Experimental investigation is carried out on the transition to turbulence in a transient circular pipe flow. The flow is accelerated from rest at a constant acceleration until its cross-sectional mean velocity reaches a constant value. Accordingly, the history of the flow thus generated consists of the initial stage of constant acceleration and the following stage of constant cross-sectional mean velocity. The final Reynolds number based on the constant cross-sectional mean velocity and the pipe diameter is chosen to be much greater than the transition Reynolds number of a steady pipe flow of about 3000. The transition to turbulence is judged from the output signal of the axial velocity component and its root-mean-square value measured with a hot-wire anemometer. A turbulent slug appears after the cross-sectional mean velocity of the flow reaches the predetermined constant value under every experimental condition. Turbulence production therefore is suppressed, while the flow is accelerated. The time lag for the appearance of the turbulent slug after the cross-sectional mean velocity of the flow reaches the constant value decreases with an increase in the constant acceleration value. An empirical equation is proposed for estimating the time lag. The propagation velocity of the leading edge of the turbulent slug is independent of the constant acceleration value under the present experimental conditions.
Skip Nav Destination
Article navigation
November 2010
Research Papers
Effect of Initial Constant Acceleration on the Transition to Turbulence in Transient Circular Pipe Flow
Manabu Iguchi,
Manabu Iguchi
Division of Materials Science and Engineering, Graduate School of Engineering,
Hokkaido University
, North 13, West 8, Kita-ku, Sapporo 060-8628, Japan
Search for other works by this author on:
Kazuyoshi Nishihara,
Kazuyoshi Nishihara
Graduate School of Engineering,
Osaka Electro-Communication University
, 18-8 Hatsu-cho, Neyagawa, Osaka 572-8630, Japan
Search for other works by this author on:
Yusuke Nakahata,
Yusuke Nakahata
Division of Materials Science and Engineering, Graduate School of Engineering,
Hokkaido University
, North 13, West 8, Kita-ku, Sapporo 060-8628, Japan
Search for other works by this author on:
Charles W. Knisely
Charles W. Knisely
Department of Mechanical Engineering,
Bucknell University
, Lewisburg, PA 17837
Search for other works by this author on:
Manabu Iguchi
Division of Materials Science and Engineering, Graduate School of Engineering,
Hokkaido University
, North 13, West 8, Kita-ku, Sapporo 060-8628, Japan
Kazuyoshi Nishihara
Graduate School of Engineering,
Osaka Electro-Communication University
, 18-8 Hatsu-cho, Neyagawa, Osaka 572-8630, Japan
Yusuke Nakahata
Division of Materials Science and Engineering, Graduate School of Engineering,
Hokkaido University
, North 13, West 8, Kita-ku, Sapporo 060-8628, Japan
Charles W. Knisely
Department of Mechanical Engineering,
Bucknell University
, Lewisburg, PA 17837J. Fluids Eng. Nov 2010, 132(11): 111203 (9 pages)
Published Online: November 9, 2010
Article history
Received:
March 26, 2010
Revised:
August 31, 2010
Online:
November 9, 2010
Published:
November 9, 2010
Citation
Iguchi, M., Nishihara, K., Nakahata, Y., and Knisely, C. W. (November 9, 2010). "Effect of Initial Constant Acceleration on the Transition to Turbulence in Transient Circular Pipe Flow." ASME. J. Fluids Eng. November 2010; 132(11): 111203. https://doi.org/10.1115/1.4002519
Download citation file:
Get Email Alerts
Cited By
Detached Eddy Simulation of Micro-Vortex Generators Mounted on NACA 4412 Airfoil
J. Fluids Eng (June 2025)
Experimental Investigation of the Effect of Rake on a Bluff Body Equipped With a Diffuser
J. Fluids Eng (April 2025)
Related Articles
Transition to Turbulence in Accelerating Pipe Flow
J. Fluids Eng (July,2011)
Investigations of Tripping Effect on the Friction Factor in Turbulent Pipe Flows
J. Fluids Eng (July,2009)
Rapid Transition to Turbulence in Pipe Flows Accelerated From Rest
J. Fluids Eng (November,2003)
Linear Instability of Entry Flow in a Pipe
J. Fluids Eng (October,2007)
Related Proceedings Papers
Related Chapters
Heat Generated in Pipe Flows Due to Friction
Everyday Heat Transfer Problems: Sensitivities to Governing Variables
Neural Network and Genetic Programming in Pressure Loss Estimation in Eccentric Pipe Flow
Intelligent Engineering Systems through Artificial Neural Networks Volume 18
Cavitating Structures at Inception in Turbulent Shear Flow
Proceedings of the 10th International Symposium on Cavitation (CAV2018)