Comparative Study of Rectangular and Trapezoidal Microchannels Using Water and Liquid Metal

The present study aims to investigate the effect of the round edge on the laminar Newtonian fluid that flows through a channel. As an innovation, the sine and cosine transform functions are employed to solve the momentum governing equation in Cartesian and Cylindrical coordinates. Owing to the duct symmetric, only the quarter of the cross-section (θ = 0 to π/2) is analyzed. The analytical correlations for velocity distribution in both coordinates are provided; afterward, the effect of the round edge on the velocity profile has been investigated. It can be concluded that if a circular cross-section is replaced with a non-circular cross-section, the velocity profile becomes more uniform and less velocity variation is observed. Further, with a constant pressure gradient, among rectangular, round edge and circular cross-sections, the maximum velocity in a circular cross-section becomes minimum. In addition, it is observed that for the same pressure difference, an increase of m value leads to the higher average velocity and mass flow.

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“…To obtain the dimensionless velocity distribution in cylindrical coordinate, Eq. (14) and (15) are solved, and we have:…”

Section: Applying Cosine Transformmentioning

confidence: 99%

“…The efficiency dependency of the coolant on the channel's cross-section in microchannels is provided by Sharma et al [15]. They analyzed the performance of trapezoidal (with two configurations A and V-type) and rectangular microchannels.…”

Section: Introductionmentioning

confidence: 99%

Impact of round edge on the duct fluid flow: analytical investigation

et al. 2021

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“…Ga and its alloys have been proposed as replacements for Hg in dental filling materials [ 18 , 19 , 20 ] and high-temperature thermometers [ 21 , 22 , 23 , 24 ]. Ga and Ga-based alloys have also been studied as potential coolants in nuclear power plants as an alternative to Na [ 10 , 25 , 26 , 27 , 28 , 29 ], and in microelectronic devices, such as computers and smart phones [ 30 , 31 , 32 , 33 , 34 , 35 ]. Eutectic Ga-In (EGaIn) alloys and Ga-In-Sn alloys (such as Galinstan) have received the most attention in the literature in terms of microelectronic applications.…”

Section: Properties Of Ga and Ga-based Alloysmentioning

confidence: 99%

Ga-Based Alloys in Microelectronic Interconnects: A Review

et al. 2018

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Gallium (Ga) and some of its alloys have a range of properties that make them an attractive option for microelectronic interconnects, including low melting point, non-toxicity, and the ability to wet without fluxing most materials—including oxides—found in microelectronics. Some of these properties result from their ability to form stable high melting temperature solid solutions and intermetallic compounds with other metals, such as copper, nickel, and aluminium. Ga and Ga-based alloys have already received significant attention in the scientific literature given their potential for use in the liquid state. Their potential for enabling the miniaturisation and deformability of microelectronic devices has also been demonstrated. The low process temperatures, made possible by their low melting points, produce significant energy savings. However, there are still some issues that need to be addressed before their potential can be fully realised. Characterising Ga and Ga-based alloys, and their reactions with materials commonly used in the microelectronic industry, are thus a priority for the electronics industry. This review provides a summary of research related to the applications and characterisation of Ga-based alloys. If the potential of Ga-based alloys for low temperature bonding in microelectronics manufacturing is to be realised, more work needs to be done on their interactions with the wide range of substrate materials now being used in electronic circuitry.

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“…AJM is a non-conventional machining technique with applications in micro-technology, in particular in the fabrication of microfluidic lab-on-a-chip devices [54]. It uses compressed air to accelerate micro-scale particles through a nozzle and onto a target material, where the material is removed through solid particle erosion mechanisms.…”

Section: Introductionmentioning

confidence: 99%

A Newtonian approach to predict the parameters required to machine high aspect ratio channels of prescribed topography

Ghazavi¹

2021

Preprint

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Control of the microchannels’ cross-sectional shape may be of interest in micro-heat sinks, microfluidic particle sorting, and micro-machine lubrication applications. Previously, inverse methods have been used to determine the abrasive jet micromachining (AJM) traverse speed and path required to sculpt the desired cross-section for low Aspect Ratio (AR, the ratio of depth to width, see page xiv) topographies (<0.06). This thesisintroduces an iterative inverse method which allows prediction of the machining procedure required to sculpt high AR (>0.06-1) microchannels of prescribed cross-sectional shape using mask-less AJM. The predictions were experimentally verified for trapezoidal and semi-circular micro-channels and protruded features in borosilicate glass, and symmetric and non-symmetric wedges in poly-methyl-methacrylate (PMMA). Overall, the average accuracy of the machined profiles was 93.6 % in borosilicate glass and 91 % in PMMA. The methodology opens up new possibilities for the micro-fabrication of high-aspect-ratio micro-features of virtually any desired shape.

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Comparative Study of Rectangular and Trapezoidal Microchannels Using Water and Liquid Metal

Cited by 11 publications

References 8 publications

Impact of round edge on the duct fluid flow: analytical investigation

Impact of round edge on the duct fluid flow: analytical investigation

Ga-Based Alloys in Microelectronic Interconnects: A Review

A Newtonian approach to predict the parameters required to machine high aspect ratio channels of prescribed topography

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