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http://dx.doi.org/10.6110/KJACR.2011.23.2.132

Large Eddy Simulation of Heat Transfer Performance Enhancement due to Unsteady Flow in Compound Channels  

Hong, Seong-Ho (Department of Mechanical Engineering, Korea University)
Shin, Jong-Keun (Department of Automotive Engineering, Hanzhong University)
Choi, Young-Don (Department of Mechanical Engineering, Korea University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.23, no.2, 2011 , pp. 132-138 More about this Journal
Abstract
In the present article, we investigate numerically turbulent flow of air through compound rectangular channels. Large eddy simulation(LES) is employed for unsteady turbulence modeling. LES gives better predictions for the axial mean velocity distribution than those of other turbulent models. Strong large-scale quasi-periodic flow oscillations are observed in most of the geometries investigated. Such large-scale flow oscillations in compound rectangular channels are similar to the quasi-periodic flow pulsation through the gaps between fuel rod bundle in nuclear reactor. It exists in any longitudinal connecting gap between two flow channels. The frequency of this flow oscillation is determined by the geometry of the gap. The large scale cross motions through the rectangular compound channels induce significant heat transfer enhancement of the compound channel flow.
Keywords
Gap; Compound channels; Turbulent flow; Large eddy simulation; Heat transfer; Flow pulsation; Unsteady flow; Turbulent model;
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1 Speziale, C. G., Sarkar, S. and Gatski, T. B., 1991, Modeling of the pressure-strain correlation tensor：an invariant dynamical systems approach, J. Fluid Mech., Vol. 227, pp. 245-272.   DOI
2 Seale, W. J., 1979, Turbulent diffusion of heat between connected flow passage, part2:prediction using the $\kappa-\varepsilon$ turbulent model, Numerical Engineering and Design, Vol. 54, pp. 197- 209.   DOI   ScienceOn
3 Meyer, L. and Rehme, K., 1994, Large-scale turbulence phenomena in compound rectangular channels, Experimental Thermal and Fluid Science, Vol. 8, pp. 286-304.   DOI   ScienceOn
4 Lee, C. M., Yang, S. K., Chun, S. Y., Chung, M. K., and Rhim, Y. C., 1998, Experimental study on turbulent mixing in two parallel channels, Proc. of the KSME(B), pp. 604-609.
5 Seo, J. S., Shin, J. K. and Choi, Y. D., 2008, The flow pulsation of a compound rectangular channel, JSME-KSME 7th Thermal and Fluids Engineering Conference, p. 35.
6 CFX-11 Solver Theory, Ansys Inc., 2007.
7 Menter, F. R., Kuntz, M. and Langtry, R., 2003, Ten years of industrial experience with the SST turbulence model, Proc. Turbulence, Heat and Mass Transfer, Vol. 4, pp. 625-632.
8 Lyall, H. G., 1971, Measurement of flow distribution and secondary flow in ducts composed of two square interconnected subchannels, Symp. on Internal Flows, Salfod, UK, E16-E23.