Modassir Ahmad and Piyush Kumar Verma 2026. CFD Analysis of the Effects of Fin Geometry and Fluid Velocity on the Performance of a Double-Pipe Heat Exchanger. International Journal of Innovations in Science Engineering And Management. 5, 4 (Oct. 2026), 168–185. DOI:https://doi.org/10.69968/ijisem.2026v5i4168-185.