Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Coupled Integral Equations Approach on the transient heat transfer problem in supercritical fluids
Submission Author:
Pedro Perroni Rezende Machado , RJ
Co-Authors:
Leonardo Santos de Brito Alves, Pedro Perroni Rezende Machado
Presenter: Pedro Perroni Rezende Machado
doi://10.26678/ABCM.COBEM2017.COB17-2911
Abstract
This work aims to use the Coupled Integral Equations Approach (CIEA) to simplify the transient heat transfer problem in supercritical fluids, and to compare these solutions with results obtained by the Generalized Integral Transform Technique (GITT). It is shown that for certain combinations of boundary conditions there exists a transient overheating in the fluid, which raises the bulk temperature above the steady state temperature. The CIEA formulations with low order of approximations present good results in the absence of overheating, but are unable to capture the bulk temperature profile that exists on its presence. On the other hand, the solutions using higher orders of approximation show the transient overheating and present good results with respect to the the solutions obtained by the GITT. A non-orthogonality analysis is done for the simplified equations obtained by the CIEA formulation in an attempt to justify why this ability of capturing the overheating is only present in the higher order approximations.
Keywords
CIEA, supercritical fluids, piston effect
