For prolonged working of microstructured devices such as integrated circuits and micro-electro-mechanical devices (MEMS), effective cooling solutions are mandatory. This utilizes two phase cooling strategies employed in micro-heat pipes, capillary pump loops, thermosiphons, etc. The evaporating thin film meniscus is observed in the domain of the aforementioned. It harbors potential for high evaporative mass flux and heat flux. The fluid flow and heat flow characteristics of the thin film meniscus can be evaluated by determining its thickness profile. The existing work explicitly measures the thickness profile of octane in the micro region. This work chiefly explores the effect of introducing surface acoustic wave (SAW) for different cases (Wea = 92.87, 120.01) on the working liquid meniscus. The generation of small droplets near the thin film meniscus is noticed pertaining to the piezoelectric transducer below the substrate. The observation suggests transformation of the acoustic energy from the transducer into kinetic energy in the fluid causing strong capillary waves at the interfacial region near adsorbed region that results in generation/ejection of droplets. The followed-up discussion deduces the replenishment of flow towards the transition region from the intrinsic meniscus based on the curvature profile. The calculated pressure gradient responsible for driving the liquid flow proclaims an increase in the liquid flow with increasing SAW.

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Effect of Surface Acoustic Wave (SAW) on the Thickness Profile of an Evaporating Thin Film Meniscus Using Reflectometry

  • Saumya Singh,
  • Ankit Kumar,
  • Soubhik Kumar Bhaumik,
  • S. Narayanan,
  • Pawan Kumar Singh

摘要

For prolonged working of microstructured devices such as integrated circuits and micro-electro-mechanical devices (MEMS), effective cooling solutions are mandatory. This utilizes two phase cooling strategies employed in micro-heat pipes, capillary pump loops, thermosiphons, etc. The evaporating thin film meniscus is observed in the domain of the aforementioned. It harbors potential for high evaporative mass flux and heat flux. The fluid flow and heat flow characteristics of the thin film meniscus can be evaluated by determining its thickness profile. The existing work explicitly measures the thickness profile of octane in the micro region. This work chiefly explores the effect of introducing surface acoustic wave (SAW) for different cases (Wea = 92.87, 120.01) on the working liquid meniscus. The generation of small droplets near the thin film meniscus is noticed pertaining to the piezoelectric transducer below the substrate. The observation suggests transformation of the acoustic energy from the transducer into kinetic energy in the fluid causing strong capillary waves at the interfacial region near adsorbed region that results in generation/ejection of droplets. The followed-up discussion deduces the replenishment of flow towards the transition region from the intrinsic meniscus based on the curvature profile. The calculated pressure gradient responsible for driving the liquid flow proclaims an increase in the liquid flow with increasing SAW.