Relationship between thermoelectric figure of merit and energy conversion efficiency
Name
Kim-2015-Relationship between.pdf
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Author(s)
Kim, Hee Seok
Liu, Weishu
Chen, Gang
Chu, Ching-Wu
Ren, Zhifeng
Date Issued
July 2015
Journal
Proceedings of the National Academy of Sciences
Publisher
National Academy of Sciences (U.S.)
Citation
Kim, Hee Seok, Weishu Liu, Gang Chen, Ching-Wu Chu, and Zhifeng Ren. “Relationship Between Thermoelectric Figure of Merit and Energy Conversion Efficiency.” Proc Natl Acad Sci USA 112, no. 27 (June 22, 2015): 8205–8210. © 2015 American Meteorological Society
Version
Final published version
Abstract
A multiwavenumber theory is formulated to represent eddy diffusivities. It expands on earlier single-wavenumber theories and includes the wide range of wavenumbers encompassed in eddy motions. In the limiting case in which ocean eddies are only composed of a single wavenumber, the multiwavenumber theory is equivalent to the single-wavenumber theory and both show mixing suppression by the eddy propagation relative to the mean flow. The multiwavenumber theory was tested in a region of the Southern Ocean (70°–45°S, 110°–20°W) that covers the Drake Passage and includes the tracer/float release locations during the Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean (DIMES). Cross-stream eddy diffusivities and mixing lengths were estimated in this region from the single-wavenumber theory, from the multiwavenumber theory, and from floats deployed in a global k[subscript 0]° Parallel Ocean Program (POP) simulation. Compared to the single-wavenumber theory, the horizontal structures of cross-stream mixing lengths from the multiwavenumber theory agree better with the simulated float-based estimates at almost all depth levels. The multiwavenumber theory better represents the vertical structure of cross-stream mixing lengths both inside and outside the Antarctica Circumpolar Current (ACC). Both the single-wavenumber and multiwavenumber theories represent the horizontal structures of cross-stream diffusivities, which resemble the eddy kinetic energy patterns.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1073/pnas.1510231112
