| dc.description.abstract | The Closed Loop Pulsating Heat Pipe (CLPHP), a device pivotal in thermal management
systems, is scrutinized for its performance across varying filling ratios (50% and 60%) and with
different working fluids: ethanol, methanol, ethylene glycol, and Acetone. Ethanol emerges as a
superior working fluid, demonstrating robust heat transfer capabilities at both filling ratios, with
optimal performance at 60% due to favorable phase change and pulsation dynamics. Methanol,
while showing enhanced heat dissipation at a 60% ratio, runs the risk of premature dry-out,
where the liquid phase fails to return to the evaporator a critical system limitation. Ethylene
glycol's higher viscosity favors a 50% filling ratio, avoiding the suboptimal heat transfer that
higher ratios incur. With its low boiling point and high thermal conductivity, Acetone excels
particularly at 60%, maintaining lower thermal resistance without the dry-out issues prominent at
lower fillings. In board-level applications, where spatial, gravitational, and integration
considerations are paramount, the design of the CLPHP must adeptly navigate these constraints.
Failures such as dry-out or thermal saturation, exacerbated by excessive heat input and poor fluid
dynamics, highlight the need for a careful balance between thermal input and fluid properties.
The study recommends advanced wick structures and precise fluid management in future CLPHP
designs to enhance capillary action and efficiency. This comprehensive understanding is vital for
optimizing CLPHP deployment in high-heat-flux applications, both existing and emergent,
ensuring reliability and performance in demanding thermal environments | en_US |
