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Chemical Engineering Science, Vol. 45, No. 7, pp. 1719-1731.1990. ooo9-2509/90 53.00 + 0.00 Printed in Grca~ Britain. Q 1wo Pergamon Press plc
 

Summary: Chemical Engineering Science, Vol. 45, No. 7, pp. 1719-1731.1990. ooo9-2509/90 53.00 + 0.00
Printed in Grca~ Britain. Q 1wo Pergamon Press plc
SIMULTANEOUS MOMENTUM, HEAT AND MASS
TRANSFER WITH CHEMICAL REACTION IN A DISORDERED
POROUS MEDIUM: APPLICATION TO BINDER REMOVAL
FROM A CERAMIC GREEN BODY
GREGORY C. STANGLE and ILHAN A. AKSAY
Department of Materials Science and Engineering, and Advanced Materials Technology Center,
Washington Technology Centers, University of Washington, Seattle, WA 98195, U.S.A.
(First received 27 December 1988; accepted in revised form 4 December 1989)
Abstract-A theoretical model has been developed to describe simultaneous momentum, heat, and mass
transfer phenomena in disordered porous materials. The model can be applied to a wide variety of
engineering-related fields, e.g., the drying and/or burnout of processing aids in the colloidal processing of
advanced ceramic materials. Simulations based on the model predict the local temperature and mass
distribution of the porous body as a function of time and position. This information can then be coupled
with known mechanical properties of the body to predict internal stresses generated during removal of
liquid from the body. The theoretical model has potential application to many engineering problems, e.g.,
the optimization of processing conditions in the design of an improved binder removal process. The model
is evaluated using experimental data on binder removal from a ceramic green compact consisting of
submicron a-Al,O, powder dispersed in a paraffin wax; the agreement between the simulated and

  

Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University

 

Collections: Materials Science