Flow temperature and laser-Doppler velocity measurements are presented to understand better the flow and heat transfer behavior resulting from the placement of vortex generators above the first and fifth ribs in a ribbed duct air flow (Re = 3450) and as a benchmark for comparing model predictions. Because the generator–rib spacing, at the smallest spacing (s/h = 0.25), was too small for the flow to pass through it, the generator–rib pair functioned as a single element with an increased effective height, comprising the rib height, the generator–rib space, and the generator proper, which resulted in a downstream shift in the flow reattachment and peak Nusselt number locations. At s/h = 0.75, the flow expanded as it passed through the generator–rib space. Dictated by the upstream flow conditions, the expansion resulted in a vertical downward flow behind the first generator–rib configuration and no vertical downward flow behind the fifth. The vertical downward flow compensated for generator-induced reductions in the near-wall streamwise velocities behind the first generator–rib configuration, resulting in increased local Nusselt numbers, whereas the generator-induced reductions in the streamwise velocities in the absence of the vertical downward flow gave way to reduced Nusselt numbers behind the fifth generator–rib configuration.
The Effect of Placing Vortex Generators Above Ribs in Ribbed Ducts on the Flow, Flow Temperature, and Heat Transfer Behavior
- Views Icon Views
- Share Icon Share
- Search Site
Myrum, T. A., Acharya, S., Sinha, S., and Qui, X. (May 1, 1996). "The Effect of Placing Vortex Generators Above Ribs in Ribbed Ducts on the Flow, Flow Temperature, and Heat Transfer Behavior." ASME. J. Heat Transfer. May 1996; 118(2): 294–300. https://doi.org/10.1115/1.2825844
Download citation file: