Pool boiling of perfluorocarbon mixtures on silicon surfaces |
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| Authors: | Mehmet Arik Avram Bar-Cohen |
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| Affiliation: | 1. Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia;2. Chemical Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran;3. Mechanical Engineering Department, Arsenjan-Branch, Islamic Azad University, Fars, Iran;4. Chemistry Department, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran;1. Department of Chemical Engineering Science, Graduate School of Engineering, Yokohama National University, 79-5, Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan;2. School of Mechanical Engineering, Tianjin University, No. 135 Yaguan Road, Tianjin Haihe Education Park, Tianjin 300354, China;3. Key Laboratory of Efficient Utilization of Low and Medium Grade Energy (Tianjin University), Ministry of Education of China, Tianjin University, China;1. Technical Vocational School of Higher Education, Atatürk University, Erzurum, 25240, Turkey;2. Department of Mechanical Engineering, Ataturk University, Erzurum, 25240, Turkey;1. Wroclaw University of Science and Technology, Faculty of Mechanical and Power Engineering, Wyb. Wyspianskiego 27, 50-370 Wroclaw, Poland;2. Univ Lyon, CNRS, INSA-Lyon, Université Claude Bernard Lyon 1, CETHIL UMR5008, F-69621 Villeurbanne, France |
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| Abstract: | The need for higher pool boiling critical heat flux (CHF) in electronic cooling applications has turned attention to the use of binary mixtures of dielectric liquids. The available literature demonstrates that the addition of a liquid with higher saturation temperature, higher molecular weight, higher viscosity and higher surface tension can lead to significant enhancement of CHF, beyond what can be achieved through changes in pressure, liquid subcooling, and the product of surface effusivity and heater thickness. The current study focuses on extending the available data on mixture CHF enhancement, as well as pool boiling, on polished silicon surfaces to FC-72/FC-40 mixture ratios of 10%, 15%, and 20% of FC-40 by weight, a pressure range of between 1 and 3 atm, and fluid temperature from 22 to 45 °C, leading to high subcooling conditions. It is found that peak heat flux can be increased to as high as 56.8 W/cm2 compared to 25.2 W/cm2 for pure FC-72 at 3 atm and 22 °C. It is believed that the increase in the mixture latent heat of evaporation and surface tension, accompanying the depletion of the lower boiling point fluid in the wall region plays the major role in enhancing the critical heat flux for binary mixtures. |
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