Highly Turbulent Taylor-Couette Flow

Research output: ThesisPhD Thesis - Research UT, graduation UT

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Abstract

The research issues addressed in this mostly experimental thesis concern highly turbulent Taylor-Couette (TC) flow (Re>105, implying Ta>1011). We study it on a fundamental level to aid our understanding of (TC) turbulence and to make predictions towards astrophysical disks, and at a practical level as applications can be found in bubble-induced skin-friction drag reduction on ships. In PART I we introduce the new TC facility of our Physics of Fluids group, called the Twente turbulent Taylor-Couette (T3C) facility. It features two independently rotating cylinders of variable radius ratio with accurate rotation rate and temperature control, torque sensing, bubble injection and it is equipped with several local sensors. It is able to reach Reynolds numbers up to 3:4�106. In PART II we focus on highly turbulent single-phase TC flow. We measure the global torque as a function of the driving parameters and we provide local angular velocity measurements. The results are interpreted as the transport of angular velocity, based on the model proposed by Eckhardt, Grossmann & Lohse (2007). Furthermore, we study the turbulence transport in quasi-Keplerian profiles, mimicking astrophysical disks. In PART III we study the effect of bubbles on highly turbulent TC flow, focusing not only on global drag reduction, but also on the local bubble distribution and angular velocity profiles. We find that drag reduction is a boundary layer effect and that the deformability of bubbles is crucial for strong drag reduction in bubbly turbulent TC flow.
Original languageEnglish
Awarding Institution
  • University of Twente
Supervisors/Advisors
  • Lohse, Detlef , Supervisor
  • Sun, Chao , Advisor
Award date16 Dec 2011
Place of PublicationEnschede
Publisher
Print ISBNs9789036532723
DOIs
Publication statusPublished - 16 Dec 2011

Keywords

  • METIS-281263
  • IR-79025

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