DOI: 10.1615/ICHMT.2012.CHT-12
ISBN: 978-1-56700-303-1
ISSN: 2578-5486
PRESSURE WORK AND VISCOUS DISSIPATION INFUENCES ON FLOW ENERGY AND ENTROPY BALANCES
RÉSUMÉ
The contributions of pressure work and viscous dissipation to heat transfer by natural convection in a closed cavity that may have a sliding lid have been estimated numerically to determine how they interact with the flow and heat transfer processes. By using a computational method that has been carefully constructed to guarantee algebraic conservation it has been shown that the pressure work and viscous dissipation contributions, although very small, do satisfy a first law analysis of the problem in that their difference is equal to the work done by the moving lid. In order to achieve this balance and to correctly represent the fluid dynamics and heat transfer, both pressure work and viscous dissipation must be included in numerical models.