Heat convection within evaporating droplets in strong aerodynamic interactions |
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| Authors: | Guillaume Castanet Bruno Frackowiak Cameron Tropea Fabrice Lemoine |
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| Affiliation: | 1. CORIA-UMR6614 Normandie Université, CNRS, INSA et Université de Rouen, Av de l''Université, 76800 Saint Etienne du Rouvray, France;3. Joint Graduate School of Energy and Environment, King Mongkut''s University of Technology Thonburi, Bangkok, Thailand;1. Institute of Thermal Engineering, Southeast University, No 2, Sipailou, Nanjing 210096, China;2. Institute of Refrigeration and Cryogenic Engineering, Shanghai Maritime University, No 1550, Harbour Ave, Shanghai,201306, China |
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| Abstract: | The temperature field within evaporating ethanol droplets is investigated, relying on the two-color laser induced fluorescence (LIF) measurement technique and on a Direct Numerical Simulation (DNS). The configuration studied corresponds to a monodisperse droplet stream in a diffusion flame sustained by the droplet vapor. An experimental probe volume, small compared to the droplet size, is used to characterize the temperature field within the droplets, whereas DNS takes into account key aspects of the droplet heating and evaporation such as the non-uniform and transient stress, and the mass and heat transfer coefficients at the droplet surface. These investigations reveal that the frictional stresses are strongly reduced due to the small spacing between the droplets. They also show that the Marangoni effect has a significant influence on the internal motion and hence on the internal temperature field. |
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