Abstract
The effect of solid particles on the performance of pulsating heat pipe (PHP) has been investigated using unlooped and looped PHPs. The PHP is made of copper tubes with 3mm OD and 2mm ID, and the number of turns is 12. Lengths of heating, adiabatic and cooling sections are 50mm, 100mm (or 90mm) and 50mm, respectively. Diamond particle (8-20μm) or alumina particle (10μm) is added to the working fluid, water or R141b. It was found, the temperature difference between heating and cooling sections decreases by adding particles. The enhancement of PHP performance by particle is more remarkable for looped PHP. Alumina particle has nearly the same effect as diamond particle in high heat input region.
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