Search for dissertations about: "Skin-Friction Drag"

Found 4 swedish dissertations containing the words Skin-Friction Drag.

  1. 1. Flow over rough surfaces, and conjugate heat transfer, in engineering applications

    University dissertation from Gothenburg : Chalmers tekniska högskola

    Author : Bercelay Niebles Atencio; [2018]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Skin-Friction Drag; Naphthalene Sublimation Tecnhique; correlation; RANS; Rotating Disk; stator channel; CFD; convective heat transfer; Antifouling paint; electric generator; Impinging Jet; Ship Hull; Roughness Function;

    Abstract : This thesis focuses on two important topics in the field of fluid mechanics and heat transfer that were treated separately. On the one hand, the flow over rough surfaces, which is not yet completely understood, despite of the fact that it has an important implication in many engineering applications, especially in the naval industry for ships and boats because the friction drag caused by fouling, antifouling coatings and roughness in general impacts the fuel consumption and toxic emissions to the atmosphere. READ MORE

  2. 2. Numerical studies on flows with secondary motion

    University dissertation from Stockholm : Kungliga Tekniska högskolan

    Author : Jacopo Canton; KTH.; [2016]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; nonlinear dynamical systems; instability; bifurcation; flow control; skin-friction reduction; Teknisk mekanik; Engineering Mechanics;

    Abstract : This work is concerned with the study of flow stability and turbulence control - two old but still open problems of fluid mechanics. The topics are distinct and are (currently) approached from different directions and with different strategies. READ MORE

  3. 3. Attenuation of boundary layer disturbances by means of streamwise vortices

    University dissertation from Stockholm : KTH Royal Institute of Technology

    Author : Sohrab Sattarzadeh Shirvan; KTH.; [2013]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; boundary layer stability; Tollmien-Schlichting waves; oblique waves; transition to turbulence; streamwise vortices; miniature vortex generators; instability control; drag reduction;

    Abstract : The stability of the boundary layer developed on a flat plate is studied in the presence of streamwise streaks where disturbances of different types are introduced in the wall-bounded shear layer. The experimental investigations are aimed at flow control by means of passively damping the energy growth of the disturbances in the streaky boundary layer and furthermore delay the onset of the transition in the streamwise direction. READ MORE

  4. 4. Boundary layer streaks as a novel laminar flow control method

    University dissertation from Stockholm : KTH Royal Institute of Technology

    Author : Sohrab Sattarzadeh Shirvan; KTH.; [2016]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; boundary layer stability; laminar to turbulent transition; laminar flow control; drag reduction; Tollmien-Schlichting waves; oblique waves; streaky boundary layers; miniature vortex generators; discrete suction;

    Abstract : A novel laminar flow control based on generation of spanwise mean velocity gradients (SVG) in a flat plate boundary layer is investigated where disturbances of different types are introduced in the wall-bounded shear layer. The experimental investigations are aimed at; (i) generating stable and steady streamwise streaks in the boundary layer which set up spanwise gradients in the mean flow, and (ii) attenuating disturbance energy growth in the streaky boundary layers and hence delaying the onset of turbulence transition. READ MORE