Journal of Applied Science and Technology

Log in or Register to get access to full text downloads.

Remember me or Register

DOWNLOAD FULL TEXT Open Access  DOWNLOAD FULL TEXT Subscription or Fee Access

Periodic heat wave determination of thermal diffusivity of clays

AK Kisiedu, AAI Gyeabour


The responses of Ankaful, Tetegu (# 1 & 2) and Mamfe clays to periodic heat waves were analyzed to deter-mine the thermal diffusivity values. The temperature amplitude attenuated with depth of penetration, while the phase shift increased. The thermal diffusivity values ranged from 3.0 - 9.5 x 10P-7P mP2P/s by amplitude decay and phase lag calculations based on Fourier theory of heat conduction. The large variation in the thermal diffusivity was attributed to non-homogeneity of the clay samples. The damping depths, heating and cooling rates were evaluated to identify most suitable clay samples for construction of kilns and furnaces for high temperature ind-ustrial applications. Tetegu # 1 and Mamfe clays exhibited characteristics of high thermal diffusivity, heat rete-ntion and depth of penetration, and were considered as suitable processing refractory media.
AJOL African Journals Online