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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

EXPERIMENTAL INVESTIGATION OF CARBON DIOXIDE DRY-ICE ASSISTED JET IMPINGEMENT COOLING PERFORMANCE

DOI: 10.1615/TFESC1.fnd.012987
pages 977-980

Dongsu Kim
Innovative Thermal Engineering Laboratory School of Mechanical Engineering Ulsan National Institute of Science Technologies (UNIST) Ulsan, S. Korea 689-798

Jaeseon Lee
UNIST


KEY WORDS: Jet impingement, carbon dioxide, sublimation, solid gas phase change, spot cooling

Abstract

The novel concept of dry-ice assisted jet impingement cooling is suggested by current study. When the carbon-dioxide (CO2) passes through the tiny orifice gap or jet nozzle, it experiences the rapid temperature drop as well as pressure decrease by the Joule-Thomson effect. This temperature drop causes the formation of small CO2 dry-ice particles. Besides the enhanced cooling performance by lowered bulk-jet temperature, the improved heat transfer can be expected by the additional sublimation effect between the dry-ice particles and cooling target surface. The cooling performance comparison was performed experimentally between the suggested CO2 solid-gas two-phase jet and the single phase nitrogen (N2) jet. Both jet fluids are impinged on the electrically heated flat heater surface and their heat transfer coefficients are measured. The performance of impinging jet for both fluids are also evaluated by the variance of flow parameter like Reynolds number and jet geometry configurations.

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