Heat Transfer Coefficient

Air - https://www.engineeringtoolbox.com/convective-heat-transfer-d_430.html

Metal - https://www.engineeringtoolbox.com/thermal-conductivity-metals-d_858.html

https://www.engineeringtoolbox.com/overall-heat-transfer-coefficient-d_434.html

Overall heat transfer - https://www.engineeringtoolbox.com/overall-heat-transfer-coefficient-d_434.html

Notes on Extruder Design

• If we assume that metal takes heat out much faster than air - then the heat break should be metal-cooled, not air-cooled. This is found in E3D Titan Aero - where metal sucks the heat from the heater to provide a short transition zone. This is not found in the J-Head, where there is a longer transition zone?