1 edition of Interaction of a swirling jet with a free surface found in the catalog.
1996 by Naval Postgraduate School, Available from National Technical Information Service in Monterey, Calif, Springfield, Va .
Written in English
The turbulent flow field of a swirling jet issuing from a nozzle, beneath and parallel to a free surface has been studied in as much detail as possible using a three-component laser Doppler velocimeter and flow visualization. The results have shown that the swirl leads to the faster spreading and quicker mixing of the jet. For strongly swirling jets (S = 0.522), the similarity is not reached within ten diameters downstream. The results have also shown that both the acial and tangential velocity components decrease outward from the jet axis, naturall leading to centrifugal instabilities. This, in turn, leads to the creation of large scale coherent structures at the periphery of the jet, particularly when it is in the vicinity of the free surface. The turbulent shear stresses exhibit anisotropic behavior, the largest always being in the plane passing through the jet axis. The change of TKE with S is not monotonic. It is maximum for S - 0.265, smallest for S = 0.50, and has an intermediate value for S - 0.522. This is due to the occurrence of vortex breakdown and the resulting intensification of the turbulence within the jet prior to its exit from the nozzle.
|Statement||Michael S. Feyedelem|
|The Physical Object|
|Pagination||175 p. ;|
|Number of Pages||175|
Heat Transf. Speed-shear is important in convective storm forecasting as it literally whisks away the "exhaust" of a storm, thus helping to prolong it: the storm's updraught and precipitation-core downdraught are kept apart, instead of the downdraught choking the updraught. Beyond the tropics, the dominant forces act in the horizontal direction, and the primary struggle is between the Coriolis force and the pressure gradient force. Your device should still be under warranty so if you keep trying they should exchange it. Theisen, E.
Replied on January 7, In reply to Gary Coombs's post on January 7, I'm sure they are lovely people at the Microsoft store - but I shouldn't have to spend my time going to one. Gayton, J. Given both hydrostatic and geostrophic balance, one can derive the thermal wind relation: the vertical gradient of the horizontal wind is proportional to the horizontal temperature gradient. In an ideal fluid this energy can never be dissipated and the vortex would persist forever.
When you stop shaking the cup or put it down on a surface, the vortex is able to evenly distribute force to the liquid. Posada, D. However, real fluids exhibit viscosity and this dissipates energy very slowly from the core of the vortex. How that plays out in terms of agriculture and economics remains to be seen, but there should be no room for complacency. Ebadian, M.
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They are sometimes created by dolphins and whales. The full-scale, half-symmetry LP mesh used in the LP simulation included unstructured hexahedral elements and accounted for the graphite posts, the helium jets, the exterior walls, and the bottom plate with an adiabatic outer surface.
A further pressure-pattern that has been recognised in recent years, and has been linked to the rapid warming of the Arctic, is the Arctic Dipole: Graphic: author In the Dipole pattern, high pressure sits over the Canadian side of the Arctic and low pressure sits over the opposite, Siberian, side.
For example, when an airplane engine is started, a vortex usually forms ahead of each propelleror the turbofan of each jet engine. Further examples[ edit ] The visible core of a vortex formed when a C uses high engine power at slow speed on a wet runway. Sadoughi, A.
Graphic: author As the simple diagram above shows, one consequence of Arctic Amplification is to reduce the temperature-gradient between the Arctic and the warmer latitudes. Posada D. Further heat, independant of sea ice or snow-cover, is transported into the Arctic by the increased global water-vapour content of Interaction of a swirling jet with a free surface book atmosphere, a factor that has three effects.
A vortex with helical Interaction of a swirling jet with a free surface book is said to be solenoidal. New York: H.
Descent is very adept at killing off convection and cyclonic storm development. Although daily data are available, the NAO is typically expressed in monthly or seasonal terms.
Swift, B. Positive vorticity in the upper Troposphere encourages air at lower levels to ascend en masse. As warm sunlight heats the lower Troposphere over the hills, air will begin to rise by convection: at the same time, a sea-breeze will set in, flowing west to east inland from the coast.
The sense of rotation of hurricanes is influenced by the Earth's rotation. The greater the north-south meandering movement, the more meridional it is said to be.
Photos: author. However, recent research suggests a greater northwards component to this behaviour the ridges are pushing further northwards than the troughs are nosing southwardsmeaning that in overall terms the Polar jet stream has moved northwards. Rossby Wave theory predicts this but there is a simple analogy: think of a river's flow weakening as it leaves the mountains and enters the lowlands, where it becomes sluggish and meanders develop and propagate seawards along the flood plain over many decades.
This Generation-IV reactor would operate at elevated exit temperatures of 1, K, and the fueled core would be cooled by forced convection helium gas.
There is only one vertical direction in which the air can freely go - downwards. The Troposphere, which this post concerns, can be divided into two subsections: an upper layer, known as the Free Atmosphere, and a lower layer, known as the Planetary Boundary Layer. Hirsa, A. There has been approximately 2C of late spring-early summer warming over high-latitude land areas since the mids, heat which is contributing to the Arctic Amplification effect during the summer months.
In upper-air meteorology, pressure-patterns are as important as they are down here at the surface. Amono, R. What this means on the ground is that if your area is near to a developing low pressure system or a convectively-unstable airmass and an upper trough is approaching, with a jetstreak heading towards the base of the trough with its Left Exit region heading straight for where you are, you have the ingredients for explosive severe weather development.
A simple example of irrotational flow is a whirlpool, which is known as a potential vortex in fluid mechanics.A study is made of the laminar flow of a viscous incompressible fluid in a swirling jet that is produced by the action of a point source which transmits to It is shown that in the case of weak swirling of the jet the interaction of the azimuthal and axial motions is basically nonlinear.
“Motion of Cited by: 3. May 11, · Surface Book i5 GB. 2 points · 1 year ago. I bought the base model as a refurb from the Microsoft store for CAD$ as I wanted a machine with good battery life and the ability to take good handwritten notes for my upcoming college program this fall.
So far, I have been really enjoying it and even though it's "older" I find that it is. Overview of the Jet/Surface Interaction Test (Jsit1) [Gary Podboy, Nasa Technical Reports Server (Ntrs), Et Al] on tjarrodbonta.com *FREE* shipping on qualifying offers.
The NASA Technical Reports Servcr (NTRS) houses half a million publications that are a valuable means of information to researchersAuthor: Gary Podboy, Cliff Brown, Tim Bencic.In this work mean and pdf characteristics of the recirculating flowfield generated by a swirling jet under the influence of a coaxial stream are discussed, laying emphasis on the structure of the recirculation bubble and its effect on the interaction and mixing of the two tjarrodbonta.com by: Atmospheric Pressure, Winds, and Circulation Patterns A n individual gas molecule weighs almost nothing; however, the atmosphere as a whole has considerable weight and exerts an average pressure of grams per square centimeter ( lb/sq in.) on Earth’s surface.
The .Dec 12, · AbstractEffects ebook swirling secondary flow on the decay characteristics of non-circular ebook supersonic primary jets were experimentally studied.
Primary jet is issuing from a convergent-divergent nozzle with different exit geometry such as circle, cruciform, triangle and rectangle. In this study, two different methods were used to impart swirl on the secondary flow as follows, (i Author: S.
Gopinath, M. Sundararaj, S. Elangovan, B.T.N Sridhar.