INVESTIGATION OF TRANSIENT NUCLEATE BOILING PROCESSES AND THEIR PRACTICAL USE IN HEAT TREATING INDUSTRY

Nikolai Kobasko

Abstract


In the paper transient nucleate boiling process is widely discussed. It’s unknown previously and investigated by author characteristics create a basis for designing of new technologies which allow receiving super strengthened materials. Obtained results are also used for appropriate software development to be widely applied for control of technological processes and cooling recipes design. A possibility of transition from real heat transfer coefficients (HTCs) to effective HTCs is discussed in the paper too. It is shown that core temperature of steel parts at the end of transient nucleate boiling (self-regulated thermal process (SRTP)) is a linear function of a part dimension when convective heat transfer coefficient during quenching in liquid media is fixed. Also, it is shown that effective Kondrtajev number Kn is a function of part size and convection intensity and is almost linear function for large sizes of steel parts.  Surface temperature at the beginning of self-regulated thermal process and at its end is calculated depending on size and intensity of cooling. Based on obtained new results, it is possible to design DATABASE for liquid quenchants using standard Inconel 600 probe combined with the Liscic/Petrofer probe. Obtained results can be useful for engineers and software designers. 


Keywords


SRTP characteristics; core temperature at the end of boiling; DATABASE; standard probes; software

Full Text:

PDF

References


Liscic, B., Tensi, H. M., Luty, W. (Eds.) (1992). Theory and Technology of Quenching. Springer-Verlag, Berlin, New York, 484. doi: 10.1007/978-3-662-01596-4

Kobasko, N., Aronov, M., Powell, J., Totten, G. (2010). Intensive Quenching Systems: Engineering and Design. ASTM International, West Conshohocken, 252. doi: 10.1520/mnl64-eb

French, H. J. (1930). The Quenching of Steels. American Society for Steel Treating, Cleveland, OH, 177.

Lykov, A. V. (1967). Teoriya Teploprovodnosti [Theory of Heat Conductivity]. Moscow: Vysshaya Shkola, 596.

Kobasko, N. I. (1980). Steel Quenching in Liquid Media under Pressure. Kyiv: Naukova Dumka, 206.

Kobasko, N. I. (2016). Self – regulated thermal process, its main characteristics and practical application. International Journal of Current Research, 8 (11), 41698–41704.

Kobasko, N. I. (2013). Pat. No. 109935 UA. Method for isothermal hardening of product from high-alloyed steel or cast iron. МPK: C21D 1/19, C21D 1/20, C21D 1/18. No. a201313212; declareted: 13.11.2013; published: 26.10.2015, Bul. No. 20.

Kondrat’ev, G. M. (1957). Thermal Measurements. Moscow: Mashgiz.

Tolubinsky, V. I. (1980). Heat Transfer at Boiling. Kyiv: Naukova Dumka, 315.

Kutateladze, S. S. (1963). Fundamentals of Heat Transfer. Academic Press, New York, 485.

Labuntsov, D. A. (2000). Physical Fundamentals of Power Engineering: Selected Works on Heat Transfer. Hydrodynamics and Thermodynamics, MPEI, Moscow.

Liščić, B. (2016). Measurement and Recording of Quenching Intensity in Workshop Conditions Based on Temperature Gradients. Materials Performance and Characterization, 5 (1), MPC20160007. doi: 10.1520/mpc20160007

Test Method for Determination of Cooling Characteristics of Quench Oils by Cooling Curve Analysis. doi: 10.1520/d6200-01r12

Test Method for Determination of Cooling Characteristics of Aqueous Polymer Quenchants by Cooling Curve Analysis with Agitation (Tensi Method). doi: 10.1520/d6482-06r16

Test Method for Determination of Cooling Characteristics of Quenchants by Cooling Curve Analysis with Agitation (Drayton Unit). doi: 10.1520/d6549-06r15

Kobasko, N. (2017). Cooling intensity of inverse solubility polyalkylene glykol polymers and some results of investigations focused on minimizing distortion of metal components. EUREKA: Physics and Engineering, 2, 55–62. doi: 10.21303/2461-4262.2017.00294

Kobasko, N. (2016). Investigation of batch intensive quenching processes when using hydrodynamic emitters in quench tanks. EUREKA: Physics and Engineering, 6, 29–36. doi: 10.21303/2461-4262.2016.00212

Ravnik, F., Grum, J. (2011). Heat Transfer Stages Recognition by Boiling Acoustic During Quenching. Journal of ASTM International, 8 (1), 1-13. doi: 10.1520/jai103386

Grum, J., Božič, S. (2003). Acoustic Emission During Quenching of 42CrMo4 Steel. Fourth International Conference on Quenching and the Control of Distortion.

Dorofeev, B. M., Volkova, V. I. (2005). An Acoustic Method of Investigation of the Process of Boiling. High Temperature, 43 (4), 620–627. doi: 10.1007/s10740-005-0104-6

Ganiev, R. F., Ukrainskiy, L. E. (2012). Nonlinear Wave Mechanics and Technologies- Wave and Oscillatory Phenomena on the Basis of High Technologies. USA: Begell House, 527.




DOI: http://dx.doi.org/10.21303/2461-4262.2017.00409

Refbacks

  • There are currently no refbacks.




Copyright (c) 2017 Nikolai Kobasko

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.

ISSN 2461-4262 (Online), ISSN 2461-4254 (Print)