Search for dissertations about: "Low Reynolds number jet"

Showing result 1 - 5 of 23 swedish dissertations containing the words Low Reynolds number jet.

2. 1. Near-Field Study of Multiple Interacting Jets : Confluent Jets

   Author : Shahriar Ghahremanian; Bahram Moshfegh; Linköpings universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Multiple interacting jets; confluent jets; axisymmetric round jet; Low Reynolds number jet; Particle Image Velocimetry PIV ; Laser Doppler Anemometry LDA ; Hot-Wire anemometry HWA ; RANS turbulence models; SST ? − ?; Low Reynolds ? − ?; Response Surface Method;

   Abstract : This thesis deals with the near-field of confluent jets, which can be of interest in many engineering applications such as design of a ventilation supply device. The physical effect of interaction between multiple closely spaced jets is studied using experimental and numerical methods. READ MORE

4. 2. Turbulence Measurements in a Natural Convection Boundary Layer and a Swirling Jet

   Author : Abolfazl Shiri; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; swirl; constant current bridge; high Rayleigh number; natural convection; Jet; cold-wire thermometry; vertical cylinder; laser Doppler anemometry; turbulent boundary layers;

   Abstract : Two sets of experimental measurement were carried out on an axisymmetric swirling jet flow and a natural convection boundary layer. In the first experiment, the far field of an incompressible swirling jet, discharged into a quiescent ambient has been studied using laser Doppler anemometry. READ MORE

5. 3. Large Eddy Simulation of Impinging Jets

   Author : Thomas Hällqvist; Laszlo Fuchs; Pierre Sagaut; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Impinging jet; large eddy simulation; heat transfer; vortex formation; circular jet; forcing; inflow conditions; implicit modeling.; Fluid mechanics; Strömningsmekanik;

   Abstract : This thesis deals with Large Eddy Simulation (LES) of impinging air jets. The impinging jet configuration features heated circular jets impinging onto a flat plate. The problem addressed here is of generic nature, with applications in many engineering devices, such as cooling of components in gas turbines, in cars and electronic devices. READ MORE

6. 4. Experimental and Numerical Investigations of Confluent Round Jets

   Author : Klas Svensson; Bahram Moshfegh; Patrik Rohdin; Bengt Sundén; Linköpings universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Confluent jets; Multiple jet array; Jet interactions; Confluent Core Zone CCZ ; Particle Image Velocimetry PIV ; Laser Doppler Velocimetry LDA ; Computational Fluid Dynamics CFD ; Response Surface Methodology;

   Abstract : Unconfined multiple interacting confluent round jets are interesting from a purely scientific point of view, as interaction between neighboring jets brings additional complexity to the flow field. Unconfined confluent round jets also exist in various engineering applications, such as ventilation supply devices, sewage disposal systems, combustion burners, chemical mixing or chimney stacks. READ MORE

7. 5. Robust Numerical Wall Functions Implemented in OpenFOAM

   Author : Jon-Anders Bäckar; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; impinging jet; numerical wall function; Computational Fluid Dynamics; speed-up; OpenFOAM;

   Abstract : This thesis presents two new numerical wall models for computing Reynolds-Averaged-Navier-Stokes (RANS) equations with low-Reynolds-number turbulence models. Theobjective is to considerably reduce the total central processing unit (CPU) cost of thenumerical simulations of wall bounded flows while maintaining the accuracy of anylow-Reynolds-number turbulence model. READ MORE