Experimental Evaluation of Thermal Conductivity and Other Thermophysical Properties of Nanofluids Based on Functionalized (-OH) Mwcnt Nanoparticles Dispersed in Distilled Water  

作　　者：Alexandre Melo Oliveira Amir Zacarias Mesquita João Gabriel de Oliveira Marques Enio Pedone Bandarra Filho Daniel Artur Pinheiro Palma Alexandre Melo Oliveira;Amir Zacarias Mesquita;João Gabriel de Oliveira Marques;Enio Pedone Bandarra Filho;Daniel Artur Pinheiro Palma(Federal Institute of Sã,o Paulo (IFSP), Sã,o Carlos, Brazil;Nuclear Technology Development Center (CDTN), Belo Horizonte, Brazil;Federal University of Uberlandia (UFU), Uberlandia, Brazil;Brazilian Nuclear Energy Comission, Rio de Janeiro, Brazil)

机构地区：[1]Federal Institute of Sã,o Paulo (IFSP), Sã,o Carlos, Brazil [2]Nuclear Technology Development Center (CDTN), Belo Horizonte, Brazil [3]Federal University of Uberlandia (UFU), Uberlandia, Brazil [4]Brazilian Nuclear Energy Comission, Rio de Janeiro, Brazil

出　　处：《Advances in Nanoparticles》2023年第1期32-52,共21页纳米粒子（英文）

摘　　要：A possible way to increase thermal conductivity of working fluids, while keeping pressure drop at acceptable levels, is through nanofluids. Nanofluids are nano-sized particles dispersed in conventional working fluids. A great number of materials have potential to be used in nanoparticles production and then in nanofluids;one of them is Multi-Walled Carbon Nano Tubes (MWCNT). They have thermal conductivity around 3000 W/mK while other materials used as nanoparticles like CuO have thermal conductivity of 76.5 W/mK. Due to this fact, MWCNT nanoparticles have potential to be used in nanofluids production, aiming to increase heat transfer rate in energy systems. In this context, the main goal of this paper is to evaluate from the synthesis to the experimental measurement of thermal conductivity of nanofluid samples based on functionalized (-OH) MWCNT nanoparticles. They will be analyzed nanoparticles with different functionalization degrees (4% wt, 6% wt, and 9% wt). In addition, it will be quantified other thermophysical properties (dynamic viscosity, specific heat and specific mass) of the synthetized nanofluids. So, the present work can contribute with experimental data that will help researches in the study and development of MWCNT nanofluids. According to the results, the maximum increment obtained in thermal conductivity was 10.65% in relation to the base fluid (water).A possible way to increase thermal conductivity of working fluids, while keeping pressure drop at acceptable levels, is through nanofluids. Nanofluids are nano-sized particles dispersed in conventional working fluids. A great number of materials have potential to be used in nanoparticles production and then in nanofluids;one of them is Multi-Walled Carbon Nano Tubes (MWCNT). They have thermal conductivity around 3000 W/mK while other materials used as nanoparticles like CuO have thermal conductivity of 76.5 W/mK. Due to this fact, MWCNT nanoparticles have potential to be used in nanofluids production, aiming to increase heat transfer rate in energy systems. In this context, the main goal of this paper is to evaluate from the synthesis to the experimental measurement of thermal conductivity of nanofluid samples based on functionalized (-OH) MWCNT nanoparticles. They will be analyzed nanoparticles with different functionalization degrees (4% wt, 6% wt, and 9% wt). In addition, it will be quantified other thermophysical properties (dynamic viscosity, specific heat and specific mass) of the synthetized nanofluids. So, the present work can contribute with experimental data that will help researches in the study and development of MWCNT nanofluids. According to the results, the maximum increment obtained in thermal conductivity was 10.65% in relation to the base fluid (water).

关 键 词：Nanofluids Multi-Walled Carbon Nano Tubes (MWCNT) Functionalization Degree Thermal Conductivity Thermophysical Properties 

分 类 号：TB3[一般工业技术—材料科学与工程]