This paper presents preliminary experimental results on using copper tube having internal and external diameter with 2.4mm and 3mm, respectively, to carry out the experimental pulsating heat pipe. The working fluids include the silver nano-fluid water solution and pure water.
In order to study and measure the efficiency, we compare with 20nm silver nano-fluid at different concentration (100ppm and 450ppm) and various filled ratio (20%, 40%, 60%, 80%, respectively), also applying with different heating power (5W, 15W, 25W, 35W, 45W, 55W, 65W, 75W, 85W, respectively). According to the experimental result in the midterm value (i.e. 40%, 60%) of filled ratio shows better. In the majority 60% of efficiency is considered much better. The heat dissipation effect is analogous in sensible heat exchange, 60% has more liquid slugs that will turn and carry more sensible heat, so in 60% of filled ratio, heat dissipation result is better than 40%, and the best filled fluid is 100ppm in silver nano-fluid.
Finally, we observed through the measurement comparison in thermal performance with pure water. When the heating power is 85W, the average temperature difference and the thermal resistance of evaporator and condenser are decreased by 7.79ยฐC and 0.092ยฐC/W, respectively.