The surface temperature of free evaporating drops

All-Russian Conference with the School for Young Scientists “Thermophysics and Physical Hydrodynamics –2016”

Borodulin, V.Y.^1 ; Letushko, V.N.^1 ; Nizovtsev, M.I.^1 ; Sterlyagov, A.N.^1

Kutateladze Institute of Thermophysics, 1 Ac. Lavrentiev ave., Novosibirsk, Russia^1

关键词: Calculation results;    Conventional diffusion model;    Evaporation process;    Heat and mass transfer process;    Polypropylene fiber;    Surface temperatures;    Theoretical calculations;    Theoretical investigations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/754/3/032018/pdf
DOI  :  10.1088/1742-6596/754/3/032018

来源: IOP

【 摘 要 】

Complex experimental and theoretical investigation of heat and mass transfer processes was performed at evaporation of free liquid drops. For theoretical calculation the emission-diffusion model was proposed. This allowed taking into account the characteristics of evaporation of small droplets, for which heat and mass transfer processes are not described in the conventional diffusion model. The calculation results of evaporation of droplets of different sizes were compared using two models: the conventional diffusion and emission-diffusion models. To verify the proposed physical model, the evaporation of droplets suspended on a polypropylene fiber was experimentally investigated. The form of droplets in the evaporation process was determined using microphotographing. The temperature was measured on the surfaces of evaporating drops using infrared thermography. The experimental results have showed good agreement with the numerical data for the time of evaporation and the temperature of evaporating drops.