Heating of Magnesium Plates By: Jonathan Scott

Introduction

The Problem Constant temperature profile needed Press pulls away too much heat

Desired failure mode Undesired failure mode

Assumption No contact resistance between press and magnesium plate Lumped Capacitance Room temperature = 298 K Open convection on all exposed surfaces

The Solution Tmax = 150 C or roughly 425 K Tf = 362 K Ra = 4.35x10^5 Nu top = 13.86 Nu bottom = 6.93 h = 14.83 W/mK Heat loss thru Natural Convection = 39.9 W Heat loss thru Conduction = 63.3 W

Conclusion Total Heat loss = 103.2 W 103.2 W must be applied at the press to increase Ts at that point