Evolution of convective structure and heat transfer in evaporating films under cyclic conditions
Document Type
Conference Proceeding
Publication Date
1-1-2018
Abstract
© 2018, AIAA Aerospace Sciences Meeting. All rights reserved. The convective-structure and heat transfer characteristics of evaporating films under conditions of cyclical superheating were examined experimentally. An isolated test cell allowed the films to evaporate into their own vapor without non-condensable gases present. The level of superheat was controlled by modulating the system pressure. A double-pass schlieren system was employed to capture convective structures, and a non-intrusive thickness measurement technique was used to yield dynamic heat flux measurements at the film surface. The evolution of the superheat level has a strong impact on the development of convective structures and heat transfer. In some cases convective structures appear within the film under pressure-modulated conditions even when the evaporation intervals are sufficiently short that conduction is the dominant heat transfer mode. Convective structures persist in many cases after evaporation is stopped. Stopping the evaporation for short time intervals have a negligible effect on the convective structure. Complex, multi-wavelength convective structure behavior can be induced through cyclical superheating of the films.
Publication Title
AIAA Aerospace Sciences Meeting, 2018
Recommended Citation
Gonzalez-Pons, J.,
Hermanson, J.,
&
Allen, J.
(2018).
Evolution of convective structure and heat transfer in evaporating films under cyclic conditions.
AIAA Aerospace Sciences Meeting, 2018(210059).
http://doi.org/10.2514/6.2018-1538
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/13991