DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf
ISBN Print: 978-1-56700-262-1
ISSN: 2377-2816
Direct numerical simulation of turbulent heat transfer to water at supercritical pressure flowing in vertical pipes
要約
Turbulent heat transfer to water at supercritical pressure flowing in vertical pipes is investigated using direct numerical simulation. A conservative space-time discretization scheme for variable-density flows at low Mach numbers is adopted in the present study to treat steep variations of fluid properties at supercritical pressure just above the thermodynamic critical point. The fluid properties at these conditions are obtained using PROPATH and provided in the form of tables for the simulations. The buoyancy influence induced by strong variation of density across the pseudo-critical temperature proves to play an important role in turbulent flow and heat transfer at supercritical state. Depending on the degree of buoyancy influence, turbulent heat transfer may be enhanced or significantly deteriorated, resulting in local hot spots along the heated surface. The influence of turbulent buoyancy production depending on the inlet temperature results in different turbulent structures near the wall region.