How to measure thermal conductivity of Fins in heat sink or heat exchanger.
Thermal Conductivity: A measure of the ability of a material to transfer heat. Given two surfaces on either side of a material with a temperature difference between them, thermal conductivity is the heat energy transferred per unit of time and per unit of surface area, divided by the temperature difference (T). Thermal conductivity is a bulk property that describes the ability of a material to transfer heat.
Three classes of methods exist to measure the thermal conductivity of a sample: steady-state, time-domain, and frequency-domain methods.
In general,
Steady-state-Steady-state techniques perform a measurement when the temperature of the material measured does not change with time.
K= Q.Δx/A.ΔT
Time-domain methods
- The transient techniques perform a measurement during the process of heating up. The advantage is that measurements can be made relatively quickly. Transient methods are usually carried out by needle probes
Transient hot wire method
The transient hot wire method (THW) is a very popular, accurate, and precise technique to measure the thermal conductivity of gases, liquids, solids, nanofluids (hybrid Fluids), and refrigerants in a wide temperature and pressure range
Surely it's easier to just see what they're made of?
If you want to measure the performance of the heat sink as a convective dissipating element, that's a very different question.
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