Author(s): Hussein Hayder Mohammed Ali

Abstract: Heat exchangers are mechanical devices that enable the transfer of thermal energy between two fluids that possess dissimilar temperatures while simultaneously preventing any intermingling between the fluids. Researchers in this study test how well a double-tube heat exchanger works by using both straight and convoluted tubes and a nanofluid that has CuO nanoparticles in it along with water. The inner tube under consideration is a continuous and convoluted object with a length of 1000 millimeters. It exhibits a smooth surface while also possessing a convoluted configuration. This convoluting is characterized by a total of 59 rotations, with each rotation having a height of 5 millimeters and being separated from the adjacent rotation by a distance of 0.8 millimeters. The physical model of the test part of the double tube heat exchanger utilizes two horizontal concentric cylinders to provide a concentric annular gap. The working fluid utilized in the cold and hot field reverse flow is a combination of water and nanofluid. The concept of the double tube heat exchanger's 3D model is designed, followed by a simulation using ANSYS FLUENT 2023 R1. Subsequently, the mesh is created. This study necessitates a total of 350 iterations. The findings are displayed for a variety of Reynolds numbers spanning from 6000 to 11000, specifically focusing on the convoluted tube's burr number of 95. The parameters examined and compared include pressure drop, friction coefficient, cold exit temperature, and average Nusselt number.

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