Critical heat flux (CHF) of the fluoroketone fluid FKE-774 in vertical microgap channels is explored, with a focus on submillimeter spacings. Experiments were conducted using a 20 mm × 20 mm heated aluminum surface. Microgap channel spacings were decreased down to 0.3 mm, providing channel aspect ratios (height/spacing) as high as 67. In the limit where channel spacing is large, CHF was found to be 140 kW/m2 for saturated boiling at atmospheric pressure. A reduction in CHF of 55% was observed for the largest channel aspect ratio investigated. Results for degradation of the CHF limit with decreasing microgap spacing are compared to a correlation available in the literature and show a roughly hyperbolic dependence on channel aspect ratio (height/spacing) for aspect ratios larger than 10.
Confinement Effects on FKE-774 Critical Heat Flux in Buoyancy-Driven Microgap Channels
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received May 5, 2015; final manuscript received October 22, 2015; published online December 8, 2015. Assoc. Editor: Mohamed S. El-Genk.
- Views Icon Views
- Share Icon Share
- Cite Icon Cite
- Search Site
Geisler, K. J. L., and Natarajan, S. (December 8, 2015). "Confinement Effects on FKE-774 Critical Heat Flux in Buoyancy-Driven Microgap Channels." ASME. J. Thermal Sci. Eng. Appl. June 2016; 8(2): 024502. https://doi.org/10.1115/1.4031931
Download citation file:
- Ris (Zotero)
- Reference Manager