Gas-phase entropy generation during transient methanol droplet combustion |
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| Authors: | Daniel N Pope Vasudevan Raghavan George Gogos |
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| Affiliation: | 1. University of Minnesota Duluth, Department of Mechanical and Industrial Engineering, 105 VKH, 1305 Ordean Court, Duluth, MN 55812-3042, USA;2. Indian Institute of Technology Madras, Chennai 600036, India;3. University of Nebraska-Lincoln, Department of Mechanical Engineering, N104 Walter Scott Engineering Center, Lincoln, NE 68588-0656, USA;1. W351, Department of Mechanical and Materials Engineering, Nebraska Hall, Lincoln, NE 68588-0526, USA;2. 203, TDCE Laboratory, Department of Mechanical Engineering, IIT Madras, Chennai 600 036, India;1. School of Mechanical Engineering, Iran University of Science and Technology, Narmak, Tehran, Iran;2. School of Engineering, University of Glasgow, Glasgow G12 8QQ, United Kingdom;1. Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208, USA;2. NASA Glenn Research Center, Cleveland, OH 44135, USA;3. Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA;1. Refrigeration & Air-conditioning Technical Engineering Department, College of Technical Engineering, The Islamic University, Najaf, Iraq;2. Centre for Modelling & Data Science, Faculty of Science & Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia;3. Department of Mechanical Engineering, Celal Bayar University, 45140 Manisa, Turkey;4. Mechanical Engineering Department, Prince Sultan Endowment for Energy & Environment, Prince Mohammad Bin Fahd University, Al-Khobar 31952, Saudi Arabia;5. Department for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City, Vietnam;6. Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam |
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| Abstract: | A numerical model was used to investigate gas-phase entropy generation during transient methanol droplet combustion in a low-pressure, zero-gravity, air environment.A comprehensive formulation for the entropy generation in a multi-component reacting flow is derived. Stationary methanol droplet combustion in a low ambient temperature (300 K) and a nearly quiescent atmosphere was studied and the effect of surface tension on entropy generation is discussed. Results show that the average entropy generation rate over the droplet lifetime is higher for the case that neglects surface tension. Entropy generation during the combustion of methanol droplets moving in a high-temperature environment (1200 K), as seen in a typical spray combustion system, is also presented. Entropy generation due to chemical reaction increases and entropy generation due to heat and mass transfer decreases with an increase in initial Reynolds number over the range of initial Reynolds numbers (1–100) considered. Contributions due to heat transfer and chemical reaction to the total entropy generation are greater than the contribution due to mass transfer. Entropy generation due to coupling between heat and mass transfer is negligible. For moving droplets, the lifetime averaged entropy generation rate presents a minimum value at an initial Reynolds number of approximately 55. |
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