Abstract
This paper presents the study of functional limits of heat pipes with MgO deionized (DI) water nano fluid as working fluid. The nano fluid is made with the help of two step method and it is surfactant free. The output has been analyzed with the increase in concentrations of MgO / DI water nano fluid (0.005%, 0.025% and 0.05 %) and at power input of (10 W, 30 W & 60 W), for covering operational range temperature of the electronic instruments. (<600C). On the basis of the thermo physical properties of the MgO/DI water nano fluid, the functional limits of heat pipe are determined. The changed of working fluids shows an improvement in boiling, pick up(entrainment), viscous and sonic limit except the capillary limit of heat pipe. The surfactant free nano fluids give good safety margin to the boiling limit of the heat pipe, with elimination of chances of locking due to vapor. The capillary limit reduces by the application of nano fluids due to increase in the vapor and liquid flow path resistance rather than capillary pressure in the evaporator section of heatpipe.
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