• Onur Tokkan

  • Theme:Chemical Energy Converters
  • Project:Leidenfrost Self-propulsion of Cryogenic Droplets inside a pipe
  • Supervisor: Andrew Rhead ,Kei Takashina
  • Industry Partner: GKN
  • The Gorgon's Head - Bath University Logo


Onur has recently graduated from the University of Brighton with a first-class honours degree in MEng Automotive Engineering, where he investigated Characteristics of Nanofluid Sprays and their Cooling Performance on a piston surface. A poster produced from the findings of this study was presented at the 29th European Conference on Liquid Atomization and Spray Systems (ILASS). Furthermore, during his studies, he had a chance to work in an electric vehicle conversion project where he focused on designing the thermal management system. The AAPS CDT provided the perfect opportunity to investigate these two areas of interest further in a collaborative and innovative environment. As an AAPS CDT student, he will be carrying out research in the area of Leidenfrost propulsion for cooling flows in AM parts. Outside of the University, he is a passionate racing and a football fan.


  • I have got in excess of 500 Hotwheels and Matchbox models collected
  • I have successfully completed several competitive eating challenges
  • I had a pet rabbit, which was trained to understand commands and would behave more like a dog at times!
  • I am really passionate cook and like trying new recipes when I have some free time

Leidenfrost Self-propulsion of Cryogenic Droplets inside a pipe

Water droplets placed on a surface heated to a sufficient temperature (the Leidenfrost temperature) levitate on a film of their own vapour. A recent Nature article showed that adding a sawtooth pattern to the heated surface causes these levitating droplets to be propelled (even uphill!). Very recent work at Bath has shown that this propulsion can be achieved in mm diameter enclosed pipes. This opens the way to exploitation of Leidenfrost propulsion for active cooling systems that operate without moving parts and use waste heat energy for the thermal pumping effect. Onur will seek to extend this work by using AM techniques to create 3D printed cooling systems with internal ratchet structures. His work will focus on optimum fluid/surface choices (experiments have previously been confined to water) and ensuring AM quality is sufficient to reliably allow propulsion as surface roughness can cause an increase in the Leidenfrost temperature. The effect of pressure on heat transfer will be studied both experimentally and numerically and set in context against current systems.

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