Measurements and calculations of rough-wall heat transfer in the turbulent boundary layer
Measurements and calculations of rough-wall heat transfer in the turbulent boundary layer
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DOI：
10.1016/0017-9310(91)90017-9
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发表时间：
1991-04
影响因子：
5.2
通讯作者：
M. Hosni;H. Coleman;R. Taylor
中科院分区：
文献类型：
--
作者：
M. Hosni;H. Coleman;R. Taylor
给出了气动光滑、过渡粗糙和完全粗糙的四种表面--三种粗糙和一种光滑的湍流边界层流动的实验斯坦顿数结果。粗糙表面由直径1.27 mm的半球组成，在其他光滑的墙上，它们以交错排列的方式分别隔开2、4和10个基径。斯坦顿数数据是关于压力梯度为10000的不可压缩湍流边界层空气流动的。将这些数据与以前在另一种类似粗糙表面上发表的结果进行了比较，结果表明，基于该单一粗糙表面数据的一些关于传热行为的结论不适用于这些新的表面几何形状。文中还提出了一种改进的粗糙度单元能量输运模型，用于以前发表的离散单元预测方法。在恒压和加速流动两种情况下，将计算结果与四种粗糙面的计算结果进行了比较，结果表明，计算结果与实验数据吻合较好。
Experimental Stanton number results from aerodynamically smooth, transitionally rough, and fully rough turbulent boundary layer flows are presented for four surfaces—three rough and one smooth. The rough surfaces are composed of 1.27 mm diameter hemispheres spaced in staggered arrays 2, 4, and 10 base diameters apart, respectively, on otherwise smooth walls. Stanton number data are reported for zero pressure gradient incompressible turbulent boundary layer air flows which giveRexup to 10000 000. These data are compared with previously published results on another, similar rough surface, and it is shown that some conclusions about heat transfer behavior based on data from that single rough surface do not extend to these new surface geometries. A refined roughness element energy transport model for use in the previously published discrete element prediction method is also presented. Calculations are compared with data from the four rough surfaces with well-defined roughness elements for both constant pressure and accelerated flow cases, and it is shown that the predictions are in excellent agreement with the data.