Abstract： A twodimensional incompressible and unsteady numerical model of the backwardfacing step was established for transitional flow. The influences of outlet height on time averaged Nusselt number (Num), distributions of flow field and temperature field, flow and heat transfer parameters near wall were also investigated. The results show that when outlet height is reduced, the Num near the main peak position is enhanced with obvious bimodal phenomenon. When outlet height is increased, the Num downstream the main peak position is raised with widen space between main and minor peak. The smaller the outlet height is, the more intense the interaction between positive vortex and negative vortex is, and the convective heat transfer between cold fluid and thermal fluid is strengthened with increased Num. The temperature gradient on the downstream bottom wall is decreased with decreased Num. The Num main peak position and the location for the surface friction coefficient of zero are not always overlapped. The distribution of Num is affected by the fluctuation level of normal velocity component and temperature over time.
仲敏波, 王丽娟, 喜冠南, 袁银男. 出口高度对过渡流态后向台阶传热特性的影响[J]. 江苏大学学报（自然科学版）, 2015, 36(6): 655-660.
ZHONG Min-Bo, WANG Li-Juan, XI Guan-南, YUAN Yin-Nan. Influence of outlet height on heat transfer characteristics
for transitional flow over a backwardfacing step[J]. Journal of Jiangsu University(Natural Science Eidtion)
, 2015, 36(6): 655-660.
2015, Vol. 36 
