So, I'm doing a group project for a materials and manufacturing engineering class, where our job is to make a product using injection molding. For our project, we chose a sphere (keeping it simple)
I'm in charge of calculating cooling time for the part while its in the mold. Herein lies the issue:
I have to figure out how heat (power) flows through our mold, Which can be represented by a hollow sphere in a perfect cube.
The equation for thermal conductivity is (K)(A)(T2-T1)/(L), Where L is the parallel distance of hard object in which the heat has to flow. This equation is set up for a solid, uniform plate, The problem is that the object in which the heat must flow is NOT a uniform object!
So what do I set L as?
I have Schaum's outline for college physics, and it allows me to define the rest of the parameters. I just need L.
Also, another question: Our mold is being 3-D Printed, to where the mold isn't truly a solid object; a certain percent is plastic (Given by % infill) and the rest as air. I believe I got the K-value correct for this part but I would like to backcheck -> ((%infill)(K-PLA)) + (100-%infill)(K-air) = K-incomplete_infill