摘要：Flow regimes in various cha nnels can introduce different responses that intera ct with inside of channel walls. He nce both flow characteristic and its effect on wall surfaces should be investiga ted, especially for a new channel design or usage of a new fluid. In this work, flow characteristics of a nanofluid flow and wall stress conc entration locations are investiga ted numerically in a 3D cha nnel with including sharp edge rectangular ribs. The ribs are a rranged with periodic order a nd transverse positions at inside of upper and below surfaces of channel. The nanofluid flow consists of Al 2 O 3 -water solution with %8 particle volume concentrations. The used Reynolds numbe r (Re) cha nges from 75 to 2000. Furthermore, commonly used two different fluids are investigated for detecting differenc es of flow characteristics of nanofluid. Tresca yie ld criterion is used with c onsidering channel's duc tile material properties in stress analysis. Interactions between ribs and flow are observed in detail. Flow separation and vortex formations effectively de pend on Reynolds number. Values of wall stress concentrations depend on Reynolds number and pressure effects with respect to sharp edge rectangular ribs. Stress values of uppe r surfaces are less than along path of below surfaces on channel wall surfaces.
