R. Aghayeri - Shahrood Branch, Islamic Azad University, Shahrood, I.R. Iran
H. Maddah - Department of Chemistry, Sciences Faculty, Arak Branch, Islamic Azad University, Arak, I.R.Iran
F. Ashori - Shahrood Branch, Islamic Azad University, Shahrood, I.R. Iran
M. Aghili - Shahrood Branch, Islamic Azad University, Shahrood, I.R. Iran

In this work, the characteristics of flow and heat transfer of a fluid containing nano particles of aluminum oxide with the water volume fraction (۰.۱-۰.۲-۰.۳)(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 ۲۰ 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 ۵-۱۲ 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.

Nano particles, Double-pipe, Heat Exchanger, turbulent flow, Heat transfer coefficient