Abstract
A cylindrical copper heat pipe with a 19.5 mm outer diameter and a 400.0 mm length was filled with three different working fluids and tested for different heat inputs in the range of 100-250 W. The working fluids tested were de-ionized water, silver-water colloid, and copper water. Experimental results showed that the wall temperature reduction obtained was 3-27° C. The efficiency of the heat pipe was enhanced by 14 % as compared with the heat pipe filled with the base fluid. Furthermore, it was found that an increase in the metal fraction in copper-water nanofluids lead to enhancement in thermal efficiency of the heat pipe. Thermal conductivities of copper-water nanofluids were measured, showing a 30% enhancement with a 0.1 wt % of copper nanoparticles.
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