Effect of nanofluids on the thermal performance of a flat micro heat pipe with a rectangular grooved wick |
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| Authors: | Kyu Hyung Do Seok Pil Jang |
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| Affiliation: | 1. Korea Institute of Machinery and Materials, Daejeon 305-343, Republic of Korea;2. School of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang 412-791, Republic of Korea;1. Department of Energy Technology, KTH Royal Institute of Technology, Stockholm, Sweden;2. Department of Materials and Nano Physics, KTH Royal Institute of Technology, Stockholm, Sweden;1. Department of Power Mechanical Engineering, National Tsing Hua University, Hsin-Chu 300, Taiwan, ROC;2. Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Taiwan, ROC;1. Department of Mechanical Engineering, National Institute of Technology, Tiruchirappalli 620015, Tamil Nadu, India;2. Department of Mechanical Engineering, Karunya University, Coimbatore 641 114, Tamil Nadu, India;1. Department of Mechanical Engineering, National Institute of Technology, Tiruchirappalli 620015, Tamil Nadu, India;2. Department of Mechanical Engineering, Bannari Amman Institute of Technology, Erode 638401, Tamil Nadu, India;1. Centre for Research in Material Science & Thermal Management, Karunya University, Coimbatore 641114, India;2. Department of Physics, Bharathiar University, Coimbatore 641046, India;1. Techlegic LLC, USA;2. Department of Mechanical Engineering, Southern Illinois University Edwardsville, Edwardsville, IL 62026, USA |
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| Abstract: | In this paper, the effect of water-based Al2O3 nanofluids as working fluid on the thermal performance of a flat micro-heat pipe with a rectangular grooved wick is investigated. For the purpose, the axial variations of the wall temperature, the evaporation and condensation rates are considered by solving the one-dimensional conduction equation for the wall and the augmented Young–Laplace equation for the phase change process. In particular, the thermophysical properties of nanofluids as well as the surface characteristics formed by nanoparticles such as a thin porous coating are considered. From the comparison of the thermal performance using both DI water and nanofluids, it is found that the thin porous coating layer formed by nanoparticles suspended in nanofluids is a key effect of the heat transfer enhancement for the heat pipe using nanofluids. Also, the effects of the volume fraction and the size of nanoparticles on the thermal performance are studied. The results shows the feasibility of enhancing the thermal performance up to 100% although water-based Al2O3 nanofluids with the concentration less than 1.0% is used as working fluid. Finally, it is shown that the thermal resistance of the nanofluid heat pipe tends to decrease with increasing the nanoparticle size, which corresponds to the previous experimental results. |
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