Flow and heat transfer characteristics in micro and mini communicating pressure driven channel flows by numerical simulations

Guzmán, Amador M.; Beiza, Maximiliano; Díaz, Andrés J.; Fischer, Paul; Ramos, Juan Carlos

doi:10.1016/j.ijheatmasstransfer.2012.11.021

Cited by 5 publications

(2 citation statements)

References 24 publications

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“…A series of communicating channel studies has also been performed for use in electronics cooling [8][9][10][11]. In these studies, straight channels were connected via branches oriented perpendicular to the flow direction.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Singh et al [3] investigated communicating wavy microchannels in a numerical study and found that the branches increased the heat transfer; the branches were angled at 45 deg from the flow direction, making them a more aerodynamic feature than the studies in Refs. [8][9][10][11]. Peng et al [12] mimicked the branching structures found in leaf veins, including the porous walls that make up those veins.…”

Section: Literature Reviewmentioning

confidence: 99%

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Numerical Optimization, Characterization, and Experimental Investigation of Additively Manufactured Communicating Microchannels

Kirsch

Thole

2018

Journal of Turbomachinery

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The degree of complexity in internal cooling designs is tied to the capabilities of the manufacturing process. Additive manufacturing (AM) grants designers increased freedom while offering adequate reproducibility of microsized, unconventional features that can be used to cool the skin of gas turbine components. One such desirable feature can be sourced from nature; a common characteristic of natural transport systems is a network of communicating channels. In an effort to create an engineered design that utilizes the benefits of those natural systems, the current study presents wavy microchannels that were connected using branches. Two different wavelength baseline configurations were designed; then each was numerically optimized using a commercial adjoint-based method. Three objective functions were posed to (1) minimize pressure loss, (2) maximize heat transfer, and (3) maximize the ratio of heat transfer to pressure loss. All baseline and optimized microchannels were manufactured using laser powder bed fusion (L-PBF) for experimental investigation; pressure loss and heat transfer data were collected over a range of Reynolds numbers. The AM process reproduced the desired optimized geometries faithfully. Surface roughness, however, strongly influenced the experimental results; successful replication of the intended flow and heat transfer performance was tied to the optimized design intent. Even still, certain test coupons yielded performances that correlated well with the simulation results.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Numerical Optimization, Characterization, and Experimental Investigation of Additively Manufactured Communicating Microchannels

Kirsch

Thole

2018

Journal of Turbomachinery

View full text Add to dashboard Cite

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Periodic Flows in Microfluidics

Mudugamuwa,

Roshan,

Hettiarachchi

et al. 2024

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Microfluidics, the science and technology of manipulating fluids in microscale channels, offers numerous advantages, such as low energy consumption, compact device size, precise control, fast reaction, and enhanced portability. These benefits have led to applications in biomedical assays, disease diagnostics, drug discovery, neuroscience, and so on. Fluid flow within microfluidic channels is typically in the laminar flow region, which is characterized by low Reynolds numbers but brings the challenge of efficient mixing of fluids. Periodic flows are time‐dependent fluid flows, featuring repetitive patterns that can significantly improve fluid mixing and extend the effective length of microchannels for submicron and nanoparticle manipulation. Besides, periodic flow is crucial in organ‐on‐a‐chip (OoC) for accurately modeling physiological processes, advancing disease understanding, drug development, and personalized medicine. Various techniques for generating periodic flows have been reported, including syringe pumps, peristalsis, and actuation based on electric, magnetic, acoustic, mechanical, pneumatic, and fluidic forces, yet comprehensive reviews on this topic remain limited. This paper aims to provide a comprehensive review of periodic flows in microfluidics, from fundamental mechanisms to generation techniques and applications. The challenges and future perspectives are also discussed to exploit the potential of periodic flows in microfluidics.

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