@inproceedings{d93d1239c62742c6bc88a1ce4301c5bf,
title = "Heat Transfer Enhancement in A Minichannel Due to Asymmetric Sinusoidal Pulsating Flows",
abstract = "The development of current and next generation high performance electronic devices has led to smaller components in more densely packed spaces. The increasing power levels has resulted in ever-increasing heat flux densities which necessitates the evolution of new liquid-based heat exchange technologies. Pulsating flow in single-phase cooling systems is viewed as a potential solution to the problems involving high heat flux densities. This work involves an experimental analysis using infrared thermography (IR) of hydrodynamically and thermally developed pulsating flows in a rectangular minichannel undergoing asymmetric sinusoidal flow pulsation formats. The minichannel design includes a heated bottom section approximated as a constant heat flux boundary by uniformly heating a 12.5 μm thick Inconel foil, resulting in volumetric heat generation rates of up to 360 MW/m3. Asymmetric sinusoidal pulsating flows in the form of leading and lagging profiles with Womersley number of 2.59 and a fixed flow rate amplitude ratio 3 are investigated. The pulsating wall temperature profiles are recorded non-intrusively using a FLIR SC6000 high-speed, high resolution, infra-red camera. The rapid fluctuating characteristics of asymmetric waveforms causes a sudden shift in the flow velocity profiles and the subsequent increased pressure drop shows an evolution of phase lag. The intensification of fluid momentum due to high oscillating flowrate amplitudes causes enhanced mixing in the near-wall and bulk regions of the channel, shown by the wall temperature profiles for lagging and leading cases respectively. Although the presence of wall viscous forces leads to the phenomenon of annular effects which has been widely investigated in the literature for symmetric flow profiles. The wall and bulk temperature profiles tend to readily adjust to this rapidly fluctuating flow. The effect of high pulsation flow rate amplitude leads to a substantial heat transfer enhancement of about 28% over the steady flows.",
keywords = "electronics cooling, flow pulsation, flowrate modulation, heat transfer, minichannel",
author = "Kumavat, {Parth S.} and Sajad Alimohammadi and O'Shaughnessy, {Seamus M.}",
note = "Publisher Copyright: {\textcopyright} 2022 IEEE.; 28th International Workshop on Thermal Investigations of ICs and Systems, THERMINIC 2022 ; Conference date: 28-09-2022 Through 30-09-2022",
year = "2022",
month = sep,
day = "28",
doi = "10.1109/THERMINIC57263.2022.9950645",
language = "English",
series = "THERMINIC 2022 - 28th International Workshop on Thermal Investigations of ICs and Systems, Proceedings",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
booktitle = "THERMINIC 2022 - 28th International Workshop on Thermal Investigations of ICs and Systems, Proceedings",
address = "United States",
}