The effects of thermal boundary condition on flow at supercritical pressure
Hassan Nemati (TU Delft - Aerospace Engineering)
Ashish Patel (TU Delft - Mechanical Engineering)
Bendiks Jan Boersma (TU Delft - Mechanical Engineering)
Rene Pecnik (TU Delft - Mechanical Engineering)
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Abstract
Fluids at supercritical pressure undergo a continuous phase from a liquid to a gas state if the fluid is heated above the critical pressure. During this phase transition the thermophysical properties of the fluid vary significantly within a narrow temperature range across the pseudo-critical temperature T pc Tpc
(pseudo-critical temperature is defined as the temperature at which the specific heat at constant pressure (c p cp
) attains its peak value). Figure 1 shows the variation of thermophysical properties of CO 2 2
at a thermodynamic supercritical pressure P 0 P0
= 80 bar (P critical =73.773bar Pcritical=73.773bar
) as a function of temperature (Int J Thermophys 24, 1–39 (2003)) [1]. These characteristics make supercritical fluids appealing in many industrial applications, such as: desorption, drying and cleaning in extraction processes; pharmaceutical industry; in power cycles as working fluids (Renew Sustain Energy Rev 14, 3059–3067 (2010)) [2] , (Nucl Technol 154, 283–301 (2006)) [3] and biodiesel production ( Fuel 80, 225–231 (2001)) [4].