Published Paper Details:

A Double Helical Coil Heat Exchanger (DHCHE) using nanofluids is an advanced thermal system designed to enhance heat transfer performance by combining the benefits of helical geometry and high-conductivity working fluids. The helical coil structure induces secondary flow patterns, known as Dean vortices, which improve fluid mixing and significantly increase the heat transfer rate compared to conventional straight tube heat exchangers. In this study, nanofluids such as Al?O? dispersed in base fluids like water are utilized to further enhance thermal conductivity. The presence of nanoparticles increases the heat transfer coefficient, leading to improved thermal efficiency of the heat exchanger. Key performance parameters, including temperature distribution, pressure drop, Nusselt number, and overall heat transfer coefficient, are analyzed to evaluate system effectiveness. The results demonstrate that the use of nanofluids in a helical coil heat exchanger considerably improves heat transfer performance while maintaining a compact design. Although an increase in pressure drop is observed due to both the helical curvature and nanoparticle addition, the overall thermal enhancement outweighs this drawback. This makes nanofluid-based double helical coil heat exchangers highly suitable for applications in power plants, chemical industries, refrigeration systems, and energy-efficient heat recovery processes [1] .