摘要
通过对流动中熵产的数值计算,研究了管道和平面通道内流动中粗糙壁面对摩擦的影响.研究表明,在层流流动中壁面粗糙度的影响也是值得重视的,尽管这种效应以往常常被人们所忽视.除了可得到摩擦因子之外,由于可以得知流场中壁面粗糙单元附近的耗散分布,因此可深入理解这一物理现象的本质.为了对粗糙壁面通道内的流动进行简明的描述,需要对壁面位置和粗糙度参数进行合理的选择,并对各种选择方案进行了讨论和评价.
In our study we determine the influence of wall roughness on friction for pipe and channel flows by numerically calculating the entropy production in the flow. It turns out, that there is an appreciable influence of wall roughness in laminar flows though this effect often is neglected completely. In addition to the friction factor results we gain an understanding of the physics since we have access to the dissipation distribution in the flow field close to the roughness elements. For a concise description of flows over rough walls there should be a reasonable choice of the wall location as well as the roughness parameter. Various options are discussed and assessed.
出处
《中国计量学院学报》
2008年第4期296-303,共8页
Journal of China Jiliang University
关键词
粗糙壁面
流动
熵产
耗散模型
rough wall
flow
entropy production
dissipation model
