Study on improving cryogenic cooling rate on polymer-coated metal surfaces
In order to operate cryogenic applications, initial cooling from room temperature to operating temperature is required. Boiling heat transfer occurs between the liquid and solid interface during initial cooling using cryogenic fluid. During most of the initial cooling process, it is the film boiling that the vapor film acts as a thermal resistance and has low heat transfer. Polymer coatings on metal surfaces cause fast transient from film boiling to transition boiling. Patterned coatings were fabricated with various coating thicknesses and coating ratios. Patterned coating specimens were experimented in pool boiling and flow boiling using liquid nitrogen. The patterned coating specimens had a maximum cooling time reduction of 64% and 88% compared to bare specimens in pool boiling and fluid boiling, respectively. In addition, the bubble overlap effect was analyzed through bubble visualization, and a 2D axisymmetric thermal simulation model considering the bubble overlap effect was presented. The maximum error of the simulation model was 14%.
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- 2000 Levy Ave.
- Tallahassee, Florida
- United States 32310
- Building: BLDG. A.
- Room Number: 147 Large Conference Room
Speakers
Youngjun
Study on improving cryogenic cooling rate on polymer-coated metal surfaces
Biography:
Dr. Choi will introduce his ph.D. work on cryogenic cooling and cover other topics. He recently received a ph.D. at Department of mechanical engineering, the Changwon National University in South Korea. He is currently a post-doctoral research associate at Center for Advanced Power Systems, FSU.