Turbulent mixed convection flow over a backward-facing step––the effect of the step heights

Turbulent mixed convection flow over a forward-facing step—the effect of step heights

“…Also, it can be seen from the figure that the magnitude of the negative transverse velocity component in the flow region near the heated downstream wall decreases as the streamwise distance increases downstream from the step, indicating that the effect of the forward-facing step somewhat diminishes as the streamwise distance increases downstream from the step. This behavior is similar to that of the effect of backwardfacing step on turbulent mixed convection flow along a vertical flat plate reported by Abu-Mulaweh et al [7]. The uncertainty in the measured values for V is ±4%.…”

“…The problem of turbulent flow over backward-facing step geometry in natural, forced, and mixed convection has been examined rather extensively in the past (see, for example, Vogel and Eaton [1], Abe et al [2], Rhee and Sung [3], Inagaki [4], and Abu-Mulaweh et al [5][6][7] and the references therein). On the other hand, the problem of turbulent flow over a forward-facing step has received very little attention.…”

Heat transfer and fluid flow over microscale backward and forward facing step: A review

“…An increase in the inclination angle led to increase in the location of the maximum Nusselt number and the reattachment length due to a decrease in the stream wise buoyancy force. Continuously, the experimental results of Abu-Mulaweh et al [14] focused on the effect of the backward-facing step heights on turbulent mixed convection flow along a vertical flat plate. It was observed that the length of the recirculation region extended with increasing step height.…”

Numerical and experimental investigation of shellside characteristics for RODbaffle heat exchanger

“…From the knowledge of fluid dynamics and heat transfer, it is known that the turbulence intensity is a variable that reflects the pulsating degree of flow. The increase of heat transfer always comes with augmentation of turbulence intensity [15,18]. And usually where the turbulence intensity is higher, the heat transfer is better.…”