Freezing of water droplets on solid surfaces: An experimental and numerical study

•We study the heat transfer of water droplets freezing on supercooled surfaces.•A droplet changing from water to ice shows four distinct consecutive processes.•Nucleation during recalescence results in ultrafast rise of droplet temperature.•A long freezing process follows recalescence and is driven...

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Vydáno v:Experimental thermal and fluid science Ročník 57; s. 86 - 93
Hlavní autoři: Chaudhary, Gaurav, Li, Ri
Médium: Journal Article
Jazyk:angličtina
Vydáno: Amsterdam Elsevier Inc 01.09.2014
Elsevier
Témata:
Applied sciences
Cooling
Droplets
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Freezing
Fundamental areas of phenomenology (including applications)
Heat conduction
Heat transfer
Heat transfer in inhomogeneous media, in porous media, and through interfaces
Mathematical analysis
Mathematical models
Physics
Supercooled surface
Theoretical studies. Data and constants. Metering
Water droplet
Wettability
Supercooled surface
Wettability
Water droplet
Freezing
Heat transfer
Water
Numerical simulation
Supercooling
Defrosting
Experimental study
Droplet
Solidification
ISSN:0894-1777, 1879-2286
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Shrnutí:•We study the heat transfer of water droplets freezing on supercooled surfaces.•A droplet changing from water to ice shows four distinct consecutive processes.•Nucleation during recalescence results in ultrafast rise of droplet temperature.•A long freezing process follows recalescence and is driven by heat transfer.•Pre-recalescence temperature and surface wettability affect droplet freezing time. We present an experimental and numerical study on the freezing of static water droplets on surfaces with different wettability when the surfaces are subject to rapid cooling. Temperature evolution of the droplets is recorded using both intrusive and non-intrusive methods to identify the processes involved in the cooling and phase change of the droplets. It is found the time taken for a droplet to freeze depends on the droplet temperature at the pre-recalescence instant as well as the surface wettability. To provide insight into the heat transfer during the freezing process, thermal simulation is carried out by numerically solving the enthalpy-based heat conduction equation. To determine the initial and boundary conditions for the simulation of freezing, the thermal history of the droplet prior to the occurrence of freezing is numerically analyzed by solving single phase heat conduction driven by rapid cooling. The numerical results of droplet freezing are compared to the experimental data, showing close agreement on the freezing time.
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ISSN:0894-1777
1879-2286
DOI:10.1016/j.expthermflusci.2014.04.007