The flow field around a micropillar confined in a microchannel

Jung, Jae-Seung; Kuo, Chih-Jung; Peles, Yoav; Amitay, Michael

doi:10.1016/j.ijheatfluidflow.2012.04.009

Cited by 28 publications

(14 citation statements)

References 28 publications

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“…Jung investigated the flow field of a microchannel with the micropillar pin fins by employing micro‐PIV technique . The different flow fields were elucidated.…”

Section: Discussionmentioning

confidence: 99%

“…Jung investigated the flow field of a microchannel with the micropillar pin fins by employing micro-PIV technique, and some flow parameters, for instant vorticity, TKE, etc, were expressed quantitatively as Re changed from 100 to 700. 23 Wang calculated the TKE to supply the survey of flow mixing through the utilization of micro-PIV. 24 And the TKE was proved to possess a close relationship with thermal performance, so TKE could be employed for predicting Nusselt number (Nu).…”

Section: Discussionmentioning

confidence: 99%

“…Jung investigated the flow field of a microchannel with the micropillar pin fins by employing micro-PIV technique. 23 The different flow fields were elucidated. The vorticity and TKE were presented at various flow regimes to provide measures to better understand the effect of the pin fins on the flow field.…”

Section: Discussionmentioning

confidence: 99%

“…In his experiments, the pin fins in the microchannel were arranged in‐line and staggered respectively in order to identify the impact on transient pressure drop, induced by the different arrangement methods. Jung investigated the flow field of a microchannel with the micropillar pin fins by employing micro‐PIV technique, and some flow parameters, for instant vorticity, TKE , etc, were expressed quantitatively as Re changed from 100 to 700 . Wang calculated the TKE to supply the survey of flow mixing through the utilization of micro‐PIV .…”

Section: Introductionmentioning

confidence: 99%

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Research on the mechanism of heat transfer enhancement in microchannel heat sinks with micropin fins

et al. 2020

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Summary In this paper, the pressure drop and heat transfer features of a microchannel applying micropin fins are investigated by numerical simulations and experiments. The microchannel, which is 20‐mm long, 2.7‐mm wide, and 0.3‐mm deep, is fabricated with copper and consisted of staggered diamond micropin fins. The visualization experiments, by means of the advanced technology micro‐particle image velocimetry (PIV), are conducted to discuss the mechanism of heat transfer by analysing the flow regimes. Meanwhile, 3D‐coupled numerical simulations are applied for the combination with experiments in this research. It is found that the vortex‐wake flow is stable at Reynolds number (Re) = 0 to 300, and a steady recirculating zone can be observed in the wake, where a pair of symmetrical vortices is formed. All the time, the vortex‐wake flow is unstable at Re = 300 to 650. Under this situation, it is due to the decrease of vorticity that the Nusselt number (Nu) is not significantly increased as it was expected. Thus, when Nu in the pin fin microchannel is predicted, the vorticity should be considered as well as turbulent kinetic energy (TKE). Furthermore, comparative study was carried out based on the mechanism proposed in this study among three kinds of microchannel with different fins, including staggered circular pin fins (CPF), square pin fins (SPF), and diamond pin fins (DPF).

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“…Jung investigated the flow field of a microchannel with the micropillar pin fins by employing micro‐PIV technique . The different flow fields were elucidated.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Research on the mechanism of heat transfer enhancement in microchannel heat sinks with micropin fins

et al. 2020

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“…demonstrated that the accuracy is 10 times higher than that of a conventional optical microscope, and the accuracy of the micro-PIV results has been validated. Jung et al [24] studied the flow field around a micropillar confined in a microchannel using micro-PIV …”

Section: Introductionmentioning

confidence: 99%

Micro-PIV visualization and numerical simulation of flow and heat transfer in three micro pin-fin heat sinks

Xia

Chen

Cheng

et al. 2017

International Journal of Thermal Sciences

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High-throughput microcapillary pump with efficient integrated low aspect ratio micropillars

Madadi

Casals‐Terré

Castilla-López

et al. 2013

Microfluid Nanofluid

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Prediction and reduction of pressure drop and resistance flow in micropillar arrays are important for the design of microfluidic circuits used in different lab-on-a-chip and biomedical applications. In this work, a diamond microchannel-integrated micropillar pump (dMIMP) with a resistance flow 35.5 % lower than a circular-based micropillar pump (cMIMP) has been developed via the optimization of the fluid dynamic behavior of different pillar shapes in a low aspect ratio (H/D ranged from 0.06 to 0.2) integrated pillar microchannel. The effect of different geometrical parameters (such as pillar shape and its distribution) has been considered to minimize the microchannel resistance flow. Six-micrometer-depth polidimetilsiloxane (PDMS) channels have been fabricated using a modified soft lithography process, which prevents the PDMS deformation under high-pressure operation. Flow through the fabricated samples has been numerically solved and experimentally measured, with an agreement higher than 90 %. The results have been used to validate the derived analytical formulation to determine the flow resistance in this type of channels, a fast approach to obtain the resistance flow in the design stage of microdevices. The analysis of the results indicates that, although porosity can be a determinant parameter to predict the resistance flow of MIMP, other geometrical parameters such as side distance between pillars and pillar shape play a major role in this scenario. Finally, a high-throughput optimized diamond MIMP pump has been designed, tested and validated as a capillary pump, showing that it can provide a flow rate 73 % higher than a circular MIMP pump.Peer ReviewedPostprint (published version

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The flow field around a micropillar confined in a microchannel

Cited by 28 publications

References 28 publications

Research on the mechanism of heat transfer enhancement in microchannel heat sinks with micropin fins

Research on the mechanism of heat transfer enhancement in microchannel heat sinks with micropin fins

Micro-PIV visualization and numerical simulation of flow and heat transfer in three micro pin-fin heat sinks

High-throughput microcapillary pump with efficient integrated low aspect ratio micropillars

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