A simple thermostat based on self-propelled Leidenfrost droplets is proposed and demonstrated. The proof-of-principle device sits on a heated hotplate, which provides the heat, but under dripping water which cools it. Using temperature dependent directionality of droplets on a substructured sawteeth surface, droplets are either discarded or fed into a region with high Leidenfrost temperature and enhanced heat-loss. The system can therefore adjust how much of the droplets’ cooling power it uses depending on its own temperature, and this feedback enables it to maintain a constant set temperature and act as a thermostat.
A Leidenfrost Thermostat
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received May 22, 2014; final manuscript received November 20, 2014; published online December 17, 2014. Assoc. Editor: W. Q. Tao.
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Cole, A., Jury, B., and Takashina, K. (March 1, 2015). "A Leidenfrost Thermostat." ASME. J. Heat Transfer. March 2015; 137(3): 034502. https://doi.org/10.1115/1.4029238
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