Exprimental Investigation of the influence of nanofluid on the heat performance of pulsating heat pipe

One of the challenges facing engineers in the industry is high performance cooling systems. Pulsating heat pipe is suitable method for eliminating this concern. Besides, Nanofluid has attracted attention due to higher thermal conductivity and high thermal transfer properties in recent years. The performance of Pulsating heat pipes is based on the fluid phase change. In this paper, we analyze a prototype of pulsating heat pipe. The designed model is consist of 6 loops copper pipes with 2.2 mm inner diameter and 4 mm external diameter .Each loop is 280 mm that lengths of the evaporator and condenser are both 100 mm and height of adiabatic section is 80 mm. A two-step method of making nanoparticles and nano fluids with fill ratio of 60% is used and Fero fluids Fe3O4 mass concentration was varied at four levels (0.1, 0.3, 1, and 3).It was shown that the thermal resistance decreases with increasing input power, The results showed that thermal performance of nano fluid is better than pure water and the best performance is noticed in case of 1% mass concentration of nanofluid.