TY - GEN
T1 - SIMULATIONS OF THREE-DIMENSIONAL FLOW AND AUGMENTED HEAT TRANSFER IN A SYMMETRICALLY GROOVED CHANNEL WITH CONSTANT TEMPERATURE WALLS
AU - Greiner, M.
AU - Faulkner, R. J.
AU - Wirtz, R. A.
AU - Fischer, P. F.
N1 - Funding Information:
National Science Foundation Grant CTS-9501502 supports this work. The work of P.F. Fischer is supported in part by NSF Grant ASC-9405403. The California Institute of Technology provides time on the Intel Delta under NSF Cooperative Agreement CCR-8809616.
Publisher Copyright:
© 1997 American Society of Mechanical Engineers (ASME). All rights reserved.
PY - 1997
Y1 - 1997
N2 - Direct numerical simulations of three-dimensional flow and augmented convection in a channel with symmetric, transverse grooves on two opposite walls are performed using the spectral element technique. The flow is driven by a constant pressure gradient. A method employing an exponentially decaying temperature scale is developed and used to calculate the fully developed heat transfer coefficient for constant temperature boundary conditions. Results are presented for the Reynolds number range 180 < Re < 1175. A series of flow transitions is observed as the Reynolds number is increased, from steady two-dimensional flow, to traveling two and three-dimensional wave structures, and finally to three-dimensional mixing. Periodic ejection of slow moving fluid from the grooves causes significant flow rate unsteadiness. Three-dimensional simulations predict friction factor and Nusselt number values to within 20% of measured values over the narrow Reynolds number range where overlapping data exists. Two-dimensional simulations are found to be inadequate to calculate transport in this channel for Re > 400.
AB - Direct numerical simulations of three-dimensional flow and augmented convection in a channel with symmetric, transverse grooves on two opposite walls are performed using the spectral element technique. The flow is driven by a constant pressure gradient. A method employing an exponentially decaying temperature scale is developed and used to calculate the fully developed heat transfer coefficient for constant temperature boundary conditions. Results are presented for the Reynolds number range 180 < Re < 1175. A series of flow transitions is observed as the Reynolds number is increased, from steady two-dimensional flow, to traveling two and three-dimensional wave structures, and finally to three-dimensional mixing. Periodic ejection of slow moving fluid from the grooves causes significant flow rate unsteadiness. Three-dimensional simulations predict friction factor and Nusselt number values to within 20% of measured values over the narrow Reynolds number range where overlapping data exists. Two-dimensional simulations are found to be inadequate to calculate transport in this channel for Re > 400.
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U2 - 10.1115/IMECE1997-0918
DO - 10.1115/IMECE1997-0918
M3 - Conference contribution
AN - SCOPUS:3643073549
T3 - ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
SP - 269
EP - 276
BT - Heat Transfer
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 1997 International Mechanical Engineering Congress and Exposition, IMECE 1997 - Heat Transfer
Y2 - 16 November 1997 through 21 November 1997
ER -