This tutorial is uses the same geometry as CVD Chamber Mixing, but focuses on heat transfer with radiation. Radiation plays an important role within confined geometries where radiative surface properties vary greatly. In this modeling effort, we concentrate on obtaining the temperature distribution inside
and on the walls of the chamber when a constant heat flux of 3000 W/m2
is generated at the lower surface of the pedestal.
For high-pressure thermal plasma sustained by direct current, the temperatures of electrons and gases may differ from each other. A 2-temperature approach better accounts for the overall phenomena than the 1-temperature model, in which the thermal equilibrium of electron and heavy species are assumed.The 2-temperature plasma model in CFD-ACE+ includes the electric conduction solution and the sheath model to account for voltage drop. A validation study of the model for a 2-D axi-symmetric (but in 3-D set-up) free burning arc in atmospheric Argon is presented.
The goal of this tutorial is to demonstrate simulations of a 3D ICP with
the complex shape of the coil. Engineering problems frequently contain embedded objects or components that are pre-dominantly one-dimensional, i.e., long and slender and with transverse length scales that are much smaller thanthe isotropic length scales of the multi-dimensional space in which the objects are embedded.Those objects are called filaments. Examples include micro-channels, in fluidic devices, optical or electrical leads, resistive electric micro-heaters, or conducting paths in micro-chips.
This tutorial sets up simulations of thermally inductively coupled plasma at atmospheric pressure including effects of radiation heat transfer and conjugated flow/wall heat transfer. The tutorial employs the power of user subroutines to define the properties of the Argon gas found in the plasma tube. The relative permittivity, electrical conductivity, specific heat and thermal conductivity of the Argon gas are set using the user subroutines.
The steady state conductive heat transfer to the air-gap between infinitely long concentric thick-walled cylinders is modeled and compared with an analytical solution. This is a step-by-step guided introductory tutorial for setting up a heat transfer model in CFD-ACE+.
In certain applications, different regions of the computational domain experience flow conditions that are so different that it is very difficult for a single solver to produce accurate results at the extremes. In many situations, such problems can be separated and solved using loosely coupled solvers. Each solver is chosen to provide highly accurate solutions for the prevailing flow conditions.
ESI's CFD-FASTRAN, a compressible flow solver, is ideally suited for high speed external aerodynamics problems and the multi-physics solver CFD-ACE+ is ideally suited for heat transfer problems involving conduction, convection (natural and forced) and radiation.
A large amount of aerodynamic heating is generated over hypersonic vehicles during re-entry. Thermal Protection System (TPS) materials are employed to prevent the heating from conducting into the internal cabin, which holds electronic devices, passengers and other vital components. As a time-dependent process, the material making up TPS is at a low temperature and “soaks up” the heat – the conductivity of the material transports the heat (from the vehicle surface) through the thickness. The material will also re-radiate some of the heat back to the flow – the amount depending on the emissivity of the material. A primary concern is to estimate the effects of aeroheating on the internal volume of the capsule and its effect on electronic devices, passengers and cooling systems. In this application, typically the external flow is hypersonic in nature, whereas the flow within the capsule is a very low speed flow dominated by natural convection. In addition, to hypersonic aerodynamic heating, several other physics including heat conduction, natural convection and radiation has to be accurately modeled. CFD-FASTRAN solves for the external hypersonic flow and CFD-ACE+ solves for heat conduction, convection and radiation. Exchange of heat flux/temperature data between FASTRAN and ACE occurs at defined interfaces.
Axisymmetric inductively coupled plasma reactor used for SiO2 deposition in Ar/O2/SiH4 is modeled. The
operating conditions are Pressure = 10 mTorr, Dimension (nozzle to wafer) of 16
cm, RF coil current = 15 A, 13.56 MHz, sonic inlet for Ar/SiH2/O2 and wall
temperature of 300 K.
Turbulent combustion of co-injected jets of propane and air is studied in an axisymmetric combustor. The combustion process is modeled using a multi-step gas phase reaction mechanism. CFD-ACE+ provides several reaction models that can be used to study combustion depending of the objectives of the study.
This tutorial demonstrates coupled electrical/thermal/structural analysis of a wirebond for power electronic devices. Current flowing through the wires causes heating, which in turn results in thermoelastic stresses in the wires and at the locations where the wire is connected to the IGBT and the diode. Here, we model all three aspects and predict the wire temperature and stress levels.
This is a step-by-step guided
introductory tutorial for setting up a heat transfer model in CFD-ACE+. The steady state conductive and natural convective heat transfer to the air-gap between
infinitely long concentric thick-walled cylinders is modeled. The inner and outer
walls are maintained at a fixed temperature. The goal of the simulation is
to determine the heat transfer required to maintain the inner and
outer walls at fixed temperatures.
