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Topic: Isentropic process

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Adiabatic process

Isothermal process

Entropy

Adiabatic

Reversible process

Isobaric process

Thermodynamics

Carnot cycle

Conservation of energy

Chemical engineering

Inert gas

Dynamic random access memory

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Refrigeration

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	Adiabatic process - Wikipedia, the free encyclopedia
		In thermodynamics, an adiabatic process is a process in which no heat is gained or lost in the working fluid.
		An isentropic process must be quick enough so that heat transfer reamains negligible, but slow enough to comply to the quasistatic process limit.
		Adiabatic heating and cooling are processes that commonly occur due to a change in the pressure of a gas.
	en.wikipedia.org /wiki/Adiabatic_process (894 words)

	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.
		The generation of sound waves is an isentropic process.
		The isentropic relations are no longer valid and the flow is governed by the oblique or normal shock relations.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 (882 words)

	Chemical Engineering 260AA – Spring 2003 (Site not responding. Last check: 2007-10-26)
		The entropy change of air during this process is to be determined for the cases of constant and variable specific heats.
		The process is given to be reversible and adiabatic, and thus isentropic.
		The isentropic efficiency of the compressor and the exit temperature of air for the isentropic case are to be determined.
	courses.washington.edu /che260/solution7.htm (1010 words)

	Fun quest... - Refrigeration-Engineer.com forums
		But compression is isentropic rather than adiabatic, as the prof explains in the fundamentals section, so residual gas in the clearance pocket doesn't necessarily add to isentropic losses, it mostly helps to drive the piston back and in so doing it helps the other pistons with their compression.
		An isentropic process is also reversible, by definition, which is to say entropy does not change, and that energy expended in the process can be recovered.
		isentropic process is, by normal definition, an adiabatic process.
	www.refrigeration-engineer.com /forums/showthread.php?t=171 (1175 words)

	Thermodynamics Glossary (Site not responding. Last check: 2007-10-26)
		The combustion process is replaced by a constant-pressure heat-addition process from an external source, and the exhaust process is replaced by a constant-pressure heat-rejection process to the ambient air.
		is entropy generated or created during an irreversible process, is due entirely to the presence of irreversibilities, and is a measure of the magnitudes of the irreversibilities present during that process.
		is a process during which heat is transferred to a thermal energy storage device (called a regenerator) during one part of the cycle and is transferred back to the working fluid during another part of the cycle.
	www.hpt.chalmers.se /swedish/Termodynamik/Glossary.html (12103 words)

	Thermodynamics Definitions and Terminology - Engineers Edge (Site not responding. Last check: 2007-10-26)
		Entropy Balance for Closed Systems - The entropy change of a closed system during a process is equal to the sum of the entropy transferred through the system boundary by heat transfer and the entropy generated within the system boundaries as a result of irreversibilities.
		Heat Regeneration - A process during which heat is transferred to a thermal energy storage device (regenerator) during one part of the cycle and is transferred back to the working fluid during another part of the cycle.
		In a reversible process, the ratio of the heat associated with the high temperature to the heat associated with the low temperature is equal to the ratio of the high temperature over the low temperature.
	www.engineersedge.com /thermodynamics.htm (2559 words)

	[No title]
		Combustion / Expansion Process 3 - 4 The piston begins to move away from TC position, and maintains a constant temperature as it burns the remaining 30% of the fuel energy.
		Expansion Process 4 - 5 The combustion gases continue to expand in an isentropic process until the piston reaches BC.
		Constant Volume Reversion Process 7 - 8 As the piston nears TC position, the exhaust valve closes and the intake valve opens, instantly changing the cylinder pressure from the exhaust pressure to the intake manifold pressure (200 kPa) at constant volume.
	www-personal.umich.edu /~tjjacobs/438/hw4.doc (566 words)

	ch.6 definitions (Site not responding. Last check: 2007-10-26)
		entropy balance for closed systems : the entropy change of a closed system during a process is equal to the sum of the entropy transferred through the system boundary by heat transfer and the entropy generated within the system boundaries as a result of irreversibilities.
		internally reversible adiabatic (isentropic process) : a process that involves no heat transfer (adiabatic) and no irreversibilities within the system (internally reversible), and the entropy of a fixed mass must remain constant during that process.
		A process must proceed in the direction that complies with the increase of entropy principle.
	www.ocf.berkeley.edu /~ssoong/me105/definitions/me105_6.html (477 words)

