管壁の微小弾性変形を考慮したレーザー誘起パルス液体ジェットの数値解析モデルの開発及び液体ジェットの特性評価

概要

論文の詳細を見る
Laser-Induced Liquid Jet (LILJ) is a promising surgical knife because it reserves blood vessel and emits less heat. LILJ is ejected at high speed by shock wave and expansion wave caused by the pulsed laser focusing. In practice, strong shock and expansion wave bring elastic deformation of the thin tube wall as well. In this study, we try to develop a numerical model to analyze the effect of wall elasticity in jet formation. A simple model that can be implemented as a boundary condition into an existing algorithm for two-phase flow simulation is proposed. The model has been validated in the simulation of an oscillating high pressure channel with steel and acrylic walls. The wall displacement and the wall pressure are resolved well with a good spatial and temporal convergence. In the simulation of LILJ based on the elastic wall model, it was found that a low pressure zone may appear in a short duration in the tube, and the shape of the water jet agrees better with experimental results than that based on the rigid wall model.