NDLI: Measurement of Kinetic Zone Temperature and Heat Transfer Coefficient in the Lost Foam Casting Process

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Liu, X. J. Bhavnani, S. H. Overfelt, R. A.
Copyright Year	2004
Abstract	A thermometric technique has been developed to study the thermal characteristics of the foam-metal interaction in the lost foam casting process. A cylindrical foam pattern and heated steel block have been used to estimate the endothermic losses associated with the thermal degradation of the expanded polystyrene at the metal front. Thermocouple readings have been analyzed to determine the temperature of the kinetic zone between the advancing metal front and the receding foam pattern. The heat transfer coefficient between the metal front and the foam pattern has been calculated from the thermal data at the simulated metal front. The results confirmed that the endothermic degradation of the polystyrene pattern at the metal front introduced a steep thermal gradient in the metal and a consistently increasing heat flux. It is found that the heat transfer coefficient, initially 150 W/m2·K increases to 220 ~ 300 W/m2·K during the process. Foam density has marginal effect on the heat flux and heat transfer coefficient, whereas the increase of simulated metal front velocity enhances the heat transfer at the metal front. The kinetic zone temperature is measured to be in the range of 150 to 290°C with an average of 200°C and a gaseous gap size of 1 to 4 cm.
Sponsorship	Heat Transfer Division
Starting Page	411
Ending Page	418
Page Count	8
File Format	PDF
ISBN	079184711X
DOI	10.1115/IMECE2004-59348
Volume Number	Heat Transfer, Volume 3
Conference Proceedings	ASME 2004 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2004-11-13
Publisher Place	Anaheim, California, USA
Access Restriction	Subscribed
Subject Keyword	Casting Temperature Metals Thermocouples Steel Heat transfer coefficients Density Heat flux Heat transfer Temperature gradient
Content Type	Text
Resource Type	Article

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