Corrugated walls are widely used as passive devices for heat and mass transfer enhancement; they are most effective when operated at transitional and turbulent Reynolds numbers. In the present study, direct numerical simulation is used to investigate the unsteady forced convection in sinusoidal, symmetric wavy channels. A novel numerical method is employed for the simulations; it is meant for fully developed flows in periodic ducts of prescribed wall temperature. The algorithm is free of iterative procedures; it accounts for the effects of streamwise diffusion and can be used for unsteady problems. Results of two simulations in the transitional regime for Reynolds numbers based on average duct height and average velocity of and are reported. Time averaged and instantaneous velocity and temperature fields together with second-order statistics are interpreted in order to describe the mechanism associated with heat transfer augmentation. Heat flux distributions locate the most active areas in heat transfer and reveal the effects of convective mixing. Slanted traveling waves of high temperature are identified; peak values of Nusselt number are attained when the high-temperature fluid of the waves reaches the converging walls.
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e-mail: enrico.stalio@unimore.it
e-mail: piller@units.it
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Direct Numerical Simulation of Heat Transfer in Converging–Diverging Wavy Channels
E. Stalio,
E. Stalio
Dipartimento di Ingegneria Meccanica e Civile,
e-mail: enrico.stalio@unimore.it
Università degli Studi di Modena e Reggio Emilia
, via Vignolese 905/b, 41100 Modena, Italy
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M. Piller
M. Piller
Dipartimento di Ingegneria Civile e Ambientale,
e-mail: piller@units.it
Università degli Studi di Trieste
, Sezione Georisorse e Ambiente, via A. Valerio 10, 34127 Trieste, Italy
Search for other works by this author on:
E. Stalio
Dipartimento di Ingegneria Meccanica e Civile,
Università degli Studi di Modena e Reggio Emilia
, via Vignolese 905/b, 41100 Modena, Italye-mail: enrico.stalio@unimore.it
M. Piller
Dipartimento di Ingegneria Civile e Ambientale,
Università degli Studi di Trieste
, Sezione Georisorse e Ambiente, via A. Valerio 10, 34127 Trieste, Italye-mail: piller@units.it
J. Heat Transfer. Jul 2007, 129(7): 769-777 (9 pages)
Published Online: August 5, 2006
Article history
Received:
March 25, 2006
Revised:
August 5, 2006
Citation
Stalio, E., and Piller, M. (August 5, 2006). "Direct Numerical Simulation of Heat Transfer in Converging–Diverging Wavy Channels." ASME. J. Heat Transfer. July 2007; 129(7): 769–777. https://doi.org/10.1115/1.2717235
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