Transient regimes temperature variation

Studies concerning the transient regime are less numerous. Pascovici et al. [16,17] have developed a ID model leading to an analytical solution when the heat flux dissipated in the film varies linearly versus time. Cicone [4] has solved numerically the ID equation of conduction in the rings and has taken into account the fluid viscosity variation versus temperature. 

Vertical Surfaces. Analyses and measurements related to transient heat transfer on vertical surfaces have been reviewed by Ede [79], For negligible solid heat capacitance, results of analyses are discussed for step changes in wall temperature and in surface heat flux, and for periodic specified temperature or flux, as well as for other prescribed variations. Most recent analyses have confirmed the estimate of Siegel [252] that the local time for departure from the conduction regime at distance position x from the leading of a vertical flat plate after a step change in wall temperature is... 

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