Heat Transfer and Reflectivity?
Heat Transfer and Reflectivity?
(OP)
Hi All,
I have an application, with mostly aluminum parts. I have a central block that is water cooled. I have exterior parts that are bolted to the central block. I do not want to impede the heat transfer from the outside block to the inside cooling block. However, I would like to plate the parts so that I can increase reflectivity. I want to reflect as much heat as possible. This is a welding head, so close proximity to the heat source. I was going to use an electroles Nickel coating for reflectivity but I haven't been able to find any info on thermal conductivity? I want to make sure I don't insulate the mating surfaces. I would have to mask the plating if the plating hurts the transfer. Any suggestions or comments appreciated.
I have an application, with mostly aluminum parts. I have a central block that is water cooled. I have exterior parts that are bolted to the central block. I do not want to impede the heat transfer from the outside block to the inside cooling block. However, I would like to plate the parts so that I can increase reflectivity. I want to reflect as much heat as possible. This is a welding head, so close proximity to the heat source. I was going to use an electroles Nickel coating for reflectivity but I haven't been able to find any info on thermal conductivity? I want to make sure I don't insulate the mating surfaces. I would have to mask the plating if the plating hurts the transfer. Any suggestions or comments appreciated.
Thanks
Bill





RE: Heat Transfer and Reflectivity?
RE: Heat Transfer and Reflectivity?
Thanks
Bill
RE: Heat Transfer and Reflectivity?
The thermal conductivity of an electroless nickel deposit containing 8 to 9 percent phosphorus is 0.0105 to 0.0135 cal/cm/sec/°C. Electrodeposited nickel has a value of 0.19 to 0.26 cal/cm/sec/°C.
I found the above on a website, converting 7954 W/mk = 0.19 cal/cm/sec/C. That must be wrong, higher than silver?
Thanks
Bill
RE: Heat Transfer and Reflectivity?
However, when you look at the thermal conductance of a 5 micron thick layer of nickel, you get 16 MW/m^2-K, i.e., its conductance is absurdly large relative to the more pithy problem of contact resistance.
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RE: Heat Transfer and Reflectivity?
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