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Originally Posted by UNDERBYTE
Looks to me they defined thier own Internal resistivity for the paper. Maybe I am missreading it.
Read section B
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Follow the math, not the words (which in that paper are somewhat confusingly worded).
160W/cm² for a 32C rise (over a 1cm² area)
32/160 = 0.2 °C/(W/cm²) (Total Resistivity)
Note their extensive switching between the Total Resistivity and Internal Resistivity terms, often quoting the latter.
The "Internal Resistivity" is the resistivity of the waterblock itself, not accounting for the thermal disjunction between the heat-source and the waterblock. It is, in essence, what BillA once coined as T/W.
The "Internal Resistivity" of a White Water is conjectured to be around 0.08-0.09 °C/(W/cm²) at 10LPM.