The Effect of Real and Averaged Boundary Conditions on the Cooling Rate for the Simulation of Heat Treatment Processes

Abstract:

The paper deals with problems of computer modelling of heat treatment processes. The effect of the choice of the coefficient of heat transfer between the coolant and components was quantified. The oil Isorapid HM 277 was chosen as the coolant. Two cases of application of the convective boundary condition were studied through numerical experiment. In the first of the cases, a real functional dependence of the heat transfer coefficient (HTC) was applied on the surface temperature. In the second case, it was used constant and temperature independent values of HTC on the surface temperature. Cooling curves were obtained through numerical experiment. Derived variables such as cooling rate, the density of the thermal flows are shown in the paper. Code ANSYS was used as interpretative tool of the numerical experiment.

• Periodical: Applied Mechanics and Materials (Volume 693)
• Pages: 299-304
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.693.299
• Online since: December 2014
• Authors: Štefan Hajdu, Bohumil Taraba
• Keywords: ANSYS, Computer Modelling, Cooling Rate Curve, Heat Transfer Coefficient, Heat Treatment

References

[1] Ansys Theoretical Manual (2011). from http: /www. pdfqueen. com/pdf/an/ansys-10-users-manual/10/, accessed on 2011-11-18.

[2] Bodin, J., Segerberg, S., Lövgren M. (2005).

[3] Incropera, F., P., Dewitt, D. (1996). Fundamentals of heat and mass transfer. John Wiley & Sons. New York.

[4] Origin 8. 0. from http: /www. origin-8. com, accessed on 2013-03-12.

[5] Petrofer Hildesmein (2011). from http: /www. norteks. ru/en/product/petrofer/branded_items/harden_comp/, accessed on 2011-11-18.

[6] Troell, E., Kristoffersen, H., Bodin, J. Segerberg, S., Felde, I. (2007). Unique software bridges the gap between cooling curves and the result of hardening. Carl Hanser Verlag, Munchen, pp.110-115.

DOI: 10.3139/105.100414

[7] Taraba, B., Duehring, S., Španielka, J., Hajdu, Š. (2012). Effect of Agitation Work on Heat Transfer during Cooling in Oil ISORAPID 277HM. In: Strojniški vestnik - Journal of Mechanical Engineering. ISSN 0039-2480. Vol. 58, No. 2, pp.102-106.

DOI: 10.5545/sv-jme.2011.064

[8] Taraba, B., Španielka, J. (2010). Combined heat transfer coefficient calculation for cooled probe to 850 °C in quenching oil. The international conference of the Carpathian Euro-region specialists in industrial system, pp.281-286.

[9] Totten, G.E., Werster, G.M., Tensi H.M., Liscic, B. (1997). Standards for Cooling Curve Analysis of Quenchants. Heat Treatment of Metals, vol. 4, pp.92-94.