Unique Behaviors of a Backward-Facingstep Flow at Microscale

The effect of nanofluids flow on mixed convection heat transfer over microscale backward-facing step

“…Even though it has a very simple geometry, the flow over a backward facing step demonstrates the most important flow structures concerning with the separation and reattached flow [21]. Very little studies have considered in their investigations the fluid flow characteristics and the thermal behavior over microscale backward-facing step such as Hsieh et al [22] and Xue et al [23,24].…”

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

“…The results of MBFS of Xue et al [48] revealed that at Knudsen number (Kn = 0.01), there was nonlinear distributions of pressure were observed before and after the step, and a significant pressure drop takes place at the step. The vertical distribution of the velocity in different cross sections along the channel showed that there was a significant drop of vertical velocity near the step can be observed due to the sudden expansion of the gas flow.…”

Thermal Rarefied Gas Flow Investigations Through Micro-/Nano-Backward-Facing Step: Comparison of DSMC and CFD Subject to Hybrid Slip and Jump Boundary Conditions

“…This is caused by the increase of the wall temperature that affects significantly the computation of the values and in Eqs. (9) and (10), respectively. Surface pressures also increase along the wall-3 when T w increases.…”

“…The compressibility had significant effect on flow characteristics in the slip regime but would be negated by the rarefaction in the transition flow regime [8]. Xue et al [9] figured out that the stability of the vortex behind the step relies on the magnitudes of mean and thermal velocities in the region, which are closely related to the Kn number, local temperature, and driving pressure ratio. A highly intensified pressure and velocity region behind the step is identified in the transition flow regime [9].…”

“…Xue et al [9] figured out that the stability of the vortex behind the step relies on the magnitudes of mean and thermal velocities in the region, which are closely related to the Kn number, local temperature, and driving pressure ratio. A highly intensified pressure and velocity region behind the step is identified in the transition flow regime [9]. Kursun [13][14][15][16][17][18] and dsmcFoamStrath [19][20] developed in the framework of open source CFD toolbox, OpenFOAM [21].…”