Experimental microchannel heat sink performance studies using nanofluids |
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| Affiliation: | 1. Department of Mechanical Engineering, Kermanshah University of Technology, Kermanshah, Iran;2. Sustainable Management of Natural Resources and Environment Research Group, Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Vietnam;1. Mechanical Engineering Department, Prince Sultan Endowment for Energy and Environment, Prince Mohammad Bin Fahd University, Al-Khobar 31952, Saudi Arabia;2. RAK Research and Innovation Center, American University of Ras Al Khaimah, United Arab Emirates;3. Mechanical Engineering Department, Islamic Azad University, West Tehran Branch, Tehran, Iran;1. Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia;2. Malaysia – Japan International Institute of Technology (MJIIT), University Teknologi Malaysia Kuala Lumpur, Jalan Sultan Yahya Petra (Jalan Semarak), 54100 Kuala Lumpur, Malaysia;1. Department of Mechanical Engineering, International Islamic University Malaysia, 50728, Gombak, Malaysia;2. Department of Mechanical Engineering, University of Anbar, Ramadi 31001, Iraq;3. Department of Mechanical Engineering, University of Nevada, Las Vegas, NV 89154, USA;4. DNV GL, Engineering Department, Las Vegas, NV 89146, USA |
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| Abstract: | In this study, microchannel heat sink (MCHS) performance using nanofluids as coolants is addressed. We first carried out a simple theoretical analysis that indicated more energy and lower MCHS wall temperature could be obtained under the assumption that heat transfer could be enhanced by the presence of nanoparticles. Experiments were then performed to verify the theoretical predictions. A silicon MCHS was made and CuO–H2O mixtures without a dispersion agent were used as the coolants. The CuO particle volume fraction was in the range of 0.2 to 0.4%. It was found that nanofluid-cooled MCHS could absorb more energy than water-cooled MCHS when the flow rate was low. For high flow rates, the heat transfer was dominated by the volume flow rate and nanoparticles did not contribute to the extra heat absorption. The measured MCHS wall temperature variations agreed with the theoretical prediction for low flow rate. For high flow rate, the measured MCHS wall temperatures did not completely agree with the theoretical prediction due to the particle agglomeration and deposition. It was also found that raising the nanofluid bulk temperature could prevent the particles from being agglomerated into larger scale particle clusters. The experimental result also indicated that only slightly increase in pressure drop due to the presence of nanoparticles in MCHS operation. |
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