Enhancing PVT performance with triangular tubes: A numerical study on Bi-fluid cooling efficiency gainsEhab M. Almetwally, Abdelkrim Khelifa, Mohammed El Hadi Attia, Abd Elnaby Kabeel, Moataz M. Abdel‐AzizCase Studies in Thermal EngineeringVolume 74، Pages 1068312025Article Open access 9