Akademik Veri Yönetim Sistemi
Joint 22nd International Heat Pipe Conference and 16th International Heat Pipe Symposium, Bangkok, Tayland, 24 - 28 Kasım 2024, ss.420-425, (Tam Metin Bildiri)
n response to the rising popularity of foldable electronics, Flexible Pulsating Heat Pipes (FPHPs) have emerged as a potential, adaptable and efficient solution for smart thermal management. This study experimentally investigates the performance of a novel FPHP with asymmetric channels at various bending angles. Four bending angles (0⁰, 30⁰, 60⁰, and 90⁰) were tested to observe the effect on the thermal resistance, evaporator temperature, pressure, and the underpinned two-phase flow dynamics. All experiments were conducted under constant filling ratio of 50% and heating power range of 4-32W using a compatible working fluid (FC-72). The tested FPHP was fabricated utilizing the stereolithography (SLA) technique. Results indicated that the required start-up temperature at the evaporator increases when the position of the condenser section is changed from vertical to 90 bending. Additionally, as the heating power increases, the thermal resistance variations are similar for 0, 30, and 60 bending angles, whereas the thermal performance deteriorates at 90. The excessive bend at 90 results in a significantly increased flow resistance, affecting the internal flow. This results in a sudden increase of the evaporator temperature and pressure, leading to dry-outs. The maximum operating heating power is 32W for 0⁰, 30⁰, and 60⁰, while it reduces to 20W for 90⁰.