Experimental investigation on the Leidenfrost phenomenon of droplet impact on heated silicon carbide surfaces

•Impact regime map of droplet impacting on heated silicon carbide surface is developed.•Droplet spreading dynamics and residence time during Leidenfrost state is analyzed.•Influence of surface roughness, wettability and surface material on the impact behaviors is analyzed.•Existing Leidenfrost tempe...

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Bibliographic Details
Published in:International journal of heat and mass transfer 2019-01, Vol.128, p.1206-1217
Main Authors: Wang, ZeFeng, Xiong, Jinbiao, Yao, Weiyi, Qu, Wenhai, Yang, Yanhua
Format: Article
Language:English
Subjects:
Accident conditions
Atomizing
Breakup
Claddings
Contact angle
Deposition
Droplets
Empirical analysis
Film boiling
Heat transfer
Hydrogen production
Leidenfrost phenomenon
Nuclear accidents & safety
Nucleate boiling
Nucleation
Oxidation
Silicon carbide
Spreading
Surface roughness
Surface roughness effects
Thermodynamic properties
Weber number
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Summary:•Impact regime map of droplet impacting on heated silicon carbide surface is developed.•Droplet spreading dynamics and residence time during Leidenfrost state is analyzed.•Influence of surface roughness, wettability and surface material on the impact behaviors is analyzed.•Existing Leidenfrost temperature models are evaluated. Due to its superiority in suppressing hydrogen generation under severe accident conditions, silicon carbide (SiC) has been regarded as one of the promising candidates among the diverse accident tolerant fuel (ATF) claddings. Droplet impact experiments are conducted on preheated CVD-SiC surfaces with different roughness and the polished sintered-SiC and stainless-steel surface. The effects of surface roughness, contact angle and thermal properties on the impact behavior and cooling efficiency are discussed. The experiments are carried out in the range of 10 
ISSN:0017-9310
1879-2189
DOI:10.1016/j.ijheatmasstransfer.2018.09.091