Analysis of evaporating mist flow for enhanced convective heat transfer |
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| Authors: | Niru Kumari Vaibhav Bahadur Marc Hodes Todd Salamon Paul Kolodner Alan Lyons Suresh V Garimella |
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| Affiliation: | 1. School of Mechanical Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, United States;2. Department of Mechanical Engineering, Tufts University, Medford, MA 02155, United States;3. Bell Laboratories, Alcatel-Lucent, Murray Hill, NJ 07974, United States;4. Department of Chemistry, City University of New York, Staten Island, NY 10314, United States;1. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Beijing Key Laboratory for Energy Saving and Emission Reduction of Metallurgical Industry, Beijing 100083, China;1. Department of Mechanical Engineering, Celal Bayar University, Manisa, Turkey;2. Department of Mechanical Engineering, Technology Faculty, F?rat University, Elaz??, Turkey;1. Department of Chemical Engineering, IIT Kharagpur, Kharagpur 721302, West Bengal, India;2. Department of Mechanical Engineering, IIT Kharagpur, Kharagpur 721302, India;1. College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China;2. The 703 Research Institute of CSIC, Turbine Research Institute, Harbin 150036, China;1. MIT Portugal – EDAM, University of Minho, School of Engineering, Campus de Azurém, 4800-058 Guimarães, Portugal;2. MEtRICs, University of Minho, Mechanical Engineering Dept., Campus de Azurém, 4800 Guimarães, Portugal;3. ADAI-LAETA, Mechanical Engineering Department, University of Coimbra, Rua Luis Reis Santos, 3030-788 Coimbra, Portugal;4. IN+, Mechanical Engineering Department, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais, 1049-001 Lisboa, Portugal |
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| Abstract: | Enhancement of forced convective heat transport through the use of evaporating mist flow is investigated analytically and by numerical simulation. A two-phase mist, consisting of finely dispersed water droplets in an airstream, is introduced at the inlet of a longitudinally-finned heat sink. The latent heat absorbed by the evaporating droplets significantly reduces the sensible heating of the air inside the heat sink which translates into higher heat-dissipation capacities. The flow and heat transfer characteristics of mist flows are studied through a detailed numerical analysis of the mass, momentum and energy transport equations for the mist droplets and the airstream, which are treated as two separate phases. The coupling between the two phases is modeled through interaction terms in the transport equations. The effects of inlet mist droplet size and concentration on the thermal performance of the heat sink are analyzed parametrically. The results provide insight into the complex transport processes associated with mist flows. The simulations indicate that significantly higher heat transfer coefficients are obtained with mist flows as compared to air flows, highlighting the potential for the use of mist flows for enhanced thermal management applications. |
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