Numerical Simulation of Porous Media on Evaporation for an Anaesthesia Vaporizer
1 School of Medical Instrument and Food Engineering,University of Shanghai for Science and Technology, Shanghai 200093, China
2 School of Automotive Engineering， Tongji University, Shanghai 200092, China
Abstract：In order to improve the accuracy of anesthesia drug control and provide a theoretical basis for optimizing the structure of evaporator, the influence of physical characteristics of the porous medium evaporator core on the evaporation was investigated. Actual anesthetic evaporators were measured and a three-dimensional structure model was established with the Pro/E software. The effect of porous media on evaporation process in anesthesia vaporizer was simulated with CFD. Using FLUENT software, we analyzed the influence of physical properties of porous media on the performance of the evaporator and mixing process of the vaporized drugs with air. According to stochastic particle tracking in turbulent flow, the moving track of droplet of anesthesia drug in porous media space was traced. Then, the internal gas flow variation, the concentration distribution of drug volatilization process and mixing process with gas were obtained. Numerical simulation results showed that the porous media permeability, flow resistance during anesthesia drug volatilization and mixing process between anesthesia drug vapor and diluted gas all had influence on the accuracy and stability of the volatilization concentration for anesthesia drugs. The existence of porous medium reduced the flow rate of dilution gas. The increase of the porosity of porous media could promote drug evaporation and uniformity of the mixed gases. Due to the absorption of heat in the porous medium area, the maximum evaporation of drug was needed to determine the range of temperature compensation, ensuring the output stability and accuracy of the anesthetic drug concentration in the evaporator.
徐秀林1* 邹任玲1 胡秀枋1 杨帅2. 多孔介质对麻醉蒸发器蒸发效果影响的计算分析[J]. 中国生物医学工程学报, 2012, 31(1): 117-122.
XU Xiu Lin1*ZOU Ren Ling1 HU Xiu Fang1 YANG Shuai2. Numerical Simulation of Porous Media on Evaporation for an Anaesthesia Vaporizer. journal1, 2012, 31(1): 117-122.
