Approximate wall shear equation for unsteady laminar pipe flows
作者:
E.B. Shuy,
期刊:
Journal of Hydraulic Research
(Taylor Available online 1995)
卷期:
Volume 33,
issue 4
页码: 457-469
ISSN:0022-1686
年代: 1995
DOI:10.1080/00221689509498655
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
An approximate equation is derived for wall shear stress in unsteady laminar pipe flows in terms of the instantaneous section mean velocity and acceleration. The equation, which is exact for a constantly accelerating or decelerating flow, is applied to solve for two types of pressure gradient functions, a transient start-up flow and a linearly reversing pressure gradient. Comparison with exact analytical solutions verifies that the equation is adequate for the two types of transient flows investigated, and for low frequency oscillating flows.
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