Hi Ash and Andrew,
Here is the data sheet for Bostik Matrix FC
This is a thixotropic polyurethane. A thixotropic gel relates to how the material is applied and essentially reacts like the inverse of a non-newtonian liquid in that it becomes 'thinner' (more liquid) when stirred or agitated. I would hope this is not the case after it is cured as certain conditions in these coils can lead to recursive microphony http://www.assanpanel.com.tr/en-us/Q...s/Attach.1.pdfthis one is helpful in determining the expected temperatures due to current flow in a tightly wound coil of the material.
Rosemary contends the energy observed as increased heat (above that expected by current flow) is partially a result of matter fluctuations which increase with the mass of the wire. So according to her thesis she expects there to be an increase in heating as the wire size is increased. This result is counter intuitive because classically we expect the heat to be caused by resistive means. Where her case could be partially supported by the classical Joule heating in the cross section of a thick wire while current flow on the skin produces the necessary induction, we are still left to determine the source of the surplus heat that seems to be present.
Also, I might draw attention to your ferrite core which also serves as a thermal sink and radiator and can adversely impact the expected temperature.
Here is the data sheet for Bostik Matrix FC
This is a thixotropic polyurethane. A thixotropic gel relates to how the material is applied and essentially reacts like the inverse of a non-newtonian liquid in that it becomes 'thinner' (more liquid) when stirred or agitated. I would hope this is not the case after it is cured as certain conditions in these coils can lead to recursive microphony http://www.assanpanel.com.tr/en-us/Q...s/Attach.1.pdfthis one is helpful in determining the expected temperatures due to current flow in a tightly wound coil of the material.
Rosemary contends the energy observed as increased heat (above that expected by current flow) is partially a result of matter fluctuations which increase with the mass of the wire. So according to her thesis she expects there to be an increase in heating as the wire size is increased. This result is counter intuitive because classically we expect the heat to be caused by resistive means. Where her case could be partially supported by the classical Joule heating in the cross section of a thick wire while current flow on the skin produces the necessary induction, we are still left to determine the source of the surplus heat that seems to be present.
Also, I might draw attention to your ferrite core which also serves as a thermal sink and radiator and can adversely impact the expected temperature.






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