Abstract
Analytic expressions are obtained for the parameters which determine the number of particles (clusters) and their mean radius and the supercooling at the starting point of active homogeneous condensation (the Wilson point). With a given law p=f(T), such parameters are the temperature Ts at the dew point and the mean cooling rate\(\dot T{_s}\) = dT/dt of the gas from the dew point to the Wilson point. In this context, with Ts = const and\(\dot T{_s}\) = const, the processes of nonequilibrium homogeneous condensation in the P-T diagram corresponding to the various initial states after the Wilson point may be described approximately by a single curve. So the parameters Ts and\(\dot T{_s}\) are determining parameters for the whole process of nonequilibrium homogeneous condensation. Equations are given which enable us to estimate approximately the cooling rate\(\dot T\) for flows in nozzles and jets. Computation results are given for steady flow in a Laval nozzle and unsteady spherically symmetric expansion of a gaseous sphere into a vacuum; these results demonstrate the noted regularities. Despite the great amount of literature, both periodical and monograph, on the nonequilibrium condensation of vapors, the important question of the determining parameters for the process of a homogeneous nonequilibrium condensation has not been studied to any great extent [1].
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V. N. Gorbunov, U. G. Pirumov, and Yu. A. Ryzhov, “A study of the homogeneous condensation of a gas,” Sixth All-Union Conference on the Dynamics of Rarefied Gases [in Russian], Institute of Heat Physics, Siberian Branch of the USSR Academy of Sciences, Novosibirsk (1979), p. 157.
Ya. I. Fren'kel, The Kinetic Theory of Fluids [in Russian], Izd. Akad. Nauk SSSR, Moscow (1975).
S. Katake and I. I. Glass, “Flow with nucleation and condensation,” Prog. Aeronaut. Sci.,19, 129 (1981).
A. L. Itkin, U. G. Pirumov, and Yu. A. Ryzhov, “The study of nonequilibrium homogeneous condensation of water in rarefaction waves, with allowance for real properties,” in: High-Temperature Gas Dynamics, Shock Tubes, and Shock Waves [in Russian], Institute of Heat and Mass Transfer, Minsk (1983), pp. 112–118.
U. G. Pirumov and G. S. Roslyakov, Gas Flows in Nozzles [in Russian], Moscow State University (1978).
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Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 3, pp. 80–87, May–June, 1985.
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Pirumov, U.G. Determining parameters in nonequilibrium flow of a gas with homogeneous condensation. Fluid Dyn 20, 404–410 (1985). https://doi.org/10.1007/BF01049993
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DOI: https://doi.org/10.1007/BF01049993