Abstract:
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A numerical study of the thermal and fluid-dynamic behaviour of the two-phase flow inside ducts working
under cryogenic conditions, coupled with the analysis of a phase change material PCM accumulator is
presented. The numerical analysis is based on: i) a one-dimensional and transient integration of the
conservative equations (mass, momentum and energy) in case of the fluid flow inside tubes, and ii) a twodimensional
and transient integration of the conservative equations in case of the PCM accumulator. The
discretization of the governing equations has been developed by means of the finite volume technique. The
discretized governing equations are solved using a Semi-Implicit Method for Pressure-Linked Equations
(SIMPLE). The two-fluid model has been used to simulate the two-phase flow phenomena inside tubes,
which is an inter-penetrating model capable to define the behavior of the velocity, the pressure, the
temperature and the distribution of each one of the phases (gas and liquid), separately. A group of
parameters, used in the numerical model proposed, are evaluated by means of empirical correlations, which
have been obtained from the technical literature in the cryogenic field. Numerical results of the whole system
are shown, where the temperature distribution of the fluid flow, the wall pipe, and the PCM accumulator are
presented |