TheExperimentalStudy ofNanoparticlesEffectonThermalEfficiency ofDoublePipeHeatExchangers inTurbulentFlow

In this work, the characteristics of flow and heat transfer of a fluid containing nano particlesof aluminum oxide with the water volume fraction (0.1-0.2-0.3)(V/V) percent of the reports. The overall heat transfer coefficient, heat transfer and the average heat transfer fluid containing nano water - aluminum oxide in a horizontal double pipe counter flow heat exchanger under turbulent flow conditions is studied. In the present study, aluminum oxide nanoparticles with a diameter of about 20 nm are used. The results show that the overall heat transfer coefficient and the overall heat transfer fluid based on nano-fluid heat transfer coefficient is slightly higher (up to about 5-12 percent).Nano-fluid heat transfer coefficient and average heat transfer increased with nano-fluid mass flow rate increases with increasing temperature and water nano-fluid, fluid temperatureincreases and Heated (Author) nano-fluid heat transfer coefficient is greatly influenced. Theuse of nano-fluid pressure may cause slight errors in the calculation.