May 05, 2017 · The polytropic process for thermodynamics is PVn =constant. This video covers the integration of the work equation using this thermodynamic process. It also ... Polytropic Process of an Ideal Gas • The relationship between the pressure and volume during compression or expansion of an ideal gas can be described analytically. One form of this relationship is given by the equation pVn = constant • where n is a constant for the particular process.
Value of n for any polytropic process can very from 0 to infinity. All the know process like constant volume, constant pressure,adiabatic etc are also special cases of polytropic process.

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For example, the terrestrial air is primarily made up of diatomic gases (around 78% nitrogen, N 2, and 21% oxygen, O 2), and at standard conditions it can be considered to be an ideal gas. The above value of 1.4 is highly consistent with the measured adiabatic indices for dry air within a temperature range of 0–200 °C, exhibiting a deviation ...
Polytropic Process. A polytropic process is any thermodynamic process that can be expressed by the following equation: pV n = constant. The polytropic process can describe gas expansion and compression which include heat transfer. The exponent n is known as the polytropic index and it may take on any value from 0 to ∞, depending on the ...

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We know that PV^n = C, where n is the polytropic compression index. If we want to compress air from atmospheric pressure to a pressure of 30 bar, and say the ambient temperature is 27 degree Celsius: The compression index n = 1.35 and the compression ratio for single-stage compressor would be 30:1.
Air is expanded from 1 MPa, 327C to 200 kPa in a closed piston-cylinder device through a polytropic process with index n=1.2. The work produced during this process is closest to: Select one: a. 422.8 kJ/kg b. 504.2 kJ/kg c. 202.6 kJ/kg d. 263.4 kJ/kg e. 361.7 kJ/kg

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In practice most expansion and compression processes are somewhere in between, or said to be polytropic. The polytropic process can be expressed as. pV n = constant (3a) or . p 1 V 1 n = p 2 V 2 n (3b) where . n = polytropic index or exponent (ranging 1 to 1.4)
Most people chose this as the best definition of polytropic: (physics) Of any change i... See the dictionary meaning, pronunciation, and sentence examples.

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Determine the polytropic process index 'n' from the initial and final condition parameters of the air (gas) in the air compressor cylinder" I have answers for part a which have been marked as correct, but on part b) im getting an answer of n = 1.3, which is being marked as incorrect and im not sure where im going wrong. my tutor says the answer ...
Nov 29, 2013 · Experiment 5 Polytropic Expansion of Air 35 The Experiments Photographs of the equipment appear in Figures 5.2 and 5.3, and a sketch of the components appears in Figure 5.4. steel pressure vessel d ischarge valves thermocouple conduit pressure transducer Figure 5.2 The polytropic expansion experiment at Cal Poly. thermocouples thermocouple ...

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A polytropic process is a thermodynamic process that obeys the relation: p V n = C {\displaystyle pV^{\,n}=C} where p is the pressure, V is volume, n is the polytropic index, and C is a constant. The polytropic process equation can describe multiple expansion and compression processes which include heat transfer.
Value of n for any polytropic process can very from 0 to infinity. All the know process like constant volume, constant pressure,adiabatic etc are also special cases of polytropic process.

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Neutron stars are well modeled by polytropes with index between n = 0.5 and n = 1. A polytrope with index n = 1.5 is a good model for fully convective star cores (like those of red giants), brown dwarfs, giant gaseous planets (like Jupiter). With this index, the polytropic exponent is 5/3, which is the heat capacity ratio (γ) for monoatomic gas.
Air Mass (astronomy) - Calculating Air Mass - Atmospheric Models - Polytropic Atmosphere... is simplistic a more realistic model is the polytropic atmosphere, for which where is the sea-level temperature and is the temperature lapse rate ... a function of elevation is where is the polytropic exponent (or polytropic index) ...

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Value of n for any polytropic process can very from 0 to infinity. All the know process like constant volume, constant pressure,adiabatic etc are also special cases of polytropic process.
Sep 02, 2015 · For a pressure ratio of 8:1 the theoretical power per 1/s of air compressed is 0.208 kW for isothermal, 0.284 kW for isentropic, 0.248 kW for polytropic (n = 1.2) and 0.242 kW for a 2-stage compressor. See Figure 3. Multi-staging is valuable for other reasons than efficiency.

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However, a polytropic index of about 1.4 for the quiet plasma sheet indicates that the latter behaves like a poorly insulated vessel. Hence, there seems to be no quiet time magneto‐tail equilibrium (“ground state”), but rather continuous cooling until new energy is entering from the outside.

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Suppose a tank filled with gas is discharing, then the pressure and temperature will decrease. consider two instances (p1,v1) and (p2,v2) with some time interval. If there is no heat addition then...

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Value of n for any polytropic process can very from 0 to infinity. All the know process like constant volume, constant pressure,adiabatic etc are also special cases of polytropic process.
Most sources Ive found say that when dealing with the polytropic index for flow calculations for compressors, an ideal process is isothermal for the least amount of required work (n = 1). I know that n = 1.20 - 1.35 is the most common for this scenario.

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Polytropic Process. A polytropic process is any thermodynamic process that can be expressed by the following equation: pV n = constant. The polytropic process can describe gas expansion and compression which include heat transfer. The exponent n is known as the polytropic index and it may take on any value from 0 to ∞, depending on the ...
For air, R = 287 J/kg/K. Specific heat capacity. ... The value of n is the polytropic index and depends on the process. The specific work done for a polytropic ...

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the air to the surroundings. a – b: Compression process . Both valves closed. The induced air is compressed according to the polytropic law of . pV. n = const., until the pressure . and temperature increases to . p2 and T2, respectively. Ideally, there is no heat transfer from the air to the surroundings of cylinder.
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Polytropic fluids. Polytropic fluids are idealized fluid models that are used often in astrophysics. A polytropic fluid is a type of barotropic fluid for which the equation of state is written as: P = Kρ (1 + 1 / n) where P is the pressure, K is a constant, ρ is the density, and n is a quantity called the polytropic index.
Oct 19, 2018 · For example, in a chemical plant multistage gas compressor, if each stage has the same polytropic efficiency, it will be also the same polytropic efficiency of the total stage machine. Another convenience comes for them. Ironically the similar air compressor field has more often used the isentrpoic efficiency despite the same compressor group.

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Sep 25, 2010 · where is the heat capacity ratio, the polytropic index, and the work done during the expansion. Isothermal Expansion Or Compression For different values of the polytropic index , the polytropic process defined by ( 2 ) will be equivalent to other particular processes.

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