فهرست مقالات turbulators دسترسی آزاد مقاله صفحه چکیده متن کامل 1 - Increasing the Heat Transfer Performance of a Turbulator Equipped Concentric Gas-liquid Heat Exchanger Using Al2O3 – Water Nanofluid seyyed rahim hosseini Seyyed Masoud Seyyedi Mehdi Hashemi Tilenoee