the experimental study of nanoparticles effect on thermal efficiency of double pipe heat exchangers in turbulent flow

in this work, the characteristics of flow and heat transfer of a fluid containing nano particles of 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 temperature increases and heated (author) nano-fluid heat transfer coefficient is greatly influenced. the use of nano-fluid pressure may cause slight errors in the calculation.