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Heat Transfer Enhancements through Multiharmonic Surfaces of Internal Flow in Micro-wavy Channels

Graduate #111
Discipline: Technology and Engineering
Subcategory: Civil/Mechanical/Manufacturing Engineering

Justin Moon - California State University, Los Angeles
Co-Author(s): ARTURO PACHECO-VEGA, California State University - Los Angeles, Los Angeles, California; J. RAFAEL PACHECO-Vega, SAP Americas, Tempe, Arizona



In this study, numerical simulations are performed to investigate the heat transfer in three-dimensional multi-harmonic microscale wavy channels. The focuses are on the analysis of the channel surface-topography, modeled as a sinusoidal wave of square cross-sectional area, through which the cold water within the laminar regime flows, and on its influence on the enhancing mechanisms. A device of length of 20 mm, 16 mm of which are of sinusoidal shape, with 2 mm straight sections at the channel inlet
and outlet, is used as baseline for comparison purposes. The channel is enclosed
by a solid rectangular prism block, on which heat flux of 47 W/cm2 acts at the
bottom surface within the sinusoidal region. Using the performance factor (P F);
i.e., the ratio of the Nusselt number to the pressure drop, as objective function, a
parametric analysis is carried out for a set of inlet velocities (Re=50, 100 and 150),
to investigate whether (and how) the addition of harmonic-waves for the channel
geometry enhances the value of the PF in comparison to that of a single-wave device.

Moon_Justin_Abstract_Ern.docx

Funder Acknowledgement(s): This work has been supported by NSF HRD-1547723

Faculty Advisor: Dr. Arturo Pacheco-Vega, apacheco@calstatela.edu

Role: My contribution includes the mathematical modeling of the system. I conducted the computer simulations, and analyzed the numerical simulations. More data regarding the effects due to the harmonics were my supplemental efforts.

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This material is based upon work supported by the National Science Foundation (NSF) under Grant No. DUE-1930047. Any opinions, findings, interpretations, conclusions or recommendations expressed in this material are those of its authors and do not represent the views of the AAAS Board of Directors, the Council of AAAS, AAAS’ membership or the National Science Foundation.

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