Experimental investigation on the flow characteristics of three-dimensional turbulent offset jets

Simple item page
dc.contributor.authorNyantekyi-Kwakye, Baafour
dc.contributor.examiningcommitteeDavid Kuhn (Mechanical Engineering Department) Tricia Stadnyk (Civil Engineering Department) Kamran Siddiqui (University of Western Ontario)en_US
dc.contributor.supervisorMark F. Tachie (Mechanical Engineering Department) Shawn P. Clark (Civil Engineering Department)en_US
dc.date.accessioned2016-09-02T14:46:54Z
dc.date.available2016-09-02T14:46:54Z
dc.date.issued2015-05-08en_US
dc.date.issued2015-12-24en_US
dc.date.issued2016-07-04en_US
dc.date.issued2016-08-26en_US
dc.degree.disciplineMechanical Engineeringen_US
dc.degree.levelDoctor of Philosophy (Ph.D.)en_US
dc.description.abstractAn experimental study was designed to investigate the effect of different parameters on the development and structure of turbulent 3D offset jets. The present investigation considered the effects of offset height ratio, expansion ratio, surface roughness and rib placement on the flow dynamics of a turbulent 3D offset jet. The velocity measurements were performed using an acoustic Doppler velocimetry (ADV) and particle image velocimetry (PIV). Measurements were conducted within the symmetry and lateral planes. For the PIV technique, the measurements in the symmetry and lateral planes were conducted over a streamwise range of 0 ≤ x/bo ≤ 80 and 12 ≤ x/bo ≤ 60, respectively (where bo is the nozzle height). Likewise, velocity measurements using the ADV technique were conducted over a range of 4 ≤ x/bo ≤ 45 in both the symmetry and lateral planes. The velocity measurements were analyzed using both one-point and multi-point statistics. The one-point statistics included profiles of the mean velocities, Reynolds stresses and some of the budget terms in the turbulent kinetic energy transport equation. The quadrant analysis technique was used to investigate the dominant events that contribute towards the Reynolds shear stress. The two-point correlation analysis was used to investigate how the turbulence quantities are correlated. Information obtained from the two-point correlation analysis was also used to investigate the inclination of vortical structures within the inner and outer shear layers of the 3D offset jet. The direction of the positive mean shear gradient played an active role in the inclination of these vortical structures within the inner and outer shear layers. The reattachment process resulted in the breakdown of these structures within the developing region. Similarly, various length scales were estimated from these structures. The proper orthogonal decomposition was used to examine the distribution of the turbulent kinetic energy within the offset jet flow. Also, the dynamic role of the large scale structures towards the turbulent intensities, turbulent kinetic energy and Reynolds shear stress was investigated.en_US
dc.description.noteOctober 2016en_US
dc.identifier.citationFlow characteristics within the recirculation region of three-dimensional turbulent offset jet Nyantekyi-Kwakye, B., Clark, S. P., Tachie, M. F., Malenchak, J., & Muluye, G. (2015). Flow characteristics within the recirculation region of three-dimensional turbulent offset jet. Journal of Hydraulic Research, 53(2), 230-242.en_US
dc.identifier.citationExperimental study of the flow structures of 3D turbulent offset jets Nyantekyi-Kwakye, B., Tachie, M. F., Clark, S. P., Malenchak, J., & Muluye, G. Y. (2015). Experimental study of the flow structures of 3D turbulent offset jets. Journal of Hydraulic Research, 53(6), 773-786.en_US
dc.identifier.citationFlow Characteristics of an Offset Jet over a Surface Mounted Square Rib Nyantekyi-Kwakye, B., Tachie, M. F., & Clark, S. P. (2016). Flow characteristics of an offset jet over a surface mounted square rib. Journal of Turbulence, 17(8), 727-757.en_US
dc.identifier.citationAcoustic Doppler Velocimeter Measurements of a Submerged Three-Dimensional Offset Jet Flow over Rough Surfaces Nyantekyi-Kwakye, B., Tachie, M. F., Clark, S. P., Malenchak, J., & Muluye, G. (2016). Journal of Hydraulic Research, doi: 10.1080/00221686.2016.1212413en_US
dc.identifier.urihttp://hdl.handle.net/1993/31626
dc.language.isoengen_US
dc.publisherTaylor and Francis Groupen_US
dc.rightsopen accessen_US
dc.subjectAcoustic Doppler velocimeteren_US
dc.subjectParticle image velocimeteren_US
dc.subjectThree-dimensionalen_US
dc.subjectOffset jeten_US
dc.subjectProper orthogonal decompositionen_US
dc.subjectTwo-point correlationen_US
dc.subjectSurface mounted riben_US
dc.subjectSurface roughnessen_US
dc.subjectNozzle expansion ratioen_US
dc.titleExperimental investigation on the flow characteristics of three-dimensional turbulent offset jetsen_US
dc.typedoctoral thesisen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
nyantekyi kwakye_Baafour.pdf
Size:
7.2 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
2.2 KB
Format:
Item-specific license agreed to upon submission
Description:
Download
Collections
FGS - Electronic Theses and Practica