Numerical Simulation on the Flow and Heat Transfer of Supercritical CO₂ in Sudden Expansion Pipe under Cooling Condition

Flow and Heat Transfer Characteristics Downstream of a Porous Sudden Expansion: a Numerical Study

Incompressible, axisymmetric laminar flow downstream of a porous expansion is simulated. Effect of the Darcy number and inertia coefficient on flow and heat transfer characteristics downstream of the expansion is investigated. The simulation revealed circulation downstream of the expansion. Decreasing the Darcy number is shown to decrease the circulation region. The Nusselt number, friction coe...

Numerical Simulation of Flow and Heat Transfer of Fluids at Supercritical Pressure

Simple geometries such as circular pipes or annular channels have been used to investigate the heat transfer experimentally in the vicinity of the pseudo-critical temperature using water or CO2. A large database exists worldwide. In these experiments large deviations from the ‘normal’ heat transfer behaviour were documented, in particular a strong dependency of the heat transfer coefficient on ...

numerical simulation of turbulent flow and heat transfer in a b-type section pipe with porous bottom wall

in this work, three-dimensional turbulent forced convection flow through a b-type section pipe, which porous material inserted at the bottom wall, is investigated numerically. the b-type section pipe are used in cooling systems, such as cars’ radiators. the main purpose of this research is to enhance heat transfer and to reduce the scales of such systems. the governing equations are formulated ...

Physical Modelling of Self-Aeration in a Cavitating Sudden PIPE Expansion Flow

Sudden pipe expansions have been known as efficient hydraulic energy dissipaters for a long time. The complex phenomenon of flow separation and velocity discontinuity at the interface of incoming jet and the recirculation flow, results in intensive shear and tensile rupture of the fluid and the associated destructive phenomenon of cavitation. This paper focuses on aeration in sudden pipe expans...

Numerical Investigation of the Flow and Heat Transfer within the Core Cooling Channel of a Supercritical Water Reactor