Visualization-assisted study of a new wickless pulsating vapor chamber

Abstract

With the improvement and miniaturization of electronic devices, the issue of heat dissipation is becoming increasingly prominent. In this paper, a novel wickless pulsating vapor chamber (VC) plate with Tesla valves is designed to address this problem. With the purpose to achieves continuous internal fluid circulation for heat transfer by harnessing the pulsating force generated from pressure differentials across various regions, in conjunction with the unidirectional nature of the Tesla valve structure.The working fluid used in this vapor chamber plate was perfluorohexanone. To assess the feasibility and temperature homogeneity of the design, a visualization-assisted study was conducted. The results showed that the working fluid within the vapor chamber formed a stable unidirectional circulation during heat dissipation. This circulation is crucial for effectively transferring heat away from the heat source. Furthermore, the study found that the overall average temperature difference across the vapor chamber was minimal. The average thermal resistance of the vapor chamber ranged from 0.076 to 0.105 W/K with a heat dissipation power ranging from 60 to 100 W (equivalent to a heating heat flux of 60–100 W/cm2). These research findings suggest that the new wickless pulsating vapor chamber (VC) plate, equipped with Tesla valves, is an efficient solution for heat dissipation. Its simplicity in manufacturing and low cost are crucial advantages, potentially broadening its applicability to various scenarios.