Recent content by swilly

Okay, so I treated it as a system and added the heat resistances, or R-values: \dot{Q} = \frac{1173K-Tb}{Rtotal} I calculated Rtotal by adding the R-values for the conductive layers with the R-value for radiation (radiation from the outside of the oven to the walls of the vacuum). I...

The ceramic cylinders are made of Alumina, so I can find the conductivity. I have a lot of time to heat it up. Can anyone help me with the math to estimate the current?

So, as it heats up, I will need less and less current? Basically, I'm just trying to estimate the current required to keep the sample of metal at the center at 900 deg C. I'm confused on how I calculate thermal radiation and conductivity. I realize that every part of the system is going emit...

I was given an oven that comprises of several cylinders that fit inside one another. The innermost cylinder is a Molybdenum oven that will hold a sample of metal. A ceramic cylinder fits over this. A tungsten wire heating element is wrapped around this cylinder. Two more ceramic cylinders fit...