Transition phenomena and velocity distribution in constant-deceleration pipe flow

    Authors

    H. Saka; Y. Ueda; K. Nishihara; O. J. Ilegbusi;M. Iguchi

    Comments

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    Abbreviated Journal Title

    Exp. Therm. Fluid Sci.

    Keywords

    Unsteady flow; Pipe flow; Constant-deceleration flow; Turbulence; transition; TURBULENCE; IDENTIFICATION; LAMINAR; REST; Thermodynamics; Engineering, Mechanical; Physics, Fluids & Plasmas

    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. (C) 2014 Elsevier Inc. All rights reserved.

    Journal Title

    Experimental Thermal and Fluid Science

    Volume

    62

    Publication Date

    1-1-2015

    Document Type

    Article

    Language

    English

    First Page

    175

    Last Page

    182

    WOS Identifier

    WOS:000350074100018

    ISSN

    0894-1777

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