Direct Numerical Simulation of Heat Transfer in Converging–Diverging Wavy Channels
- 5 August 2006
- journal article
- Published by ASME International in Journal of Heat Transfer
- Vol. 129 (7), 769-777
- https://doi.org/10.1115/1.2717235
Abstract
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 Re=481 and Re=872 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.Keywords
This publication has 16 references indexed in Scilit:
- NUMERICAL STUDY OF HEAT AND MOMENTUM TRANSFER IN CHANNELS WITH WAVY WALLSNumerical Heat Transfer, Part A: Applications, 2005
- FULLY DEVELOPED FLOW STRUCTURES AND HEAT TRANSFER IN SINE-SHAPED WAVY CHANNELSInternational Communications in Heat and Mass Transfer, 2004
- Numerical analysis of fluid flow and heat transfer in periodic wavy channelsInternational Journal of Heat and Fluid Flow, 2001
- An experimental study of flow and heat transfer in sinusoidal wavy passagesInternational Journal of Heat and Mass Transfer, 1999
- Calculation of turbulent flow andheat transfer in periodicallyconverging–diverging channelsComputers & Fluids, 1998
- Dynamical flow characterization of transitional and chaotic regimes in converging–diverging channelsJournal of Fluid Mechanics, 1996
- Convective heat transfer in periodic wavy passagesInternational Journal of Heat and Mass Transfer, 1995
- Transition to chaos in converging–diverging channel flows: Ruelle–Takens–Newhouse scenarioPhysics of Fluids, 1994
- Flow observations and mass transfer characteristics in symmetrical wavy-walled channels at moderate Reynolds numbers for steady flowInternational Journal of Heat and Mass Transfer, 1990
- Heat/Mass Transfer Characteristics for Flow in a Corrugated Wall ChannelJournal of Heat Transfer, 1977