همگن سازي و تحليل انتقال حرارت نانوكامپوزيت پلي اتيلن تقويت شده با نانولوله هاي كربني هليكال

Homogenization and heat transfer analysis of coiled carbon nanotube reinforced polyethylene nanocomposite

ﻫﺪف از اﻳﻦ ﭘﮋوﻫﺶ، ﻣﺪلﺳﺎزي ﻫﺪاﻳﺖ ﺣﺮارﺗﻲ ﻛﺎﻣﭙﻮزﻳﺖ ﭘﺎﻳﻪ ﭘﻠﻲاﺗﻴﻠﻦ ﺗﻘﻮﻳﺖ ﺷﺪه ﺑﺎ ﻧﺎﻧﻮﻟﻮﻟﻪﻫﺎي ﻛﺮﺑﻨﻲ ﻫﻠﻴﻜﺎل ﺑﺎ اﺳﺘﻔﺎده از روش اﺟﺰا ﻣﺤﺪود ﻣﻲﺑﺎﺷﺪ. ﻧﺎﻧﻮﻟﻮﻟﻪﻫﺎي ﻛﺮﺑﻨﻲ ﻫﻠﻴﻜﺎل ﺑﻪ ﺷﻜﻞ ﺗﺼﺎدﻓﻲ ﺑﺎ ﺗﻮزﻳﻊ ﻳﻜﻨﻮاﺧﺖ ﺑﺎ ﻧﺴﺒﺖ ﻣﻨﻈﺮي ، درﺻﺪ ﺣﺠﻤﻲ، ﺷﻜﻞﻫﺎ و ﺟﻬﺖﮔﻴﺮيﻫﺎي ﻣﺨﺘﻠﻒ ﺗﻮﺳﻂ ﻛﺪ ﭘﺎﻳﺘﻮن ﺑﺎ اﺳﺘﻔﺎده اﻟﮕﻮرﻳﺘﻢ ﻣﻮﻧﺘﻪﻛﺎرﻟﻮ در آﺑﺎﻛﻮس اﻳﺠﺎد ﺷﺪﻧﺪ. ﻧﺘﺎﻳﺞ ﻧﺸﺎن ﻣﻲدﻫﺪ ﻛﻪ ﺑﺎ اﻓﺰاﻳﺶ درﺻﺪ ﺣﺠﻤﻲ، ﻧﺴﺒﺖ ﻣﻨﻈﺮي و ﺷﻌﺎع ﻧﺎﻧﻮذرات ﻫﻠﻴﻜﺎل، ﻣﻘﺪار ﺿﺮﻳﺐ رﺳﺎﻧﺶ ﺣﺮارﺗﻲ اﻓﺰاﻳﺶ ﻣﻲﻳﺎﺑﺪ ﻛﻪ اﻳﻦ اﻓﺰاﻳﺶ ﺑﺮاي درﺻﺪ ﺣﺠﻤﻲ 0/71 %، ﺑﻪ ﻣﻘﺪار 9/35 % ﺑﻴﺸﺘﺮﻳﻦ ﻋﺎﻣﻞ ﺗﺎﺛﻴﺮﮔﺬار و ﺑﺮاي ﻗﻄﺮ ﻧﺎﻧﻮﻟﻮﻟﻪ ﻛﺮﺑﻨﻲ ﻫﻠﻴﻜﺎل ﺑﺎ ﻣﻘﺪار 1% اﻓﺰاﻳﺶ در ﺿﺮﻳﺐ رﺳﺎﻧﺶ ﺣﺮارﺗﻲ ﻧﺎﻧﻮﻛﺎﻣﭙﻮزﻳﺖ، ﻛﻤﺘﺮﻳﻦ ﺗﺎﺛﻴﺮ را دارد.

Modeling mechanical and thermal properties of nanocomposites is usually carried out via multi scale modeling, where the Finite Element approach is more common in homogeneous. Which can be used with identified properties of the components as a numerical approach. The use of nanoparticles significantly affects the mechanical, thermal, electrical, and mechanical strength properties. Coiled carbon nanotubes, due to their high flexibility, tolerate more strains and have recently attracted the attention of researchers. The purpose of this study is to modeling of the effective thermal conductivity of coiled carbon nanotube reinforced polyethylene nanocomposite through finite element approach. Coiled carbon nanotubes are distributed using the Monte Carlo algorithm in a uniform manner with different aspect ratios, volume fractions, and different geometries of nanoparticles in polyethylene via developing script codes. Using finite element algorithm, thermal analysis is conducted. According to the results, it is shown that increasing the volume fraction, aspect ratio, inner or outer diameter of the Coiled nanoparticles, the thermal conductivity coefficient grows, which for 0.71% volume fraction, the thermal conductivity increases by 9.35% while for the inner or outer diameter of the CCNT, has a minimal effect on the thermal conductivity of the nanocomposite by 1%. By increasing the radius of Coiled carbon nanotube from 15 to 30 nm, the thermal conductivity coefficient decrease by 2.7%.