Search results for "Thermal convection"

showing 3 items of 3 documents

Theoretical study of a Bénard Marangoni problem

2011

[EN] In this paper we prove the existence of strong solutions for the stationary Benard-Marangoni problem in a finite domain flat on the top, bifurcating from the basic heat conductive state. The Benard-Marangoni problem is a physical phenomenon of thermal convection in which the effects of buoyancy and surface tension are taken into account. This problem is modelled with a system of partial differential equations of the type Navier-Stokes and heat equation. The boundary conditions include crossed boundary conditions involving tangential derivatives of the temperature and normal derivatives of the velocity field. To define tangential derivatives at the boundary, intended in the trace sense,…

Bénard–Marangoni problemPartial differential equationMarangoni effectIncompressible Boussinesq–Navier–Stokes equationsApplied MathematicsMathematical analysisBoundary (topology)INGENIERIA AEROESPACIALWeak formulationDomain (mathematical analysis)Physics::Fluid DynamicsIncompressible Boussinesq-Navier-Stokes equationsFluid dynamicsFree boundary problemThermal convectionBenard-Marangoni problemHeat equationBifurcationBoundary value problemAnalysisMathematics
researchProduct

Influence of Skin Depth on Convective Heat Transfer in Induction Heating

2017

International audience; We investigate convection driven by induction heating of a horizontal fluid layer using direct numerical simulations (DNS). This problem is of particular interest in the context of nuclear severe accident mastering. In a real severe accident, the molten core is subjected to homogeneous internal sources resulting from nuclear disintegrations. This situation is mimicked in the laboratory using induction heating as the internal source. In induction heating, however, heat sources are localized in the skin layer. Consequently, this concentration of heat may modify the flow and wall heat transfer compared to the case of homogeneous internal sources. DNS are carried out for…

ConvectionInduction heatingConvective heat transferMHDDNS020209 energyMécanique des fluidesFlow (psychology)General Physics and AstronomyThermodynamicsContext (language use)02 engineering and technology01 natural sciences010305 fluids & plasmas[CHIM.GENI]Chemical Sciences/Chemical engineering0103 physical sciences0202 electrical engineering electronic engineering information engineeringThermal convectionNumerical simulationsElectrical and Electronic EngineeringInduction heatingCritical heat fluxChemistryMechanicsCore (optical fiber)Heat transfer
researchProduct

Measurement of the Convective Heat-Transfer Coefficient

2014

We propose an experiment for investigating how objects cool down toward the thermal equilibrium with its surrounding through convection. We describe the time dependence of the temperature difference of the cooling object and the environment with an exponential decay function. By measuring the thermal constant tau, we determine the convective heat-transfer coefficient, which is a characteristic constant of the convection system.

Thermal equilibriumConvectionPhysicsNatural thermal convectionPhysics - Physics EducationFOS: Physical sciencesGeneral Physics and AstronomyHeat transfer coefficientMechanicsLaboratory experiments and apparatusEducationPhysics::Fluid DynamicsPhysics Education (physics.ed-ph)Temperature differenceExponential decayConstant (mathematics)Thermal constantNatural thermal convection; Laboratory experiments and apparatus
researchProduct