TY - JOUR

T1 - Measurement of Temperature Profiles Near the Liquid–Gas Interface during Evaporation of Water and Ethanol into Air

AU - Gatapova, E. Ya

N1 - The study was supported by Russian Science Foundation (project no. 20-19-00722, https://rscf.ru/en/project/20-19-00722/). Публикация для корректировки.

PY - 2023/8

Y1 - 2023/8

N2 - The article experimentally studies the temperature field of a two-layer liquid–gas system at normal atmospheric pressure for an axisymmetric configuration. Temperature measurements were carried out for a thin layer of water and ethanol about 2 mm thick with local heating and evaporation into air using a microthermocouple with a flat bead about 3 μm thick, moving across the layers with a step of 48 nm. A fluoroplastic cuvette with liquid with a diameter of 35 mm and a heater (diameter 1.6 mm) in the center was located inside a box measuring 800 × 500 × 350 mm3, so that evaporation occurs into air with controlled temperature and humidity. The evolution of the temperature profile near the liquid–air interface was obtained with an increase in the heater temperature up to 88°C. Depending on environmental conditions and the type of liquid, the temperature in the gas phase near the interface may be higher or lower than the temperature of the liquid. It is shown that for a volatile liquid (ethanol), the temperature profile is completely different than for a nonvolatile liquid. Namely, the temperature in the gas phase near the liquid–gas interface is higher than in the liquid at the interface throughout the entire temperature range considered, which is explained by convective flow in ethanol.

AB - The article experimentally studies the temperature field of a two-layer liquid–gas system at normal atmospheric pressure for an axisymmetric configuration. Temperature measurements were carried out for a thin layer of water and ethanol about 2 mm thick with local heating and evaporation into air using a microthermocouple with a flat bead about 3 μm thick, moving across the layers with a step of 48 nm. A fluoroplastic cuvette with liquid with a diameter of 35 mm and a heater (diameter 1.6 mm) in the center was located inside a box measuring 800 × 500 × 350 mm3, so that evaporation occurs into air with controlled temperature and humidity. The evolution of the temperature profile near the liquid–air interface was obtained with an increase in the heater temperature up to 88°C. Depending on environmental conditions and the type of liquid, the temperature in the gas phase near the interface may be higher or lower than the temperature of the liquid. It is shown that for a volatile liquid (ethanol), the temperature profile is completely different than for a nonvolatile liquid. Namely, the temperature in the gas phase near the liquid–gas interface is higher than in the liquid at the interface throughout the entire temperature range considered, which is explained by convective flow in ethanol.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85188114518&origin=inward&txGid=b975ed4917f05c1e9d9576d9e6fc4cad

UR - https://www.mendeley.com/catalogue/273578b3-8f99-3d07-95f0-21237a8140df/

U2 - 10.1134/S0018151X23040053

DO - 10.1134/S0018151X23040053

M3 - Article

VL - 61

SP - 525

EP - 534

JO - High Temperature

JF - High Temperature

SN - 0018-151X

IS - 4

ER -