Study on Thermal Radiation Transfer Characteristics of Single Droplet
Atomization evaporation was a high-energy consumption process widely used in indus-trial fields such as energy storage,carbon capture,and wastewater treatment.Using thermal radi-ation to heat droplets can not only achieve volumetric rapid heating,but also easily combine solar energy to achieve green production.In order to achieve efficient and fast heating of droplets in the fog field by thermal radiation,this paper conducted research on the radiation transfer performance of a single droplet.Firstly,a systematic model,including reflection,absorption and transmission under different condition of external radiations,droplet shapes and radiation properties was set up according to Zone Method.Secondly,the analyses of radiation transfer characteristics were carried out with projection angle between 0 and 180°,droplet length-width ratio between 1 and 10,equiv-alent diameter between 0.1 and 1.0mm,absorption coefficient between10 and 15000 m-1,refractive index between 1.2 and 2 The results indicate that in the reflection process,the overall reflectivity of droplet is independent of their equivalent diameter and absorption coefficient;In the absorption process,droplet has two absorption modes for radiation:surface absorption and volumetric absorp-tion.When the optical thickness of the droplet is less than 1,volumetric absorption dominates.At this time,increasing the absorption coefficient or refractive index can enable the droplet to achieve uniform and rapid heating;The larger the aspect ratio,the greater the heating rate,and the stronger the selectivity to external projection orientation;The overall absorption rate of droplets decreases with a decrease in equivalent diameter or an increase in aspect ratio,and remains almost unchanged with the direction of projection;In the transmission process,as the equivalent diameter decreases or the aspect ratio increases,the directional radiation intensity of the transmission radiation located on the opposite side of the projection direction to the long axis rapidly increases,and the overall transmittance of the droplet monotonically increases.The research results of this article can provide reference for the design and regulation of process links such as thermal radiation heating droplets.
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