Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session L03: Heat Transfer, Evaporation and Buoyancy Effects II
8:00 AM–10:36 AM,
Monday, November 20, 2023
Room: Ballroom C
Chair: Etienne Robert, Polytechnique Montréal
Abstract: L03.00002 : Evaporation Behaviour of a Pair of Sessile Droplets on a Heated Substrate*
8:13 AM–8:26 AM
Presenter:
Alidad Amirfazli
(York Univ)
Authors:
Ahmed Azzam
(York University)
Alidad Amirfazli
(York Univ)
Roger Kempers
(York university)
Experiments were conducted to monitor the changes in contact angle and surface temperature of pairs of droplets during evaporation for different substrate temperatures. The temperature distributions over the droplet surfaces were visualized using an infrared camera. Also, it aims to study the effect of the high vapour concentration wedge area, formulated between the droplets when they come close to each other, on evaporation behaviour.
The results demonstrated a relationship between the droplet separation distance and the uniformity of temperature distribution of their surfaces. We further determined a critical separation distance beyond which the temperature distributions were relatively uniform. This threshold separating distance proves that the effect of the wedge area formulated between the droplets is less, and the droplets behave as if they are isolated single ones. In addition, the substrate's temperature significantly affects the initial contact angle of the droplets, in which increasing the substrate temperature decreases the contact angle of the droplet. The evaporation process can be optimized with the help of this knowledge, leading to higher control and consistency in industrial applications.
These findings positively enhance numerous industrial applications, resulting in improved performance in fields where evaporation is crucial.
*ESA (European Space Agency), MAP Evaporation Program
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