Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 10 of 10 for “"Axisymmetric jets"”.
-
Spray generation
… generated at the free surface of liquid wall jets and liquid axisymmetric jets flowing over sand and polystyrene (beads) roughed surfaces. Experiments were conducted with freshwater and Eulerian and Lagrangian methods of description were used in the analysis. Measurements were made with three …
-
Turbulent Molecular Mixing in Gaseous Free Shear Flows
… Vortex mixing in the near field of an axisymmetric jet (ReD = 2300) is studied by using an acoustic pulse to obtain repeatable vortex formation and merging events. Results indicate that the mixing process is initially slow within the laminar vortex rollers, but a dramatic increase in …
-
Measurements of the length of the zone of flow establishment in a jet using a Laser Doppler Anemometer
… in a submerged, turbulent, buoyant, axisymmetric jet issuing into a quiescent ambient fluid was investigated using a Laser Doppler Anemometer and microthermocouple probe. Also, velocity and temperature profiles were measured through various cross-sections of the jet; A 3-dimensional …
-
Computation of Reynolds stresses in axisymmetric vortices and jets using a second order closure model
… of equations are then solved for the decay of axisymmetric vortices and jets. A self-similar solution to the axisymmetric vortices is obtained numerically. The characteristics of the mean flow variables as well as the Reynolds stresses in this solution are discussed. Comparisons of the current …
-
Experimental investigation of noise reduction in supersonic jets due to jet rotation and to nozzle geometry changes
… methods used for noise reduction in supersonic jets. The first method employed consisted of a swirl chamber, which produced axisymmetric jets with a tangential velocity component. This component was found to affect the structure of the jet cell and the internal oblique shocks formed inside. In …
-
Jet impingement on porous surfaces
… from the normal impingement of planar and axisymmetric jets onto a porous surface. Six different porous surfaces with open area ratios of 23, 26, 31, 37, 44 and 54% (? = 0.23, 0.26, 0.31, 0.37, 0.44 and 0.54) were placed in low speed (usually 40m/s exit velocity) air jets sufficiently far …
-
Quantitative Acetone PLIF Measurements of Jet Mixing with Synthetic Jet Actuators
Fuel-air mixing enhancement in axisymmetric jets using an array of synthetic jet actuators around the perimeter of the flows (primarily parallel to the flow axis) was investigated using planar laser-induced fluorescence of acetone. The synthetic jets are a promising new mixing control and …
-
Large Eddy Simulation of Supersonic Twin-Jet Impingement Using a Fifth-Order WENO Scheme
… The numerical model consists of two parallel axisymmetric jets of diameter 𝐷*, 3𝐷* apart, issuing from a plane which is at a distance H*=4𝐷* above the ground. The jet diameter 𝐷*, mean velocity 𝑊ₒ*, mean density 𝜌ₒ* and mean temperature 𝑇ₒ* at the jet center in the exit plane are used as …
-
Μελέτη διατάξεων σταδιακής καύσης : αλληλεπίδραση παράλληλων αξονοσυμμετρικών δεσμών με διαφορετικούς αριθμούς Reynolds
Η διδακτορική διατριβή με τίτλο «Μελέτη Διατάξεων Σταδιακής Καύσης» έχει ως αντικείμενο την περιγραφή και την ανάλυση του ροϊκού πεδίου της αλληλεπίδρασης αξονοσυμμετρικών δεσμών διαφορετικού αριθμού Reynolds. Ο έλεγχος των μηχανισμών που διέπουν το ροϊκό αυτό πεδίο είναι σημαντικό εργαλείο για την …