Flow in Channels With Rough Walls-Old and New Concepts

被引：10

作者：

Herwig, H. ^{[1
]}

Gloss, D. ^{[1
]}

Wenterodt, T. ^{[1
]}

机构：

[1] Hamburg Univ Technol, Inst Thermofluid Dynam, D-21073 Hamburg, Germany

来源：

HEAT TRANSFER ENGINEERING | 2010年 / 31卷 / 08期

关键词：

HEAT-TRANSFER;

D O I：

10.1080/01457630903466605

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

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.

引用

页码：658 / 665

页数：8

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