手术室内人员走动对手术区带菌粒子浓度的影响研究

Study on the Influence of Occupant Movement to Airborne Bacteria Concentration in Operating Region

k-ε双方程模型广泛地应用湍流模拟,使用拉格朗日法的随机轨道模型,进行带菌粒子运动,采用弹性系数法和动态垂构法,对护士来回走动所引起的气流变化进行数学模拟,计算的粒子沉降数,发现来回走动的护士的影响范围大约为其3倍的身宽,对手术区影响不大。

The widely applied k-ε two-equation mode is used in turbulence simulation, while random trajectory model based on Lagrangian approach is applied in the calculation of bacteria-infected particle movement. Elastic coefficient approach and dynamic reconstruction approach are practised in the numerical simulation of flow pattern on circulating nurse movement. The number of deposit particle on critical surgery site is calculated simultaneously. It is found that the width of quadratic flow caused by circulating nurse is three times of her body width, and will do little effect to the surgery site.