	Isentropic process - TheBestLinks.com - Adiabatic process, Entropy, Fluid, Heat transfer, ...
		Isentropic process - TheBestLinks.com - Adiabatic process, Entropy, Fluid, Heat transfer,...
		Isentropic process, Adiabatic process, Entropy, Fluid, Heat transfer
		An isentropic process (a combination of the Greek word "iso" -same- and entropy) is one during which the entropy of working fluid remains constant.
	www.thebestlinks.com /Isentropic_process.html (105 words)

	Heat Transfer & Thermodynamics engineering - Gas Cooling on Expansion
		Expansion of a gas in a cylinder where pressure is released is approximated by an isentropic process, ie: entropy remains constant.
		Admittedly the process is not entirely adiabatic, but it only takes a few seconds to release the pressure in the bottle and the plastic is not very conductive nor is it a large heat sink, it should be nearly adiabatic.
		The J-T coef is for a constant enthalpy process.
	www.eng-tips.com /viewthread.cfm?qid=78680 (6152 words)

	[No title]
		Isentropic process - This is normally taken as a reversible, constant entropy process.
		Since ds = (Q/T in a reversible process, the isentropic process is taken as a reversible, adiabatic process (with s=constant).
		For a perfect gas, the path for an isentropic process is given by pvk = constant (where k=cp /cv, the ratio of principal specific heats).
	www2.msstate.edu /~ade/Th1_review.doc (1756 words)

	Re: what is the difference between adiabatic and isothermal change?
		First, a few definitions: - "A process that takes place in such a way that no heat flows into or out of the system is called an adiabatic process." (P. 564, Halliday and Resnick, Physics, 1966) - "A reversible process of special importance is the reversible adiabatic process...
		The Carnot cycle is frequently illustrated by a pressure vs. volume, temperature vs. entropy, or enthalpy vs. entropy curve showing the path followed by a Carnot cycle in transitioning between four states.
		Two of the transitions are isothermal (isothermal expansion of saturated liquid to saturated vapor and isothermal compression of vapor), and two of the transitions are isentropic (reversible adiabatic processes) (an isentropic expansion of vapor and an isentropic compression).
	www.madsci.org /posts/archives/2001-03/984493537.Ph.r.html (264 words)

	Throttling Process
		if the process the system goes through is reversible and adiabatic.
		When a gas undergoes a reversible process in which there is heat transfer, the process frequently
		An example of a throttling process is an ideal gas flowing through a valve in midposition.
	www.tpub.com /content/doe/h1012v1/css/h1012v1_55.htm (310 words)

	WORKED EXAMPLES ON EXERGY
		The start and end points of the process are both at 300K, equal to the temperature of the surroundings.
		The gas is supplied at 5 bar, 900K, and expanded to 2 bar in a turbine.
		USING the above values for work, e = 42% for the non isentropic process and 50% for the isentropic process.
	mail.bris.ac.uk /~memjt/teach/exergy1/worked_egs.htm (464 words)

	[No title] (Site not responding. Last check: 2007-10-26)
		adiabatic = isentropic = reversible Though we will use the concepts of entropy and reversibility in subsequent topics, the main focus for most meteorological applications will be the use of potential temperature as a variable (of state) rather than entropy.
		You can burn a thermodynamics book, but you will not be able to return the ashes to its original book state once burned.
		Entropy ends up being a fairly peculiar variable to deal with, but we will most closely follow the form of the 2nd Law which references entropy and reversible processes.
	www.nadn.navy.mil /Oceanography/courses/SO345_Summer/THERMO8.PPT (444 words)

	[No title] (Site not responding. Last check: 2007-10-26)
		The process ends when the volume is reduced by one-half.
		Determine the entropy change of the helium during this process, assuming (a) the process is reversible and (b) the process is irreversible.
		Determine the final temperature and the work done during this process assuming (a) constant specific heats and (b) variable specific heats for air Because a reversible adiabatic process is isentropic, we can find the final state from the equations for an isentropic process in an ideal gas.
	www.csun.edu /~lcaretto/me370/hw10.doc (752 words)

	ME 416
		For each process described below provide the temperature, pressure, and specific volume at each state and the change in enthalpy, internal energy, and entropy.
		Water as saturated vapor at 65 psia goes isentropically to 25 psia.
		We note that since we have an ideal gas and an isothermal process, our changes in enthalpy and internal energy will be zero.
	www.egr.msu.edu /~somerton/ME201_sec3/proppp/PROP.htm (1215 words)

	Problem Set #3
		C by mixing it in a steady flow with a quantity of air at 90
		Assuming that the mixing process is adiabatic and neglecting changes in kinetic and potential energy, calculate the ratio of the mass flow of air initially at 90
		Calculate the effectiveness of the heating process when the atmospheric temperature is 10
	www.mhtl.uwaterloo.ca /courses/me354/assign3.html (178 words)

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