Convection in the liquid at droplet squeezing out of the capillary

Convection in the liquid at droplet squeezing out of the capillary

Bibliographic Details
Parent link:International Journal of Heat and Mass Transfer
Vol. 200.— 2023.— [123524, 10 p.]
Corporate Authors: Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов, Национальный исследовательский Томский политехнический университет Инженерная школа энергетики Научно-образовательный центр И. Н. Бутакова (НОЦ И. Н. Бутакова)
Other Authors: Misyura S. Ya. Sergey Yakovlevich, Strizhak P. A. Pavel Alexandrovich, Volkov R. S. Roman Sergeevich, Morozov V. S. Vladimir
Summary:Title screen
Experimental studies of droplet geometry and instantaneous velocity field in the liquid at a rapid change in the droplet shape are conducted. A droplet is squeezed out of the capillary in the presence of an external air flow. This article for the first time shows that when a droplet surface changes, impurities from the ambient air accumulate on the free surface within 10 s rather than instantly. Consequently, the average velocity in the drop varies from 90 mm/s to 3 mm/s. As the air temperature increases, the liquid in the drop heats up and the dynamic viscosity of both the drop and the air changes. Therefore, with an increase in air temperature from 20 to 100 ° C, the convection velocity in the drop increases almost two times from 0.1 to 0.2 ms. In practice we often have to deal with droplets and gas-droplet flows when fast-flowing processes are implemented. The lifetime of the droplet, after its formation from the nozzle, is a short time interval (0.001 s – 1 s). For correct modeling of the gas droplet flow, it is necessary to take into account the change in the convection velocity in the droplet, which changes with time.
Published: 2023
Subjects:
электронный ресурс
труды учёных ТПУ
droplet
convection liquid vortex motion
PIV measurements
капли воды
вихревое движение
Online Access:https://doi.org/10.1016/j.ijheatmasstransfer.2022.123524
Format: Electronic Book Chapter
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=668347

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