Sökning: "Impinging jet"

Visar resultat 1 - 5 av 27 avhandlingar innehållade orden Impinging jet.

1. 1. Large Eddy Simulation of Impinging Jets

   Författare :Thomas Hällqvist; Laszlo Fuchs; Pierre Sagaut; KTH; []
   Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; 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;

   Sammanfattning : 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. LÄS MER

3. 2. Turbulent jets in confined spaces : application in mixing ventilation: experimental and numerical studies

   Författare :Taghi Karimipanah; Mats Sandberg; H. A. Awbi; Högskolan i Gävle; []
   Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; turbulent; wall jet; impinging jet; free jet; confinement effect; pressure; throw; experimental; numerical; corner; momentum; mixing ventilation;

   Sammanfattning : The basis of mixing ventilation is the airflow supply to the room by means of jets initiatedfrom the ventilation diffusers. To avoid the draught problem, the design of mixing ventilationmakes uses the throw term, which is defined as the distance to the supply air terminal inwhich the jet centreline mean velocity is decreased to a given value. LÄS MER

4. 3. On the numerical modelling of impinging jets heat transfer

   Författare :Mirko Bovo; Chalmers University of Technology; []
   Nyckelord :NATURVETENSKAP; NATURVETENSKAP; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; ENGINEERING AND TECHNOLOGY; heat transfer; Jet; LES; CFD;

   Sammanfattning : This thesis collects two studies on heat transfer in impinging jets and on methods for modeling flows of this kind using CFD. Stationary impinging jets with different nozzle to wall distances (z/D = 2 and 6) and Re (10000, 20000, 23000, 30000) are modeled. Steady-state models capture the important features of heat transfer in these jets. LÄS MER

5. 4. Experimental and numerical investigations of a ventilation strategy – impinging jet ventilation for an office environment

   Författare :Huijuan Chen; Bahram Moshfegh; Mathias Cehlin; Darren Robinson; Linköpings universitet; []
   Nyckelord :Impinging jet ventilation; room air distribution; thermal comfort; ventilation performance; turbulence modelling; CFD;

   Sammanfattning : A well-functioning, energy-efficient ventilation system is of vital importance to offices, not only to provide the kind of comfortable, healthy indoor environment necessary for the well-being and productive work performance of occupants, but also to reduce energy use in buildings and the associated impact of CO2 emissions on the environment. To achieve these goals impinging jet ventilation has been developed as an innovative ventilation concept. LÄS MER

7. 5. Experimental and Numerical Investigation of the Quenching Process on Rotary Hollow Cylinder by Multiple Impinging Jets

   Författare :Mohammad Jahedi; Bahram Moshfegh; Fredrik Berntsson; Joakim Wren; Rahmatollah Khodabandeh; Högskolan i Gävle; []
   Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Multiple jet arrays; Transient boiling; Moving surface; Rotating surface; Inverse heat conduction problem; Quenching; Water impinging jet; Experimental study; Matriser av jetstrålar; Direktverkande jetstrålar; Transient kokning; Roterande yta; Icke-stationär invers värmeledning; Släckning; Experimentell studie; Intelligent industri; Intelligent Industry;

   Sammanfattning : The worldwide competitive market on metal products with higher quality in industry has increased the need to implement more advanced and controllable quenching techniques in the hardening stage of the heat treatment process. Moreover, sustainability and energy efficiency are key factors to consider in the development of advanced quenching techniques. LÄS MER