On departure from local thermal equilibrium in porous media due to a rapidly changing heat source: the Sparrow number

• Published in: International journal of heat and mass transfer Vol. 42; no. 18; pp. 3373 - 3385
• Main Authors: Minkowycz, W.J., Haji-Sheikh, A., Vafai, K.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.09.1999; Elsevier
• Subjects: Cooling; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Heat flow in porous media; Heat transfer; Heat transfer in inhomogeneous media, in porous media, and through interfaces; Heating; Physics; Porous materials; Thermoanalysis; Theoretical study; Rapid thermal processing; Modelling; Thermal equilibrium; Heat transfer; Porous medium

Local thermal equilibrium is an often-used hypothesis when studying heat transfer in porous media. Examination of non-equilibrium phenomena shows that this hypothesis is usually not valid during rapid heating or cooling. The results from this theoretical study confirm that local thermal equilibrium...