Modeling of Layering Ceramic Shell Mould

Abstract:

This paper presents the modeling the drying process of shell mould layering process for the ceramic shell mould fabrication process. As this process involves the repeated drying of the different wetted/saturated layers, therefore modeling of this phenomena involve a sequent approach to tackle the whole development of shell mould layering process. In this work an Ab-Initia approach was selected as the best simulation technique to map the drying mechanism. Saturation or moisture content was selected as the best parameter that will represent the drying of layering process. Using FEM with quadrilateral shape mapping of several interested points were selected to predict the moisture/saturation movement during the drying of shell layering stages. Standard drying time with 2 hours and early drying time were chosen to measure the moisture movement as layer added to the previous dried coated shell or layers. This complex mechanism of drying and penetration layering shell were then numerically solve with fully implicit backward time stepping scheme. Hopefully, this model and can be used to measure the complex movement of the main parameter i.e saturation/temperature in the drying process of multilayer system which is sometimes impossible directly measured under experimental technique

• Periodical: Applied Mechanics and Materials (Volume 232)
• Pages: 548-552
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.232.548
• Online since: November 2012
• Authors: Zawati Harun, Nazri Mohd Nawi, Mohd Faizal Batcha, David Gethin
• Keywords: Ab Initia Approach, Coupled Heat, Drying, Mass Transfer, Shell Mould Layering

References

[1] Chakrabarti, B.K., Drying Conditions and Their effect on Ceramic Shell Investment Casting Process: Material Science and Technology, v. 18, 2002, pp.935-940.

DOI: 10.1179/026708302225004775

[2] Hyde, R., The Rupture Of Ceramic Moulds for Investment Casting: PhD Theses, University of Birmingham, Brimingham, October 1995, England.

[3] Scherer, G.W., 1990, Theory of Drying, Journal America Ceramic Society, v. 73, pp.3-14.

[4] Keey, R.B., Drying Principles and Practice: Great Britain, 1975, Pergamon Press.

[5] Philip, J.R. and D.V. D.A., Moisture movement in porous materials under temperature gradients. Trans. Am. Geophys. Union, 1957. 38: pp.222-232.

DOI: 10.1029/tr038i002p00222

[6] Stanish M. A, Schajer G. S, and F. Kayihan: A mathematical model of drying for hygroscopic porous media AIChE Vol 32(8) (1986), pp.1301-1311.

DOI: 10.1002/aic.690320808

[7] Zawati Harun, D.T. Gethin, Drying Simulation of Ceramic Shell Build up Process, Second Asia International Conference on Modelling and Simulation (AMS 2008), 13-15 May 2008, Kuala Lumpur.

DOI: 10.1109/ams.2008.109

[8] Nasrallah S. B and P. P., Detailed study of a model of heat and mass transfer during convective drying of porous media. International Journal heat Mass Transfer, 1988. 31(5): pp.957-967.

DOI: 10.1016/0017-9310(88)90084-1

[9] Whitaker, S., Simultaneous Heat, Mass and Momentum Transfer in Porous Media; A Theory of Drying: Advances in Heat Transfer, v. 13, 1977, pp.119-203.

DOI: 10.1016/s0065-2717(08)70223-5

[10] Lewis, R.W., and Schrefler, B.A., 1998, The Finite Element Method in The Static and Dynamic Deformation and Consolidation of Porous Media: England, Wiley.

[11] Skorokho, V.B., Khariton, P.M., Dobryako V.M., Calculation of Nonlinear Thermal-Conductivities by Picard Method: High Temperature, v. 11, 1973, pp.621-622.

[12] Zawati Harun David Gethin, Drying (Consolidation) Porous Ceramic by Considering the Microscopic Pore Temperature Gradient, Applied Mechanics and Materials, Vol. 147, 2012, pp.210-214.

DOI: 10.4028/www.scientific.net/amm.147.210

[13] Z. Harun, Gethin, D.T., Lewis, R.W., Combined Heat and Mass Transfer for Drying Ceramic(shell) Body, The International Journal of Multiphysics, Vol 2(1), 2008, pp.1-19.

DOI: 10.1260/175095408784300270