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Topic: Isentropic

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In the News (Fri 25 Jul 14)

  Isentropic Flow Equations
Isentropic flows occur when the change in flow variables is small and gradual, such as the ideal flow through the nozzle shown above.
We call this an isentropic expansion because of the area increase.
The isentropic relations are no longer valid and the flow is governed by the oblique or normal shock relations.
www.grc.nasa.gov /WWW/K-12/airplane/isentrop.html   (868 words)

The idea of isentropic lifting is air "prefers" to move toward air with the same density.
The uplift is at a lower angle than uplift that is generally associated with cold fronts and thermodynamic thunderstorms.
Answer: It is because isentropic lifting does not occur on a constant pressure surface.
www.theweatherprediction.com /advanced/isentropic   (423 words)

 Isentropic Process
Isentropic (reversible adiabatic) processes are often desired and are often the processes on which device efficiencies are based.
One example of a process that approaches being isentropic is the rapid depressurization of gas in a cylinder.
To demonstrate a nearly isentropic process and to compare the results of the experiment with the theoretical isentropic process for the gas used in the process.
www.me.utexas.edu /~tfsexpts/thermo/isentropic.htm   (502 words)

 Quantification of the isentropic mass transport across the dynamical tropopause   (Site not responding. Last check: 2007-10-12)
This method is based on the contour advection technique and is used to calculate isentropic mass fluxes across the tropopause on the 330, 345 and 360 K surfaces from ECMWF analyses for the years 1997 and 1998.
Isentropic stratosphere-troposphere exchange is, however, a two-way process, and the net flux is the residual of troposphere-to-stratosphere and stratosphere-to-troposphere transport, which can be of similar magnitude.
It is shown that the isentropic mass fluxes are of the same order of magnitude as the upward vertical mass fluxes across the tropical tropopause by the large-scale circulation.
ugamp.nerc.ac.uk /cgam-trop/abstracts/antje1.html   (281 words)

 Definition of isentropic - Merriam-Webster Online Dictionary
Learn more about "isentropic" and related topics at Britannica.com
Find more about "isentropic" instantly with Live Search
See a map of "isentropic" in the Visual Thesaurus
www.m-w.com /cgi-bin/dictionary?book=Dictionary&va=isentropic   (41 words)

 Grid Point: Data Representation
Since isentropic coordinates are a "natural" coordinate system, in which adiabatic flow follows the coordinate surfaces themselves, adiabatic vertical motions are included within the "horizontal" component of the forecast equations.
Because isentropic surfaces terminate when they intersect the earth's surface and can move up and down through the earth's surface throughout the day, they are not available at all times and locations for making calculations and their behavior cannot be modeled easily.
Isentropic surfaces have steep slopes in the vicinity of sharp baroclinic regions, such as fronts.
www.met.tamu.edu /personnel/faculty/fzhang/ATMO689/lecture11/Lecture11.htm   (4686 words)

The slope of the isentropic surface is a function of the thermal gradient (Moore 1993)." A vertically sloping isentropic surface shows a strong temperature contrast.
Recalling the equation for vertical motion in isentropic coordinates, it is apparent that the B term or pressure advection is significant with the cross isobar flow.
Isentropic analysis allows the forecaster to view the atmosphere like it should be, and it can be a useful tool not only for wind but for an array of parameters.
www.wrh.noaa.gov /wrh/96TAs/TA9605/ta96-05.html   (3171 words)

 Winter Lightning in the Southeast U.S. and its Relation to Heavy Frozen Precipitation   (Site not responding. Last check: 2007-10-12)
The table reveals that in five of seven cases, isentropic lift was either a primary or secondary cause of upward vertical motion and resulting precipitation.
The isentropic motion is directly associated with low-level warm air advection (Doswell, 1982).
Also, isentropic lift and warm air advection in the lightning area were minimal, as there was weak low-level flow and no strong thermal boundary.
www.srh.noaa.gov /mrx/research/Lgtg/slspaper.htm   (2138 words)

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