Another Set of Axioms for Classical Gas Dynamics

1972 ◽  
Vol 13 (6) ◽  
pp. 813-821 ◽  
Author(s):  
Michael Schilder
Keyword(s):  
Gas Dynamics ◽  
Classical Gas

Thermal Choking Due to Nonequilibrium Condensation

1994 ◽  
Vol 116 (3) ◽  
pp. 599-604 ◽  
Author(s):  
Abhijit Guha
Keyword(s):  
Gas Dynamics ◽  
Control Volume ◽  
Full Time ◽  
Condensation Zone ◽  
Explicit Equation ◽  
General Validity ◽  
Integral Control ◽  
Classical Gas ◽  
Nonequilibrium Condensation ◽  
Quantity Of Heat

A theory of thermal choking due to nonequilibrium condensation in a nozzle is presented. An explicit equation for the critical quantity of heat in condensing flow has been derived. The equation is of general validity and applies to vapor-droplet flow with or without a carrier gas. It has been usually assumed in the literature that the classical gas dynamics result for the critical quantity of heat applies in condensing flow as well. The classical result is, however, obtained by considering external heat addition to an ideal gas in a constant area duct. In this paper it is shown that the area variation across the condensation zone (although small) and the depletion in the mass of vapor as a result of condensation have profound effects on the critical quantity of heat. The present equation (derived from an integral, control-volume approach) agrees very well with results from full time-marching solution of the nonequilibrium, differential gas dynamic equations. The classical gas dynamics result, on the other hand, seriously underpredicts the critical heat for condensing flow in nozzles (by a factor of three in the example calculation presented).

Solution of One Classical Gas Dynamics Problem

2019 ◽  
Vol 62 (4) ◽  
pp. 612-619
Author(s):  
A. V. Efimov
Keyword(s):  
Gas Dynamics ◽  
Classical Gas

Non-classical gas dynamics of vapour mixtures

2014 ◽  
Vol 741 ◽  
pp. 681-701 ◽  
Author(s):  
Alberto Guardone ◽  
Piero Colonna ◽  
Emiliano Casati ◽  
Enrico Rinaldi
Keyword(s):  
Binary Mixtures ◽  
Gas Dynamics ◽  
Vapour Phase ◽  
Mixture Composition ◽  
Nonlinearity Parameter ◽  
Mixture Flow ◽  
Cubic Equation ◽  
Ideal Mixing ◽  
Monotone Dependence ◽  
Classical Gas

AbstractThe non-classical gas dynamics of binary mixtures of organic fluids in the vapour phase is investigated for the first time. A predictive thermodynamic model is used to compute the relevant mixture properties, including its critical point coordinates and the local value of the fundamental derivative of gas dynamics $\Gamma $. The considered model is the improved Peng–Robinson Stryjek–Vera cubic equation of state, complemented by the Wong–Sandler mixing rules. A finite thermodynamic region is found where the nonlinearity parameter $\Gamma $ is negative and therefore non-classical gas dynamics phenomena are admissible. A non-monotone dependence of $\Gamma $ on the mixture composition is observed in the case of binary mixtures of siloxane and perfluorocarbon fluids, with the minimum value of $\Gamma $ in the mixture being always larger than that of its more complex component. The observed dependence indicates that non-ideal mixing has a strong influence on the gas dynamics behaviour, either classical or non-classical, of the mixture. Numerical experiments of the supersonic expansion of a mixture flow around a sharp corner show the transition from the classical configuration, exhibiting an isentropic rarefaction fan centred at the expansion corner, to non-classical ones, including mixed expansion waves and rarefaction shock waves, if the mixture composition is changed.

Supernovae and interstellar gas dynamics

1967 ◽  
Vol 31 ◽  
pp. 117-119
Author(s):  
F. D. Kahn ◽  
L. Woltjer
Keyword(s):  
Lower Limit ◽  
High Velocity ◽  
Gas Dynamics ◽  
Interstellar Cloud ◽  
Interstellar Gas ◽  
Random Motions ◽  
Relativistic Particles

The efficiency of the transfer of energy from supernovae into interstellar cloud motions is investigated. A lower limit of about 0·002 is obtained, but values near 0·01 are more likely. Taking all uncertainties in the theory and observations into account, the energy per supernova, in the form of relativistic particles or high-velocity matter, needed to maintain the random motions in the interstellar gas is estimated as 1051·4±1ergs.

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