Skip to main content
    • Aa
    • Aa
  • Get access
    Check if you have access via personal or institutional login
  • Cited by 80
  • Cited by
    This article has been cited by the following publications. This list is generated based on data provided by CrossRef.

    van Hout, René 2017. Particles in Wall-Bounded Turbulent Flows: Deposition, Re-Suspension and Agglomeration.

    Asiagbe, Kenneth S. Fairweather, Michael Njobuenwu, Derrick O. and Colombo, Marco 2016. 26th European Symposium on Computer Aided Process Engineering.

    Lee, By Junghan Zhang, Zhuo Baek, Seunghyun Kim, Sangkuk Kim, Donghyung and Yong, Kijung 2016. Bio-inspired dewetted surfaces based on SiC/Si interlocked structures for enhanced-underwater stability and regenerative-drag reduction capability. Scientific Reports, Vol. 6, p. 24653.

    Maryami, R. Javadpoor, M. and Farahat, S. 2016. Experimental investigation of head resistance reduction in bubbly Couette–Taylor flow. Heat and Mass Transfer,

    Pal, Nairita Perlekar, Prasad Gupta, Anupam and Pandit, Rahul 2016. Binary-fluid turbulence: Signatures of multifractal droplet dynamics and dissipation reduction. Physical Review E, Vol. 93, Issue. 6,

    Ma, Jingsen Chahine, Georges L. and Hsiao, Chao-Tsung 2015. Spherical bubble dynamics in a bubbly medium using an Euler–Lagrange model. Chemical Engineering Science, Vol. 128, p. 64.

    Maryami, R. Farahat, S. and Poor, M. J. 2015. The Effect of Small Bubbles on Resistance Reduction of Water Flow in Co-axial Cylinders with an Inner Rotating Cylinder. Journal of The Institution of Engineers (India): Series C, Vol. 96, Issue. 2, p. 193.

    Pang, M. and Wei, J. 2015. A Mechanism on Liquid-Phase Turbulence Modulation by Microbubbles. Advances in Mechanical Engineering, Vol. 6, p. 405864.

    Pang, M. Wei, J. and Yu, B. 2015. Study on Liquid Turbulence Modulation by Microbubbles in Different Turbulence Layers. Advances in Mechanical Engineering, Vol. 6, p. 647467.

    Pang, M. Wei, J. and Yu, B. 2015. Turbulence Modulation by Small Bubbles in the Vertical Upward Channel Flow. Advances in Mechanical Engineering, Vol. 5, p. 379839.

    Jing, Jiaqiang Duan, Nian Dai, Kemin Tan, Jiatong Jing, Peiyu Li, Ye Sun, Jie and Zhou, Yinuo 2014. Investigation on drag characteristics of heavy oil flowing through horizontal pipe under the action of aqueous foam. Journal of Petroleum Science and Engineering, Vol. 124, p. 83.

    Kodama, Yoshiaki and Hinatsu, Munehiko 2014. Micro- and Nanobubbles.

    Maryami, R Farahat, S poor, M Javad and Mayam, M H Shafiei 2014. Bubbly drag reduction in a vertical Couette–Taylor system with superimposed axial flow. Fluid Dynamics Research, Vol. 46, Issue. 5, p. 055504.

    Murai, Yuichi 2014. Frictional drag reduction by bubble injection. Experiments in Fluids, Vol. 55, Issue. 7,

    Neophytou, M. K.-A. Markides, C. N. and Fokaides, P. A. 2014. An experimental study of the flow through and over two dimensional rectangular roughness elements: Deductions for urban boundary layer parameterizations and exchange processes. Physics of Fluids, Vol. 26, Issue. 8, p. 086603.

    OISHI, Yoshihiko MURAI, Yuichi and TASAKA, Yuji 2014. Friction Drag Characteristics in Horizontal Air-Silicone Oil Bubbly Channel Flow. JAPANESE JOURNAL OF MULTIPHASE FLOW, Vol. 28, Issue. 1, p. 71.

    Pang, M.J. Wei, J.J. and Yu, B. 2014. Numerical study on modulation of microbubbles on turbulence frictional drag in a horizontal channel. Ocean Engineering, Vol. 81, p. 58.

    Sirignano, William A. 2014. Advances in droplet array combustion theory and modeling. Progress in Energy and Combustion Science, Vol. 42, p. 54.

    Abdulbari, Hayder A. Yunus, R.M. Abdurahman, N.H. and Charles, A. 2013. Going against the flow—A review of non-additive means of drag reduction. Journal of Industrial and Engineering Chemistry, Vol. 19, Issue. 1, p. 27.

    Nouri, N.M. Yekani Motlagh, S. Navidbakhsh, M. Dalilhaghi, M. and Moltani, A.A. 2013. Bubble effect on pressure drop reduction in upward pipe flow. Experimental Thermal and Fluid Science, Vol. 44, p. 592.

  • Journal of Fluid Mechanics, Volume 503
  • March 2004, pp. 345-355

On the physical mechanisms of drag reduction in a spatially developing turbulent boundary layer laden with microbubbles

  • DOI:
  • Published online: 01 March 2004

The objective of this paper is to explain, in as much detail as possible, the physical mechanisms responsible for the reduction of skin friction in a microbubble-laden spatially developing turbulent boundary layer over a flat plate, for $Re_{\theta} = 1430$. Our DNS results with microbubble volume fraction ranging from $\phi_v = 0.001$ to 0.02 show that the presence of bubbles results in a local positive divergence of the fluid velocity, ${\bm \nabla} \,{\bm \cdot}\,{\bm U} > 0$, creating a positive mean velocity normal to (and away from) the wall which, in turn, reduces the mean streamwise velocity and displaces the quasi-streamwise longitudinal vortical structures away from the wall. This displacement has two main effects: (i) it increases the spanwise gaps between the wall streaks associated with the sweep events and reduces the streamwise velocity in these streaks, thus reducing the skin friction by up to 20.2% for $\phi_v = 0.02$; and (ii) it moves the location of peak Reynolds stress production away from the wall to a zone of a smaller transverse gradient of the mean streamwise velocity (i.e. smaller mean shear), thus reducing the production rate of turbulence kinetic energy and enstrophy.

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
  • URL: /core/journals/journal-of-fluid-mechanics
Please enter your name
Please enter a valid email address
Who would you like to send this to? *