بررسی عددی ذوب شدن مواد تغییر فاز دهنده نانو درون محفظه‌ی مثلثی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 تبدیل انرژی, مکانیک, صنعتی نوشیروانی بابل, بابل, ایران

2 گروه حرارت و سیالات، دانشکده مهندسی مکانیک، دانشگاه صنعتی نوشیروانی بابل، بابل

چکیده

در این مقاله به بررسی عددی رفتار ذوب مواد تغییر فاز دهنده در یک مبدل حرارتی دو لوله‌ای دوبعدی پرداخته شده است. فضای داخلی بین پوسته و لوله با استفاده ازانِ-ایکوسین و ذرات مس به ترتیب به عنوان مواد تغییر فاز دهنده و نانوذرات پر شده است و آب به عنوان سیال گرم در لوله داخلی جریان دارد. برای بررسی اثر نانوذرات در سرعت انتقال حرارت، ذرات مختلفی از نانوذرات مس به مواد تغییر فاز دهنده پایه افزوده شده است. همچنین اثر آنتروپی مورد بررسی قرار گرفته است. نتایج شبیه‌سازی نشان می‌دهد که نانوذرات باعث افزایش هدایت حرارتی مواد تغییر فاز دهنده نانو نسبت به مواد تغییر فاز دهنده معمولی می‌شود. زمان ذوب مواد تغییر فاز دهنده با افزایش دما از 40 به 45 و 55 درجه سانتی‌گراد باعث کاهش زمان ذوب تا 53 و 76 درصد می‌گردد. همچنین افزایش نانوذره با کسر حجمی 04 / 0 به مواد تغییر فاز دهنده در این سه دما باعث کاهش زمان ذوب تا 20 درصد می‌گردد. افزایش هدایت حرارتی مؤثر در کاهش تولید آنتروپی سیستم، بسیار بیشتر از کاهش گرمای ویژه و حرارت نهان نانو مواد تغییر فاز دهنده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Numerical Investigation of Melting Nano-Enhanced Phase Change Materials in Triangular Enclosure

نویسندگان [English]

  • abolfazl nematpour 1
  • mohsen sheikholeslami 2
1 Masters student, Department of Mechanical Engineering, Noshirvani Babol, Babol, Iran
2 Department of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Islamic Republic of Iran
چکیده [English]

This paper presents a numerical study of the melting of nano-enhanced phase change materials inside a triangular container using N-eicosane and copper particles as base material and nanoparticle, respectively. Nanoparticles are used in the process of heat transfer and improve lubrication performance. To investigate the effect of nanoparticles on the heat transfer rate, various particles of copper nanoparticles have been added to the base phase change materials. The increase in the performance of the heat transfer of nanoparticles in the solid state was more than the liquid state in the laminar flow and the natural convection heat transfer. Also, the effect of entropy has been investigated. The simulation results show that the nanoparticles cause an increase in the thermal conductivity of nano-enhanced phase change materials compared to conventional phase change material. Increasing thermal conductivity by reducing the latent heat, increases the rate of melting of nanoparticles. The time of the melting of the phase change material has significantly decreased with increasing nanoparticles. Increasing the thermal conductivity effective in reducing the entropy production of the system is much more than the reduction of the specific heat and the heat of fusion of nano-enhanced phase change materials.

کلیدواژه‌ها [English]

  • Nano-enhanced Material
  • Phase change material
  • nanoparticles
  • Entropy
  • Melting
  • Natural convection
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