Abstract
On earth, gravity barely influences the dynamics of interfaces. For what concerns bubbles, buoyancy governs the dynamics of boiling mechanism and thus affects boiling heat transfer capacity. While, for droplets, the coupled effects of wettability and gravity affects interface exchanges. In space, in the lack of gravity, rules are changed and new phenomena come into play. The present work is aimed to study the effects of electric field on the shape and behaviour of bubbles and droplets in order to understand how to handle microgravity applications; in particular, the replacement of gravity with electric field and their coupled effects are evaluated. The experiments spread over different setups, gravity conditions, working fluids, interface conditions. Droplets and bubbles have been analysed with and without electric field, with and without (adiabatic) heat and mass transfer across the interface. Furthermore, the results of the 4 ESA Parabolic Flight Campaigns (PFC 58, 60, 64 & 66), for adiabatic bubbles, adiabatic droplets and evaporating droplets, will be summarized, discussed, and compared with the ground tests.
Highlights
Boiling Boiling heat transfer has been widely studied in the past, in particular, several studies have addressed and speculated on the mechanisms leading to critical heat flux (CHF), the limiting condition of all boiling heat transfer processes, generally associated with the formation of an irreversible dry spot responsible of a drastic reduction of the local heat transfer coefficient, which can lead to catastrophic burnout of the boiling surface
In the present study we want to underline the importance of the electric field in increasing the limiting value of CHF, increasing safety and capacity of the heat transferred from a surface
A study has been performed showing an increase of about 27% in CHF and heat transfer coefficient (HTC, see Figure 18Figure 19)
Summary
- The interface dynamics of bicontinuous phase separating structure in a polymer blend Haruko Saito, Masahiro Yoshinaga, Takaaki Mihara et al. - Geometrical model of a self-propelled broken interface Miki Y Matsuo and Masaki Sano. View the article online for updates and enhancements. This content was downloaded from IP address 146.241.155.155 on 01/07/2021 at 08:24. 35th UIT Heat Transfer Conference (UIT2017) IOP Conf. Effects of Force Fields on Interface Dynamics, in view of TwoPhase Heat Transfer Enhancement and Phase Management for Space Applications
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