fluids-05-00188.pdf (2.67 MB)
Numerical simulation of single-droplet dynamics, vaporization, and heat transfer from impingement onto static and vibrating surfaces
journal contribution
posted on 2023-06-09, 21:59 authored by Jisjoe Thalackottore Jose, Julian DunneJulian DunneA numerical study is presented to examine the behavior of a single liquid droplet initially passing through air or steam, followed by impingement onto a static or vibrating surface. The fluid dynamic equations are solved using the Volume of Fluid method, which includes both viscous and surface tension effects, and the possibility of droplet evaporation when the impact surface is hot. Initially, dynamic behavior is examined for isothermal impingement of a droplet moving through air, first without and then with boundary vibration. Isothermal simulations are used to establish how droplet rebound conditions and the time interval between initial contact to detachment vary with droplet diameter for droplet impingement onto a stationary boundary. Heat transfer is then assessed for a liquid droplet initially at saturation temperature passing through steam, followed by contact with a hot vibrating boundary, in which droplet evaporation commences. The paper shows that, for droplet impingement onto a static boundary, the minimum impact velocity for rebound reduces linearly with droplet diameter, whereas the time interval between initial contact and detachment appears to increase linearly with droplet diameter. With the introduction of a vibrating surface, the minimum relative impact velocity for isothermal rebound is found to be higher than the minimum impact velocity for static boundary droplet rebound. For impingement onto a hot surface, in which droplet evaporation commences, it is shown that large-amplitude surface vibration reduces heat transfer, whereas low-amplitude high-frequency vibration appears to increase heat transfer.
History
Publication status
- Published
File Version
- Published version
Journal
FluidsISSN
2311-5521Publisher
MDPIPublisher URL
External DOI
Issue
4Volume
5Page range
1-24Article number
a188Pages
24.0Department affiliated with
- Engineering and Design Publications
Notes
Please note that this is an early access version. The complete PDF, HTML, and XML versions will be available soonFull text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2020-10-28First Open Access (FOA) Date
2020-10-28First Compliant Deposit (FCD) Date
2020-10-27Usage metrics
Categories
No categories selectedLicence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC