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• W4289275330 abstract "The focus of this paper is on visualizing the evaporation/boiling heat transfer characteristics of a 3D-printed stainless steel 316L wick. The experiments were carried out using a custom-built 3D-printed flat heat pipe (FHP) with a glass window, and visualization was done using a CCD camera with a microscopic lens to capture magnified pictures (see Fig. 1(a)). The combined visualization and thermal resistance measurement at various working fluid charges and heat loads provide insights into the evaporation process of 3D printed wick structures. Fig. 1(b) shows a typical evaporation thermal resistance variation as a function of heat flux and filling ratio. As evidenced, thermal resistances decrease sharply as the heat transfer rate increases in all cases, as reported in our previous study [1]. The main goal of this study is to visualize the flow and phase transition characteristics of the working fluid in the tested FHP to guide mechanism analysis. The change of the vapor-liquid interface of the wick at the evaporation end is shown in Fig. 1(c-e) for different filling ratios of 50%, 80%, and 100% and a heat flux of 7.5 kW/m2. The amount of liquid that completely fills the wick is referred to as the liquid filling rate at 100%. When the filling rate was less than 100%, there was no nucleate boiling phenomenon. As heating power increases, the vaporliquid interface decreases and the dry area at the top of the mesh wick increases until the wick is completely dry for the lowest filling ratio. Fig. 1(f-h) shows the change of the vapor-liquid interface at the evaporation end under different heating power and the filling ratio of 130%. Bubbles are formed as the heating process begins, and as the heating process progresses, the bubbles merge and grow in size. It should be noted that nucleate boiling does not prevent system operation. Even with vapor bubbles present in the evaporator, the liquid continues to flow via capillary means from the condenser to the evaporator. The experimental results show that 3D printing is a promising technology for fabricating freeform porous structures for heat pipe applications and the data presented in this paper can help engineers and researchers develop new 3D-printed wick structures." @default.
• W4289275330 created "2022-08-01" @default.
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• W4289275330 date "2022-01-01" @default.
• W4289275330 modified "2023-09-26" @default.
• W4289275330 title "VISUALIZING THE EVAPORATION/BOILING HEAT TRANSFER OF A 3D-PRINTED WICK FOR HEAT PIPE APPLICATIONS" @default.
• W4289275330 cites W2996982418 @default.
• W4289275330 doi "https://doi.org/10.1615/ichmt.2022.conv22.370" @default.
• W4289275330 hasPublicationYear "2022" @default.
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