Abstract

VALENCIA-CASTILLO, César Manuel et al. Simulation of a micro-evaporator for a single horizontal 1-mm circular micro-tube. Rev. cienc. tecnol. [online]. 2023, vol.6, n.2, e250.  Epub Aug 14, 2023. ISSN 2594-1925.  https://doi.org/10.37636/recit.v6n2e250.

Flow boiling into micro-channels is a good option of cooling solutions for electronic devices. Numerical simulations allow designing correctly before manufacturing. In this paper, the results of a steady-state one-dimensional simulation are presented for a single horizontal circular 1-mm tube. Through the refrigerant flows, two regions are distinguished: subcooled liquid flow and two-phase flow. Typical equations and correlations have been used for subcooled liquid flow; while one theoretical model has been used for two-phase flow. The results presented here are those by using perfluorohexane, which is used in the formulation of FC-72, a refrigerant for cooling electronic devices. For the range of tested parameters, the next conclusions come: i) from the point of view of choosing the pump, the highest subcooled level, and inlet pressure should be preferred; ii) in order to avoid the critical heat flux condition, the lowest inlet pressure should be preferred; iii) there is a contradiction for choosing the right inlet pressure because is opposite for the point of view of pump selection and critical heat flux condition.

Keywords : Micro-evaporator; Flow boiling; Numerical simulation; Subcooled liquid flow; Two-phase flow.

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