Chemical Vapor Deposition Reactor Design
28 May 2019 | | Contributor(s):: Adam Powell
Sketch the streamlines in a tube CVD reactor and propose a design change which would lead to more uniform deposition.
Continuous Casting Hydrostatics
28 May 2019 | | Contributor(s):: Matthew John M. Krane
A mixture of hydrostatics and the modified Bernoulli equation are used to determine the effect of fluid height in a tundish on the flow rate supplying liquid steel to a continuous casting mold.
Crystal-free Zone in a Glass-Ceramic Dish
Estimate the thickness of the crystal-free surface layer in a glass-ceramic dish by relating a heat equation solution to the T-T-T diagram.
Chemical Vapor Deposition
Calculate boundary layer sizes and deposition rate profiles along substrates on the bottom of a box-type chemical vapor deposition chamber.
Flow Through a Catalytic Reactor
16 May 2019 | | Contributor(s):: Adam Powell
Use porous flow theory to describe pressure-flow rate and plug/mixing behavior of flow through a packed bed of catalyst spheres.
Dimensional Analysis: Catalytic Combustion of Carbon Monoxide
Use dimensional analysis to understand how parameters and material properties determine uniformity of reactant gas concentration across porous spheres coated with catalysts.
Freezing by Radiation and Convection
Use radiation and a heat transfer coefficient to estimate the initial rate of solidification of the solid shell at the top of a casting while the temperature in the shell can be considered uniform, then set up the equation for mixed conduction/convection-radiation limited cooling.
Heat Conduction and Diffusion in Alloy Casting
Derive temperature and liquid concentration profiles during die casting of a roughly plate-shaped alloy part.
Coextrusion of Multilayer Polymer Sheets
Sketch the flow profile of a multilayer polymer flow through an extrusion die and beyond it, and predict the final layer thickness distribution.
Electron Beam Centrifugal Atomization of Metal
Use a heat balance to calculate electron beam power required to continuously heat and melt metal as it is atomized, including heat losses from the top surface due to evaporation and radiation.
CD Injection Molding I: Navier-Stokes
10 Apr 2019 | | Contributor(s):: Adam Powell
State simplifying assumptions which can be made regarding radial injection molding of liquid polycarbonate polymer into a CD mold, and simplify the cylindrical form of the Navier-Stokes equations accordingly.
CD Injection Molding II: Shear Stress
09 Apr 2019 | | Contributor(s):: Adam Powell
Solve the cylindrical Navier-Stokes equations simplified in Part I to give the velocity profile in radial injection molding of a CD, and calculate the shear stress based on this velocity profile.
Radiative Cooling of an Aluminum Cube
Show that radiative cooling of an aluminum cube is Newtonian (uniform temperature), and calculate time required to cool through a certain temperature range by radiation alone.
Bottom Filled Mold
07 Apr 2019 | | Contributor(s):: Matthew John M. Krane
Calculation of mold filling times, with and without a constant height of metal in a riser. Problem uses modified Bernoulli equation for the mechanical energy balance and the students are asked to determine which resistances are significant.
Cast-a-Box: Casting Conditions and Macroporosity
07 Apr 2019 | | Contributor(s):: Adam Powell
An illustration of three-dimensional finite difference simulation of heat conduction with phase change and complex boundary conditions, this requires students to adjust boundary conditions to make the top surface of a regular hexahedral "casting" to freeze last, eliminating...
A Heat Transfer Calculation
20 Mar 2019 | | Contributor(s):: Adam Powell
Outline the steps required to calculate the temperature at the interface between a stationary solid and a fluid flowing past it.