Abstract
This article presents a model of thermal conductivity of nanofluids based on dimensionless-group methods. In addition to the thermal conductivity of base fluids and nanoparticles, nanoparticle diameter, temperature, and volume fraction of nanoparticles, the proposed model involves several thermophysical parameters such as specific heat, density, and viscosity. The reason for the development of the model requires complex thermophysical parameters because, based on the experiments, these parameters determine the thermal conductivity of nanofluids. Validation of the model through comparison of the model with the experimental results shows that the models that have non-linear correlation have good accuracy in predicting the thermal conductivity of nanofluids.
Highlights
ABSTRACT−This article presents a model of thermal conductivity of nanofluids based on dimensionlessgroup methods
The reason for the development of the model requires complex thermophysical parameters because, based on the experiments, these parameters determine the thermal conductivity of nanofluids
Validation of the model through comparison of the model with the experimental results shows that the models that have non-linear correlation have good accuracy in predicting the thermal conductivity of nanofluids
Summary
Volume 17, Nomor 1, Februari 2020 ISSN : 1829-796X (print); 2514-1713(online) https://ppjp.ulm.ac.id/journal/index.php/f/. In addition to the thermal conductivity of base fluids and nanoparticles, nanoparticle diameter, temperature, and volume fraction of nanoparticles, the proposed model involves several thermophysical parameters such as specific heat, density, and viscosity. PENDAHULUAN Teknologi transfer panas menggunakan fluida saat ini tengah dipelajari secara intensif dalam berbagai bidang seperti pada sistem pembangkit energi, teknologi produksi kimia, manufaktur, dan berbagai bidang modern lainnya (Hubner, Eck, Stiller, & Seitz, 2016; Matthews, Murley, Puettmann, Hickman, & Witt, 2015). Untuk meningkatkan efisiensi proses transfer panas menggunakan fluida, salah satu metode yang diajukan oleh para peneliti adalah pengembangan nanofluida (Kumar, Kumar, Tamilarasan, Sendhilnathan, & Suresh, 2015). Hal menarik dari karakteristik nanofluida adalah sifat konduktivitas termalnya yang lebih tinggi dibandingkan dengan konduktivitas termal fluida dasarnya (base fluids) meskipun jumlah nanopartikel yang didispersikan ke dalamnya relatif kecil. Tabel 1 Beberapa model konduktivitas termal nanofluida Model Maxwell (Mehta, Chauhan, & Kanagaraj, 2011)
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