Abstract
This thesis investigates several phase-change scenarios to illustrate the role of turbulent flows in the phase-change processes, including melting/freezing (part I: chapters 1–7) and evaporation/condensation (part II: chapters 8–10).
In Part I, our study focused on exploring melting and freezing processes in various scenarios, including basal melting through heating from below (chapter 1), temperature oscillation effect on heat transfer (chapter 2), and melt rate (chapter 3) in Rayleigh-Bénard convection, which relates to diurnal and seasonal cycles in natural systems, surface melting by solar radiative heating from above and analyzed the evolution of melt ponds (chapter 4), vertical ice front melting in freshwater (chapter 5) and salty water (chapter 6), and the melting of elliptical ice with different aspect ratios in a cross-flow (chapter 7). Our study provided insights into the melting and freezing processes in different ambient conditions and geometries, contributing to a better understanding of the melting/freezing dynamics in nature and the impact of turbulent flows on melting/freezing processes.
In Part II, our focus was on studying evaporation and condensation processes in various pandemic-related scenarios, including quantifying the lifetime of the droplets in the turbulent and humid coughing puff (chapter 8) and analyzing the impact of ambient temperature and humidity on the droplet lifetime (chapter 9), and the effect of indoor displacement ventilation on the clean zone height h with a human present, sitting, and breathing inside the room. Our study provided valuable insights into the evaporation and condensation processes in different pandemic-related scenarios, contributing to a better understanding of the dynamics of microdroplets and the impact of ventilation rates on clean zone heights.
In Part I, our study focused on exploring melting and freezing processes in various scenarios, including basal melting through heating from below (chapter 1), temperature oscillation effect on heat transfer (chapter 2), and melt rate (chapter 3) in Rayleigh-Bénard convection, which relates to diurnal and seasonal cycles in natural systems, surface melting by solar radiative heating from above and analyzed the evolution of melt ponds (chapter 4), vertical ice front melting in freshwater (chapter 5) and salty water (chapter 6), and the melting of elliptical ice with different aspect ratios in a cross-flow (chapter 7). Our study provided insights into the melting and freezing processes in different ambient conditions and geometries, contributing to a better understanding of the melting/freezing dynamics in nature and the impact of turbulent flows on melting/freezing processes.
In Part II, our focus was on studying evaporation and condensation processes in various pandemic-related scenarios, including quantifying the lifetime of the droplets in the turbulent and humid coughing puff (chapter 8) and analyzing the impact of ambient temperature and humidity on the droplet lifetime (chapter 9), and the effect of indoor displacement ventilation on the clean zone height h with a human present, sitting, and breathing inside the room. Our study provided valuable insights into the evaporation and condensation processes in different pandemic-related scenarios, contributing to a better understanding of the dynamics of microdroplets and the impact of ventilation rates on clean zone heights.
| Original language | English |
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| Qualification | Doctor of Philosophy |
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| Supervisors/Advisors |
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| Award date | 30 Nov 2023 |
| Place of Publication | Enschede |
| Publisher | |
| Print ISBNs | 978-90-365-5827-3 |
| Electronic ISBNs | 978-90-365-5828-0 |
| DOIs | |
| Publication status | Published - 30 Nov 2023 |