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Simulation of flow and heat transfer under a laminar impinging round jetSaad, Nabil Raymond. January 1975 (has links)
No description available.
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Interaction of ventilating jetsMarangoni, Arnaldo. January 1966 (has links)
Call number: LD2668 .T4 1966 M311 / Master of Science
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An analysis of a horizontally projected chilled jet subjected to vertical crossflowJones, Roger L January 2011 (has links)
Digitized by Kansas Correctional Industries
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Investigation of an axisymmetrical chilled vertical jet projected into a stratified environmentBailey, Thomas F January 2011 (has links)
Digitized by Kansas Correctional Industries
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Heat transfer between a plane surface and a pulsating, perpendicularly impinging air jetBurmeister, Louis C. January 1959 (has links)
Call number: LD2668 .T4 1959 B86
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An apparatus for study of the effect of suction on heat transfer for impinging round jets /Obot, Nsima Tom. January 1975 (has links)
No description available.
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The spout of air jets upwardly injected into a water bathSahajwalla, Veena January 1988 (has links)
The spout formed at the free surface of a gas-stirred liquid has received little attention even though it has both theoretical and practical significance. In steelmaking ladles, for example, the spout is the site of strong metal-slag-air mixing which affects: the kinetics of reactions at the slag-metal interface, the absorption of oxygen by the bath and the temperature drop of the bath. Notwithstanding its importance, the spout is usually neglected in flow models of gas-stirred baths because it has not been characterized quantitatively; assumption of a flat top surface, however, reduces the accuracy of the velocity and kinetic energy predictions, particularly close to the spout region.
Thus in this study, the spout of upwardly injected gas jets in water was characterized
experimentally in terms of gas fraction, bubble frequency and axial velocity distributions. The measurements were made with a two-element electroresistivity probe coupled to a microcomputer. Special hardware and software were developed to analyze
the signals generated by contact of the bubbles with the sensor, in real time, for the turbulent flow conditions prevailing in the jet plume and spout. Correlations of the gas fraction with axial and radial position for different gas flow rates have been established from the measurements. The dimensions of the spout were obtained from time-exposure photographs; when compared with the gas fraction measurements, the spout boundary always corresponded to values ranging from 0.82 to 0.86. The radial profiles of bubble frequency at different levels in the spout have a bell shape; the bubble frequency decreases with increasing height. The velocity of the bubbles in the spout drops linearly with increasing axial position. Measurements of bath velocity near the walls of the vessel were also conducted with a laser doppler velocimeter for comparison to model predictions.
The gas fraction data obtained for the spout then were incorporated into a mathematical
model of turbulent recirculatory flow with which predictions of velocity, kinetic energy and effective viscosity in the bath were made. Predictions of the model were compared with the experimental measurements as well as with predictions assuming a flat bath surface (no spout); and the importance of incorporating the spout thus was demonstrated. The variation of the total kinetic energy in the spout with gas flow rate was determined. The energy increased with flow rate, as expected, but at a critical value, the rate of increase abruptly rose. Based on photographs taken of the gas/liquid dispersion, the increased spout kinetic energy appears to be related to the location of bubble break-up and possibly to gas channeling. At lower flow rates below the critical
value, the bubble break-up occurs relatively close to the nozzle, whereas at higher flow rates bubble disintegration is nearer to the surface. At the lower flow rates the gas/liquid interaction was maximum which promoted the gas/liquid momentum transfer.
Moreover, at the higher flow rates the gas dispersion was observed intermittently to be a continuous chain of large envelopes which could permit a fraction of the gas to channel through the bath for a considerable distance. The channeling phenomenon could lead to an inefficient gas/liquid energy transfer resulting in a reduced efficiency of bath mixing and enhanced energy release at the surface. These results can explain the observations of previous investigators who found that beyond a critical gas injection rate, the rate of decrease of mixing time with flow rate decreased. The metallurgical consequences of the spout and its influence on the flow field, especially in the near-surface region, have been highlighted, thus unveiling the practical bearing of the spout on the gas injection process. / Applied Science, Faculty of / Materials Engineering, Department of / Graduate
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An apparatus for study of the effect of suction on heat transfer for impinging round jets /Obot, Nsima Tom. January 1975 (has links)
No description available.
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Interactions of a fully modulated inclined jet with a crossflowDano, Bertrand P. E. 29 November 2005 (has links)
Jets in crossflow are used in a wide range of engineering applications and have been
studied for more than 60 years. The transversal penetration and structure of a jet placed
in a crossflow is known to be strongly three-dimensional. It is believed that, by using a
pulsed jet inclined in the crossflow direction, the momentum transport can be controlled
in two very efficient ways: the pulse can increase the jet penetration and the mixing
downstream, while the inclination avoids the creation of a reverse flow at the jet exit
and may extend the mixing area further downstream. Although some results are
available in the literature focusing on components of this problem, none addresses the
combination of these two factors. Moreover, most of these studies use elaborate flow
visualizations and 2-D velocity measurement methods that may not be adequate to
elucidate the complexity of such a flow.
This study addresses these issues by using stereoscopic PIV measurements for a
steady and fully modulated jet at a constant mean velocity ratio, V[subscript r], of 3.4. For the
steady jet case, the effect of the jet Reynolds number, Re[subscript j], is investigated. For the
pulsed case, the effect of a low pulsing frequency is considered as well as the pulse duty
cycle. For each case, the mean three-component velocity field is examined. Proper
Orthogonal Analysis (POD) of vorticity and turbulent kinetic energy are used to further
evaluate the vortical and turbulent characteristics of the jet. In addition, a vortex
detection algorithm, and 3D rendering of the flow streamlines are used to study the near
field vortical flow structure of the jet flow. / Graduation date: 2006
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The design and validation of an impinging jet test facilityRobertson, Peter R. Van Treuren, Kenneth W. January 2005 (has links)
Thesis (M.S.)--Baylor University, 2005. / Includes bibliographical references (p. 124-128).
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