Capillary flow through rectangular micropillar arrays

Hale, Renee; Ranjan, Ram; Hidrovo, Carlos

doi:10.1016/j.ijheatmasstransfer.2014.04.016

Cited by 31 publications

(17 citation statements)

References 25 publications

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“…Micro-pins in a rectangular arrangement are also more permeable compared to other pin arrangements and sintered-powder wicks, shown in Figure 11. This is due to the presence of larger flow channels in a rectangular pin arrangement, which results in larger permeability to liquid flow, and with the combination of small pin-to-pin spacing, a higher overall capillary performance is achievedthis also reinforces the findings of Hale et al (2014a) and Hale et al (2014b).…”

Section: Capillary Performance Comparisonsupporting

confidence: 69%

“…Cho et al (2018) found that, among silica-plated copper micro-pin structures with 45-80% porosity, rectangular arrangement provided the highest permeability, capillary performance and directionality in fluid flow (highest permeability along widest tracks). Other works have confirmed these findings (Hale et al, 2014a;Hale et al, 2014b), showing that rectangular arrangement provide higher capillary performance than the square arrangement due to a higher permeability with similar capillary pressure. However, rectangular pins show significant anisotropy in fluid flow; in comparison, hexagonal arrangement performed most similarly to sintered wicks in isotropy of capillary flow.…”

Section: Manufacturing Process Of Porous Wicks Via Laser Powder Bed Fusionmentioning

confidence: 56%

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Laser powder bed fusion additive manufacturing of copper wicking structures: fabrication and capillary characterization

Mezghani

Nassar

Dickman

et al. 2021

RPJ

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Purpose An integral component in heat pipes (HPs) and vapor chambers (VCs) is a porous wicking structure. Traditional methods for manufacturing wicking structures within HPs and VCs involve secondary manufacturing processes and are generally limited to simple geometries. This work aims to leverage the unprecedented level of design freedom of laser powder bed fusion (LPBF) additive manufacturing (AM) to produce integrated wicking structures for HPs and VCs. Design/methodology/approach Copper wicking structures are fabricated through LPBF via partial sintering and via the formation of square, hexagonal and rectangular arrangements of micro-pins and micro-grooves, produced in multiple build directions. Wicks are characterized by conducting capillary performance analysis through the measurement of porosity, permeability and capillary rate-of-rise. Findings Copper wicking structures were successfully fabricated with capillary performance, K/reff, ranging from 0.186–1.74 µm. The rectangular-arrangement micro-pin wick presented the highest performance. Originality/value This work represents the first published report on LPBF AM of copper wicking structures for HPs/VCs applications and represents foundational knowledge for fabricating complete assemblies of copper VCs and HPs through LPBF AM.

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Section: Capillary Performance Comparisonsupporting

confidence: 69%

Section: Manufacturing Process Of Porous Wicks Via Laser Powder Bed Fusionmentioning

confidence: 56%

Laser powder bed fusion additive manufacturing of copper wicking structures: fabrication and capillary characterization

Mezghani

Nassar

Dickman

et al. 2021

RPJ

View full text Add to dashboard Cite

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“…The complex flow phenomena in propped fractures and their effective transport properties have been extensively investigated using lab experiments [4,5], field observations [6], and numerical simulations [4]. Flow through apertures with cylindrical obstacles is also relevant to engineering applications such as micropillar arrays of cylinders used in Lab-on-a-chip systems for high performance liquid chromatography [7].…”

Section: Introductionmentioning

confidence: 99%

“…Single and multiphase flow properties of realistic rock geometries were studied in another work of Boek and Venturoli [32]. Works by Hale et al [7] and other by Hong et al [70] are dedicated to multiphase flow in Hele-Shaw cell, mainly capillary action for thin domain with boundaries. The depth-averaged Stokes-Brinkman equation was used by Horgue et al [71] and compared with experimental results for two-phase flows in the domain with cylindrical obstacles.…”

Section: Introductionmentioning

confidence: 99%

Depth-averaged Lattice Boltzmann and Finite Element methods for single-phase flows in fractures with obstacles

Dzikowski

Jasinski

Dąbrowski

2018

Computers & Mathematics with Applications

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We use Lattice Boltzman Method (LBM) MRT and Cumulant schemes to study the performance and accuracy of single-phase flow modeling for propped fractures. The simulations are run using both the two-and three-dimensional Stokes equations, and a 2.5D Stokes-Brinkman approximate model. The LBM results are validated against Finite Element Method (FEM) simulations and an analytical solution to the Stokes-Brinkman flow around an isolated circular obstacle. Both LBM and FEM 2.5D Stokes-Brinkman models are able to reproduce the analytical solution for an isolated circular obstacle. In the case of 2D Stokes and 2.5D Stokes-Brinkman models, the differences between the extrapolated fracture permeabilities obtained with LBM and FEM simulations for fractures with multiple obstacles are below 1%. The differences between the fracture permeabilities computed using 3D Stokes LBM and FEM simulations are below 8%. The differences between the 3D Stokes and 2.5 Stokes-Brinkman results are less than 7% for FEM study, and 8% for the LBM case. The velocity perturbations that are introduced around the obstacles are not fully captured by the parabolic velocity profile inherent to the 2.5D Stokes-Brinkman model.

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“…Flow across arrays of pillars embedded inside microfluidic chip systems is one of the most active research fields and is of great importance for high-performance liquid chromatography [1] , thermal management [2] , dielectrophoresis [3] , and isolating diseased cells [4] . These micropillars can increase mass and heat transfer coefficients, surface-to-volume ratio, surface chemical reactions, and heat conductivity with the compromise of a decrease in the effective cross section area [5] .…”

Section: Introductionmentioning

confidence: 99%

Dissipative particle dynamics simulation of flow through periodic arrays of circular micropillar

Zhang¹,

Zhou

Liu

et al. 2016

Appl. Math. Mech.-Engl. Ed.

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Flow through arrays of micropillar embedded inside microfluidic chip systems is important for various microfluidic devices. It is critical to accurately predict the mass flow rate through pillar arrays based on the pillar design. This work presents a dissipative particle dynamics (DPD) model to simulate a problem of flow across periodic arrays of circular micropillar and investigates the permeability of two types of micropillar arrays. The flow fields including horizontal and vertical velocity fields, the number density field, and the streamline of the flow are analyzed. The predicted solid volumes by the presented DPD simulation of both types of arrays are quite close to the actual counterparts. These quantitative agreements show usefulness and effectiveness of the DPD model in simulating arrays of micropillar. By comparing two types of micropillar arrangement patterns, we find that the arrangement pattern of micropillar does not have significant influence on the permeability of the array.

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Capillary flow through rectangular micropillar arrays

Cited by 31 publications

References 25 publications

Laser powder bed fusion additive manufacturing of copper wicking structures: fabrication and capillary characterization

Laser powder bed fusion additive manufacturing of copper wicking structures: fabrication and capillary characterization

Depth-averaged Lattice Boltzmann and Finite Element methods for single-phase flows in fractures with obstacles

Dissipative particle dynamics simulation of flow through periodic arrays of circular micropillar

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