Micro-PIV and numerical study on influence of vortex on flow and heat transfer performance in micro arrays

Qin, Luwen; Hua, Jian; Zhao, Xiangen; Zhu, Yong‐Guan; Li, Dong; Liu, Zhigang

doi:10.1016/j.applthermaleng.2019.114186

Cited by 15 publications

(2 citation statements)

References 29 publications

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“…The technology for fabricating micro-scale engineering components and features is of interest to the biomedical, optical, and electronical industries [1]. One of the essential components is an arrayed protrusion (or micro pin-fins) of complex cross-sectional profiles (i.e., elliptical, circular, and diamond shapes), which is used for high heat dissipation from high-performance microelectronics [2]. The fabrication of such protrusions requires dedicated technology to achieve high dimensional accuracy and cost-effectiveness in the products.…”

Section: Introductionmentioning

confidence: 99%

Laser Micromachining in Fabrication of Reverse-µEDM Tools for Producing Arrayed Protrusions

2022

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This paper focuses on the fabrication of high-quality novel products using a µEDM process variant called Reverse-µEDM. The tool plate required for the Reverse-µEDM is fabricated using Nd: YAG-based laser beam micromachining (LBµM) at the optimized process parameters. The Grey relation analysis technique is used for optimizing LBµM parameters for producing tool plates with arrayed micro-holes in elliptical and droplet profiles. Titanium sheets of 0.5 mm thickness were used for such micro-holes, which can be used as a Reverse-µEDM tool. The duty cycle (a combination of pulse width and frequency) and current percentage are considered as significant input process parameters for the LBµM affecting the quality of the micro-holes. A duty cycle of 1.25% and a current of 20% were found to be an optimal setting for the fabrication of burr-free shallow striation micro-holes with a minimal dimensional error. Thereafter, analogous protrusions of high dimensional accuracy and minimum deterioration were produced by Reverse-µEDM using the LBµM fabricated tool plates.

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Section: Introductionmentioning

confidence: 99%

Laser Micromachining in Fabrication of Reverse-µEDM Tools for Producing Arrayed Protrusions

2022

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“…A diamond-shaped micro tube bank model can produce a vortex at a lower Re than a circle-shaped one. (Liu et al 2019;Qin et al 2019;Zhu et al 2017).…”

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confidence: 99%

Flow Characteristics and Vortex Structure of Flow Across Micro Cylinders by Micro-PIV Measurement and CFD Simulation

2023

JAFM

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The micro tube bank model is a commonly used structure in microelectro mechanical cooling systems. Flow across a micro tube bank is a basic benchmark for analyzing flow resistance and heat transfer capability. In this paper, the flow around a micro tube bank model was studied both experimentally and numerically. Micro-Particle Image Velocimetry technology was used to measure the flow field at different inlet flow rates. The laminar flow model, S-A model and standard k-ε model were used to calculate the flow field inside the micro tube bank model. By comparing the results from the three numerical models with the experimental results, there is a certain gap between them can be noted. However, it was found that the standard k-ε model is better than laminar model and S-A model in the comparison between numerical results and experimental results. In conclusion, the standard k-ε model is more suitable for the numerical calculation of the flow field around a micro scale tube bank model.

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Experimental study on the effect of shape on the boiling flow and heat transfer characteristics of different pin-fin microchannels

et al. 2021

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Micro-PIV and numerical study on influence of vortex on flow and heat transfer performance in micro arrays

Cited by 15 publications

References 29 publications

Laser Micromachining in Fabrication of Reverse-µEDM Tools for Producing Arrayed Protrusions

Laser Micromachining in Fabrication of Reverse-µEDM Tools for Producing Arrayed Protrusions

Flow Characteristics and Vortex Structure of Flow Across Micro Cylinders by Micro-PIV Measurement and CFD Simulation

Experimental study on the effect of shape on the boiling flow and heat transfer characteristics of different pin-fin microchannels

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