۵۱۸۶۶۳۹۱، ایران.
2 گروه تحقیق و توسعه، شرکت نانو گستر کیمیاگران آروند، خراسان، ایران.
3 گروه شیمی، دانشکده علوم، دانشگاه ایلام ۵۱۶-۶۹۳۱۵، ایران.
Abstract [Persian]
وجود نانوذرات باعث افزایش انتقال حرارت در مبدل های حرارتی می شود. میزان افزایش انتقال حرارت به نوع، اندازه و شکل نانوذرات و همچنین شرایط دمایی بستگی دارد. بنابراین، در این مطالعه، بهبود هدایت حرارتی در یک نانوسیال هیبریدی با استفاده از ترکیب یک نانوکامپوزیت انجام می‌شود. نانوذرات نقره کروی به دلیل رسانایی حرارتی بالا گزینه مناسبی برای سنتز کامپوزیت با نانولوله کربنی چند جداره استوانه ای شکل هستند. ویژگی‌های نانوکامپوزیت سنتز شده از طریق اسپکتروفتومتر UV-Vis، SEM و آنالیز TEM مورد بررسی قرار گرفت. همچنین اثرات غلظت نقره و دما بر هدایت حرارتی مورد بررسی قرار گرفت. هدایت حرارتی را می توان با افزایش غلظت نقره از 0.05-0.5 درصد وزنی و دما در محدوده 20-45 درجه سانتیگراد 15٪ افزایش داد. پایداری نانوسیال MWCNT/Ag سنتز شده پس از بیش از 90 روز مورد ارزیابی قرار گرفت. نتایج نشان داد که نانوسیالات با غلظت های پایین تر نانوذرات نقره، پایداری خود را بدون استفاده از سورفکتانت حفظ کردند.
Keywords [Persian]
- نانوسیالات هیبریدی
- ذرات نانوکامپوزیت
- نانولوله کربنی چند دیواره
- هدایت حرارتی
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