A combined experimental and numerical approach for heat transfer enhancement in a minichannel using half rectified pulsating flows
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2024Author:
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Kumavat, P.S., Alimohammadi, S., O'Shaughnessy, S.M., A combined experimental and numerical approach for heat transfer enhancement in a minichannel using half rectified pulsating flows, Journal of Physics: Conference Series, 2766, 1, 2024Download Item:
Abstract:
The miniaturization of electronic packages and their associated high-power density
circuits requires more innovative cooling solutions. Single phase pulsating flows offer a
promising solution due to their disruption of the thermal boundary layer. This study aims to
bridge the knowledge gap by using experimental and computational methods to investigate the
complex flow characteristics of laminar pulsating flows in a heated rectangular minichannel and
couple that analysis with an investigation of thermal-hydraulic performance. Experimental
analysis involves a uniformly heated thin foil approximating a constant heat flux bottom wall.
Wall temperature measurements are recorded using an infrared thermography system.
Analogous to the experimental conditions, a three-dimensional conjugate heat transfer
computational model is developed with a volumetric heat generation source. Positive and
negative half rectified sinusoidal pulsating flow waveforms are studied for dimensionless
pulsation frequencies or Womersley numbers of 𝑊𝑜 = 2.5 and 5.1 at a fixed flow rate amplitude
𝐴0 = 3. For the positive half rectified waveform, a marginal enhancement in heat transfer of
2.2% for 𝑊𝑜 = 2.5, 𝐴0 = 3 was obtained. Whereas the negative half rectified case leads to a
heat transfer enhancement of 9% and 6% for 𝑊𝑜 = 2.5 and 𝑊𝑜 = 5.1 respectively, with a high
thermal performance of 𝜂 = 2.4 over corresponding steady flow.
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http://people.tcd.ie/oshaugseDescription:
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Author: O'Shaughnessy, Seamus
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Journal ArticleSeries/Report no:
Journal of Physics: Conference Series2766
1
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http://dx.doi.org/10.1088/1742-6596/2766/1/012180Metadata
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