Study of Heat and Mass Transfer by Bionic Fractal Microchannel Plates

Niu, Yating; Huang, Pingnan; Pan, Mei

doi:10.1002/ceat.202000554

Cited by 9 publications

(2 citation statements)

References 18 publications

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“…17 The water transport of plants from root to stem or stem to branch belongs to a bifurcated divergent structure. 18 In addition, the same bifurcated structure is found in animal bones, river courses, and ocean currents. The bifurcated structure makes the water pressure difference between the multiple layers more efficient, that is, the transfer path of the first branch to the second or multiple branches makes the water transport and circulation more efficient.…”

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confidence: 81%

Structural design of single functional jersey with moisture comfort based on yarn combination

Cong

Liu

et al. 2023

Textile Research Journal

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Yarn property and structure design play a decisive role in the sweat, evaporation and heat dissipation comfort of single jersey. However, single jerseys also tend to exhibit limited moisture comfort properties, even with the use of high-performance fibers or specific structures. They also have some common phenomena such as backflow and the poor isolation of sweat, making the garment feel uncomfortable when worn. To enhance the moisture comfortable feeling of single jersey, the fabric is formed from a yarn combination of 75 dtex/288 f and 50 dtex/14 f polyesters, and the fabric structure with rapid moisture conduction is formed through the structural design. Through the research method of this paper, the single jersey ensures an excellent capillarity effect, and the outer surface of the fabric shows a large loop structure. In contrast, the inner surface is supported by yarn without contact with the skin. Furthermore, the fabric contains three pathways to transfer sweat outward, including a multistage bifurcated transmission system, which aids in the improvement of fabric moisture conduction, penetration and prevention. In the various tests, compared with plain structure, the single jersey of this design scheme exhibits a 1.98-fold larger loop size. It contains an effective sweat transmission pathway, which improves fabric air permeability and water permeability. In addition, the water repellent effect of the fabric is improved by 26.56%, with the inner surface of the fabric remaining dry within 3 s, even in the presence of heavy sweating. It is expected that the structural and material optimization designs of the single jersey can provide a promising method for functional textiles.

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confidence: 81%

Structural design of single functional jersey with moisture comfort based on yarn combination

Cong

Liu

et al. 2023

Textile Research Journal

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“…Microfluidic technology boasts high specific surface area (W. Li et al, 2012), precise control (Jahnisch et al, 2004), and inherent safety (Yoshida et al, 2011) advantages. The highly monodisperse droplets and bubbles produced can be utilized to enhance mass transfer performance (Niu et al, 2021) and increase reaction rates (Song et al, 2021). Droplets aggregate to form droplet swarms (Kim et al, 2014), and the droplet swarms with highly ordered and homogeneous crystallinelike structures are considered to be soft flowing crystals Raven and Marmottant, 2009).…”

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confidence: 99%

Arrangement and feedback effects of droplet swarms in a parallel microchannel device

Li,

He,

Wang

et al. 2024

Preprint

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Droplet swarms are the dominant form of highly dispersed microdroplets in cavities. In the self-assembly of droplet swarms, the continuous phase tends to flow in the path of the minimum resistance, the arrangement of the droplet swarms tends to minimize the potential energy, and the two mechanisms compromise in competition. In this paper, whether droplet swarms can timely adjust the morphology is measured by the ratio of the average flow rate of the two-phase flow to that of the droplet swarms, so as to clarify the dominant mechanism of the arrangement of droplet swarms. The arrangement of droplet swarms dominated by different mechanisms and the distribution of that are introduced, and the prediction method for the arrangement of droplet swarms is proposed. The mechanism of the breakup of the microdroplet in the cavity is elucidated, and three modes of the breakup in the cavity are introduced. Furthermore, a resistance model for the microdevice is established to quantify the fluctuations of the pressure difference and the flow rate caused by the formation of droplet swarms. The influence of the feedback effects of droplet swarms on the uniformity of droplet formation and flow patterns is analyzed, indicating the ideal flow range for the formation of highly dispersed droplets in microchannels. This paper clarifies the arrangement and feedback effects of droplet swarms, which will guide the application of microdevices in reaction and mass transfer processes.

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Topology optimization of a novel bionic fractal microchannel applied in thermal management of electronic components

Wang

Sun

et al. 2023

Asia-Pacific J Chem Eng

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Reducing energy consumption and improving device efficiency are important ways to realize efficient heat dissipation of microdevices, this paper developed a new bionic fractal microchannel heat sink based on fractal theory and topological optimization ideas, which introduced a binary flow stagnation zone optimization based on topological optimization ideas on the basic fractal microchannel. The thermal and hydraulic properties of a nanofluid in a fractal microchannel heat sink (FMCHS) have been numerically simulated with the fractal dimensions (fd = 1, 1.5, and 2) and Reynolds number (Re = 200–1600) as variables, and the comprehensive performance has been analyzed. The results showed that the introduction of the optimization increases the central velocity of the microchannel by 7.14–18.2%. With fractal dimensions of 1.5 and 2, the flow improvement and velocity increase are significant, and a significant Nusselt number improvement is obtained. The best comprehensive performance is obtained for FMCHS with a fractal dimension of 1.5, with an optimization effect of 8.3%.

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Study of Heat and Mass Transfer by Bionic Fractal Microchannel Plates

Cited by 9 publications

References 18 publications

Structural design of single functional jersey with moisture comfort based on yarn combination

Structural design of single functional jersey with moisture comfort based on yarn combination

Arrangement and feedback effects of droplet swarms in a parallel microchannel device

Topology optimization of a novel bionic fractal microchannel applied in thermal management of electronic components

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