Numerical study of self-sustained oscillatory flows and heat transfer in channels with a tandem of transverse vortex generators |
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Authors: | Alvaro Valencia |
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Institution: | (1) Universidad de Chile Departamento de Ingeniería Mecánica Casilla 2777 Correo 21, Santiago, Chile, CL |
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Abstract: | A numerical investigation was conducted into channel flows with a tandem of transverse vortex generators in the form of rectangular
cylinders. The oscillatory behavior of the flow is studied. Data for heat transfer and flow losses are presented for 100≤Re≤400
and cylinder separation distances 1≤S/H≤4. The results are obtained by numerical solution of the full Navier-Stokes equations and the energy equation. Self-sustained
flow oscillations are found for Re>100. Alternate and dynamic shedding of large vortex structures from the cylinders is observed
by visualization of the numerically determined flow field. A heat transfer enhancement up to a factor 1.78 compared to plane
channel flow is observed.
Received on 16 July 1997 |
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