Title

Transition Phenomena And Velocity Distribution In Constant-Deceleration Pipe Flow

Keywords

Constant-deceleration flow; Pipe flow; Turbulence transition; Unsteady flow

Abstract

The critical Reynolds number for transition to turbulence in a constant-acceleration pipe flow is well known to be significantly higher than the value for steady pipe flow. This is a consequence of the significant suppression of amplification of disturbances entering the pipe by the acceleration in spite of the increase of inertial force due to increase in instantaneous Reynolds number. In contrast, relatively little is known of the transition phenomena in a constant-deceleration pipe flow. Such a flow system is investigated by an experimental method in which the cross-sectional mean velocity is initially kept constant and subsequently decreased linearly to zero. The characteristics of the transition phenomena will be determined by two factors - deceleration and viscosity. Deceleration will amplify the disturbances, while a decrease in the instantaneous Reynolds number is expected to suppress the amplification of the disturbances due to viscosity. The study uses hot-wire experiments to clarify which of the two effects predominates in constant-deceleration pipe flow.

Publication Date

4-1-2015

Publication Title

Experimental Thermal and Fluid Science

Volume

62

Number of Pages

175-182

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.expthermflusci.2014.12.010

Socpus ID

84921327560 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84921327560

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