Three-Dimensional Forced Convection in Plane Symmetric Sudden Expansion
Three-Dimensional Forced Convection in Plane Symmetric Sudden Expansion
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DOI：
10.1115/1.1795242
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发表时间：
2004-10
影响因子：
--
通讯作者：
J. Nie;B. Armaly
中科院分区：
文献类型：
--
作者：
J. Nie;B. Armaly
针对雷诺数，对平面对称突然膨胀中的三维层流强制对流进行了模拟，其中流动是稳定且对称的。在分离剪切层的侧壁附近形成旋转的“喷射状”流，其对阶梯壁的冲击是导致侧壁附近的努塞尔数达到最大值以及在该区域产生反向流的原因。阶梯壁上的最大努塞尔数位于主再循环流区域内，其位置与射流冲击区域不重合。结果表明，阶梯壁上壁剪应力流向分量为零的位置与靠近侧壁的一次再循环流区域的外边缘并不重合。 @DOI：10.1115/1.1795242#
Simulations of three-dimensional laminar forced convection in a plane symmetric sudden expansion are presented for Reynolds numbers where the flow is steady and symmetric. A swirling ‘‘jetlike’’ flow develops near the sidewalls in the separating shear layer, and its impingement on the stepped wall is responsible for the maximum that develops in the Nusselt number adjacent to the sidewalls and for the reverse flow that develops in that region. The maximum Nusselt number on the stepped wall is located inside the primary recirculation flow region and its location does not coincide with the jetlike flow impingement region. The results reveal that the location where the streamwise component of wall shear stress is zero on the stepped walls does not coincide with the outer edge of the primary recirculation flow region near the sidewalls. @DOI: 10.1115/1.1795242#