高速エアジェットによる壁面付着粒子除去に関する研究:― 第2報　低流量型ノズルの性能評価 ―

概要

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We investigated the removal mechanism for fine particles from a surface using a high-speed air jet. Generally, it is difficult to remove fine particles of the order of micrometers by the impingement of simple air flow because they strongly adhere to the surface by van der Waals force and remain immersed in the viscous sublayer of the air flow. To overcome this issue, we developed nozzles with triangular cavities that add strong velocity and pressure fluctuations to a high-speed air flow. Previously, we reported that the fluctuations generated in the cavities improved particle removal. In this study, we designed nozzles with a narrower gap width containing cavities, which provide high performance and require a lesser flow rate for efficiently cleaning large surfaces. Experimental results show that the newly designed 0.2-mm-wide nozzle with triangular cavities exhibits a better particle removal rate than previous nozzles, in spite of the flow rate being approximately half of the previous one. In addition, we estimated adherence and removal forces. The dominant removal force is not drag or lift force, but the pressure gradient induced by the impingement of a strongly turbulent air flow. The predicted relation between particle size and particle removal rate from the estimation agrees with the experimental results.
日本実験力学会の論文