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<p>The rapid evolution of innovative manufacturing techniques is gradually phasing out traditional methods. This research delves into one such cutting-edge approach based on fluid shaping, leveraging Saffman-Taylor instability and the viscous fingering phenomenon by utilizing a setup known as the Lifting Plate Hele-Shaw Cell (LPHC). Through exploring the potential of this fluid dynamic behaviour, the study aims to understand the formation of net-shaped microstructures, particularly for applications in microchannel systems and microfluidics. The study underlines the significance of surface roughness on fractal growth. An analysis utilizing dimensionless numbers derived from geometric cell parameters such as fluid film thickness, surface roughness, and fluid film diameter correlated with fluid capillary number is employed to develop a deeper understanding. Six surfaces with differing roughness values ranging from 40&#xa0;μm to 2.5&#xa0;μm are tested alongside various separation velocities ranging from 2&#xa0;mm/min to 6&#xa0;mm/min in the LPHC. The research illustrates that when the surface roughness is very high, the fractal growth is driven by the geometric parameters, resulting in the fractals with shorter and wider fractals, while the fractals formed on the surfaces with very low roughness value are driven mainly due to the capillary action resulting into longer, thin and peaky fractals.</p>

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Controlling Viscous Pattern Formation in a Lifting Plate Hele-Shaw Cell Through Surface Roughness Modulation

  • 期刊论文

  • 发表日期：

    2025年1月25日

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  • Suraj Swami,
  • Shashank Phulmali,
  • Madan Narayanan,
  • Bharatbhushan S. Kale,
  • Kiran Suresh Bhole

摘要

The rapid evolution of innovative manufacturing techniques is gradually phasing out traditional methods. This research delves into one such cutting-edge approach based on fluid shaping, leveraging Saffman-Taylor instability and the viscous fingering phenomenon by utilizing a setup known as the Lifting Plate Hele-Shaw Cell (LPHC). Through exploring the potential of this fluid dynamic behaviour, the study aims to understand the formation of net-shaped microstructures, particularly for applications in microchannel systems and microfluidics. The study underlines the significance of surface roughness on fractal growth. An analysis utilizing dimensionless numbers derived from geometric cell parameters such as fluid film thickness, surface roughness, and fluid film diameter correlated with fluid capillary number is employed to develop a deeper understanding. Six surfaces with differing roughness values ranging from 40 μm to 2.5 μm are tested alongside various separation velocities ranging from 2 mm/min to 6 mm/min in the LPHC. The research illustrates that when the surface roughness is very high, the fractal growth is driven by the geometric parameters, resulting in the fractals with shorter and wider fractals, while the fractals formed on the surfaces with very low roughness value are driven mainly due to the capillary action resulting into longer, thin and peaky fractals.