ηs,p is the isentropic efficiency of the pump, which is the ratio of the work input, for an isentropic process, to the work input for the actual process: (7)W˙turbine=ηs,t(h¯7−h¯8,s) (8)W˙pump=(h¯
We study the motion of isentropic gas in a nozzle. Nozzles are used to increase the thrust of engines or to accelerate a flow from subsonic to supersonic. Nozzles are essential parts for jet engines, rocket engines and supersonicwind tunnels. In the present paper, we consider unsteady flow...
where co is the sound speed, defined by the isentropic bulk modulus of the fluid. Typical values are co = 343 m/s in air and co = 1500 m/s in water. It follows that the density perturbation for a sound level of 140 dB (re 20 μPa) in air is about 1.7 × 10− 3 kg/m3,...
The numerical simulations also confirm that, over a free-slip surface, the Bernoulli equation holds well for an isentropic flow over a mountain before it reaches high-turbulence regions on the lee side. However, the simulated density is not a constant along a constant Bernoulli line. According ...
A transport equation based on mass weighted isentropic zonal means applies to the diagnosis for the meridional ozone transport in the troposphere and stratosphere. The mean and eddy ozone fluxes are estimated from the global distributions of the temperature, wind, and ozone. In comparison with the...
a) How does a polytropic process differ from an isentropic process? b) What is the equation of path for a polytropic process? Solve the differential equation using laplace transformation y"-5y'+4y=0, y(0)=0, y'(0)=3 1) Using the definition of \delta (x) to show that \delta (-...
aXiv08.23vinteractionmodel.Sincesupernovamatterischaracterizedbyaconstantentropywealsoresentthethermodynamicpropertiesforisentropiccase.Specialattentionisdedicatedtohestudyofthecontributionofthecomponentsofβ-stablenuclearmattertotheentropyerparticle,aquantityofgreatinterestforthestudyofstructureandcollapseofsupernova.ACSnum...
the unique weak solution for general initial data v 0 ∈ L 2 (R 1 ). 7. One major shortcoming of this work is that we were not able to prove the uniqueness of such an admissible weak solution satisfying (1.4) and (1.5). The difficulty seems to be the lack of temporal regularity...
The first law of thermodynamics or energy balance for the steady flow process of an open system is given by: ∑Q˙k+m˙hi+Ci22+gZi=m˙ho+Co22+gZo+W˙ where Qk heat transfer to system from source at temperature Tk, and W is the net work developed by the system. The other ...
For small Mach number (M1<1.2), the downstream turbulent field is isentropic, but as the Mach number increases the polytropic exponents reach asymptotic values of nρT=1.9 and npρ=0.7. The resulting field now exhibits non-negligible entropy fluctuations that were not present in the incoming ...