Abstract
The experimental setup is described and results are presented for measuring average boiling-up lag time for superheated n-hexane mixed with solid structures (activated coal, cellulose, silica gel) as function of temperature under atmospheric pressure. The “aging” of the cell with the filler was carried out before measurements: this was about 600–1000 boiling events. We developed a new method for analysing of “aging” procedure: comparison of average flux (frequency) of boiling-up events (processing of experimental data) and the frequency of nucleation obtained from exponential model. By the end of aging of the cell with silica gel the average empirical flux reduces by factor of four relative to the “exponential” value. But for activated coal and cellulose the difference in these fluxes is about 20 %. In all experiments, the event flux was nonstationary. For n-hexane in tested systems, the margin of superheating was T n/T cr ≅ 0.873–0.875, although it was T n/T cr ≅ ≅ 0.883 for n-pentane in systems filled by nickel powder (sintered porous nickel with grains of 1.5 or 5.0 micron size) and in the presence of a smooth copper plate. The average time of boiling-up lag in n-hexane at low normalized temperatures was also smaller than for n-pentane. For all systems, the lag time is almost the same for the temperature range T n/T cr ≅ 0.860–0.874 (plateau). Thus, a smaller amount of superheated liquid or its division into smaller liquid elements does not result in longer liquid lifetime for superheat liquid and the maximal superheat temperature, as one could expect from the classical theory of homogeneous nucleation.
Similar content being viewed by others
References
V.P. Skripov, Metastable Liquid, Nauka, Moscow, 1972.
V. P. Skripov, E.N. Sinitsin, P.A. Pavlov, G.V. Ermakov et al. Thermophysical Properties of Liquids in Metastable State, Atomizdat, Moscow, 1980.
P.A. Pavlov, Boiling-up Dynamics for Superheated Liquids, UB AS USSR, Sverdlovsk, 1988.
V.G. Baidakov, Overheating Cryogenic Liquids, UB RAS, Ekaterinburg, 1995.
G.V. Ermakov, Thermodynamic Properties and Boiling-up Kinetics of Superheated Liquids, Ekaterinburg, UB RAS, 2002.
E.N. Sinitsin and V.S. Uskov, Boiling of superheated liquid in a presence of metallic surface under isothermal conditions, J. of Engng. Phys., 1983, Vol. 44, No. 1, P. 13–15.
A.M. Kaverin, V.G. Baidakov, V.P. Skripov, and A.N. Katyanov, Limiting superheat of liquid oxygen in metallic cells. Tech. Phys., 1985, Vol. 55, No. 6, P. 1220–1222.
V.G. Baidakov and A.M. Kaverin, Kinetics of homogeneous and heterogeneous nucleation in superheated liquid nitrogen, High Temperatures, 1990, Vol. 28, No. 1, P. 90–96.
E.N. Sinitsin and I.M. Paderin, Boiling-up of superheated n-pentane on porous nickel under isothermal conditions, Teplomassoobmen, ITMO BAS, Minsk, 1988, Vol. 4, P. 169–171.
E.N. Sinitsin and I.M. Paderin, Boiling-up of superheated n-pentane on porous nickel while steady pressure release, in: Thermal processes and Metastable States, UB AS USSR, Sverdlovsk, 1990, P. 54–56.
I.M. Paderin and V.S. Uskov, Boiling-up for moderate superheated liquids on a porous surface, in: Thermodynamics and Kinetics of Boiling, Ekaterinburg, UB RAS, 1993, P. 85–89.
I.M. Paderin, V.S. Uskov, and G.V. Ermakov, Kinetics of superheated liquid boiling-up in the presence of porous or smooth surface, High Temperatures, 1994, Vol. 32, No. 6, P. 863–866.
I.M. Paderin and G.V. Ermakov, Boiling-up of superheated n-pentane on nickel powder, Proc. 2nd Nat. Conf. on Heat Transfer, Moscow, MEI, 1998, Vol. 4, P. 195–198.
A.L. Gurashkin and G.V. Ermakov, Experimental study of boiling-up kinetics and superheating limit for n-hexane in structures made from silica and powder cellulose, in: Metastable States and Phase Transitions [Collection of research papers, Iss. 7], UB RAS, Ekaterinburg, 2004, P. 251–260.
E.S. Ventsel, Probability Theory, Nauka, Moscow, 1969.
Handbook on Probability Theory and Mathematic Statistics, V.S. Koroluk et al. (Eds.), Nauka, Moscow, 1985.
Author information
Authors and Affiliations
Additional information
Research was supported by the RF Presidential Foundation (NS-905.2003.2) and Russian Foundation for Basic Research (Grant No. 04-02-16285).
Rights and permissions
About this article
Cite this article
Gurashkin, A.L., Perminov, S.A. & Ermakov, G.V. Experimental study of boiling-up kinetics and superheat limit for n-hexane on solid powder-like structures. Thermophys. Aeromech. 13, 591–599 (2006). https://doi.org/10.1134/S0869864306040135
Received:
Issue Date:
DOI: https://doi.org/10.1134/S0869864306040135