Heat Transport Device Based on Pulsating Thermosyphons with Forced Fluctuations of Pressure

The use of heat transfer devices as Pulsating Two-Phase Thermosyphons (PTPTs) could be competitive with more investigated heat transfer devices as LHP or CPL, above all in electronic equipment cooling. These devices in fact are able to overcome high pressure drop of the loop without the use of external work or any high costs technologies elements like as the capillary structure. A forced pressure oscillation PTPT has been realized in the laboratory of Pisa University and its thermal behaviour at different evaporator input power (100-1200 W) is investigated. In order to provide some guidelines to design this kind of apparatus for thermal control of electronic equipment, a mathematical model based on the lumped capacitance method and the solution of unsteady differential equation with the Euler Method is presented and validated with experimental data obtained with a dielectric fluid (HCFC 141b). The mathematical model gets the ideas by the direct observation of the thermal behaviour of the apparatus, and it is able to predict the experimental data with a good qualitative accordance and errors lower than 15% on the main parameters of the transport cycle