Numerical Simulation of Double Diffusive Mixed Convection in a Horizontal Annulus with Finned Inner Cylinder

Abstract

The present work relates to a numerical investigation of double diffusive mixed convection around a horizontal annulus with a finned inner cylinder. The solutal and thermal buoyancy forces are sustained by maintaining the inner and outer cylinders at uniform temperatures and concentrations. Buoyancy effects are also considered, with the Boussinesq approximation. The forced convection effect is induced by the outer cylinder rotating with an angular velocity (ω) in an anticlockwise direction. The studies are made for various combinations of dimensionless numbers; buoyancy ratio number (N), Lewis number (Le), Richardson number (Ri) and Grashof number (Gr). The isotherms, isoconcentrations and streamlines as well as both average and local Nusselt and Sherwood numbers were studied. A finite volume scheme is adopted to solve the transport equations for continuity, momentum, energy and mass transfer. The results indicate that the use of fins on the inner cylinder with outer cylinder rotation, significantly improves the heat and mass transfer in the annulus.

Flow topology and bifurcations of buoyancy and mixed convection in an elongated channel with an abrupt section variation

“…Evidence for such behaviors can be found in chemical and energy production plants, environmental control devices, heat exchangers of various types, cooling systems for electronic devices and nuclear reactors, combustion chambers and cooling passages in turbine blades, etc., see, e.g., Sun and Jaluria [34]; Arrif et al [35]; Nadjib et al, [36]; Lappa [37]). All these technological problems consistently bare the presence of thermal buoyancy convection and related instabilities, which require a proper understanding of the underlying mechanisms.…”

Simulation of the Hydraulic Behavior of a Bionic-Structure Drip Irrigation Emitter

“…The fluid flow relies on the steady-state conservation equations for mass and momentum in a fluid, which are given by [24,25]:…”

Influence of Electrical Field Distortions Induced by Water Droplets on the Contamination Characteristics of an Insulator

“…In recent years, with the development of computer technology, numerical simulation technology has gradually matured [15][16][17][18][19]. Compared with the experiments, numerical simulations of the insulator are mainly based on hydrodynamics, low-frequency electromagnetic field and particle two-phase flow to study the deposition process and adhesion mechanism of contaminated particles.…”