This paper presents an experimental characterization of liquid nitrogen (LN2) thin-film evaporation on additively manufactured and Computer Numerical Control (CNC)-machined metal micropillar arrays. Five different additively manufactured and CNC-machined titanium (Ti-64) and stainless-steel (SS-304) micropillar surfaces with 1    cm 2 heating area were tested at a pressure of 1.38 MPa and a saturation temperature of 110 K. The micropillars had widths of 400 , 500 , and 600    μ m wall-to-wall spacing and 600    μ m height. An optimum micropillar spacing was observed where the heat flux was maximized to 90.1    W / cm 2 at approximately 500    μ m for the additively manufactured Ti-64 surface owing to the increased mean wicking velocity. A 44.5% decrease in dry-out heat flux was observed for the micropillar surface with the higher thermal conductivity material SS-304 compared to that with Ti-64, which can be attributed to the reduced bubble nucleation time and superheat. A 34% enhancement in dry-out heat flux was observed for the additively manufactured surface compared to the CNC-machined counterpart, which can be attributed to the augmented intrinsic surface roughness. A comparison of the experimental results with the literature model showed that the model overpredicts the dry-out heat flux limit of LN2 thin-film evaporation on both additively and conventionally manufactured metal surfaces.


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    Title :

    Liquid Nitrogen Thin-Film Evaporation on Metal Micropillar Arrays


    Contributors:


    Publication date :

    2025-01-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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