Enhancement of turbulent heat transfer by using CuO nano-particle and twisted tape

Mohammed, Ali J. and Ali, Hussein Hayder Mohammed and Barrak, Anwar S. and Hussein, A. M. and Mohammed, Murad Ramadan (2024) Enhancement of turbulent heat transfer by using CuO nano-particle and twisted tape. POLLACK PERIODICA : AN INTERNATIONAL JOURNAL FOR ENGINEERING AND INFORMATION SCIENCES, 19 (3). pp. 115-121. ISSN 1788-1994 (print); 1788-3911 (online)

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Abstract

A computational model is developed to investigate the convective heat transfer properties and the fluid flow characteristics of cupric oxide - water nano-fluid in a horizontal circular pipe aiming to provide insights into optimizing heat transfer in such systems. A twisted tape with varied twist ratios is inserted. This quantitative investigation used five Reynolds number from 4,000 to 12,000 under a uniform heat flux scenario of 25,000 W m−2. All experiments were performed as a single-phase fluid with cupric oxide values of 0, 0.4, 1, and 2% by volume. By reducing the twist ratio and increasing volume concentration, the average heat transfer coefficient of cupric oxide-water nano-fluid was improved. For a twist ratio of 4D, the maximum heat transfer improvement was 228% greater than the plain pipe. The presence of twisted tape with modest step ratios causes the friction factor to grow.

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