“…Recent interest to this phenomenon has been motivated by its importance for the transport processes in tissues (Levitt, 1972;Fallon and Chauhan, 2005), column inverse gas chromatography (Hamdan et al, 2005), geothermal heating systems (Ortan et al, 2009) and micro-fluidic devices (Ajdari et al, 2006;Vikhansky, 2008;Vikhansky, 2009). Transport of an inert gas in tissues and blood vessels, for example, has long been utilised as a means to measure tissue blood perfusion (Kety, 1951;Sejrsen and Tonnesen, 1968).…”