摘要
通过微型雾化器将药水雾化后吸入肺部是一种快速发展的新型医疗手段,具有疗效高、见效快、操作方便的优点。微型雾化器是该新型医疗手段的核心器件之一,其工作原理是通过电热丝加热一具有毛细作用的导液绳,导液绳与药液相接触,在加热过程中药液发生汽化后被吸入呼吸道。由于目前该领域对微型雾化器工作过程中的传热传质特性缺乏认识,为了深入研究微型雾化器的传热传质以及蒸发特性,获得液体在传输过程中温度、浓度、汽化量的变化以及改变加热功率、液体种类等参数对液体传输的影响规律,以此来探讨最佳雾化条件。采用计算机数值模拟的方法,首先建立了液体在微型雾化器中的传热传质模型,并通过与现有实验结果比较验证该模型的有效性和准确性,在此基础上研究关键因素对微型雾化器热质传递的影响。研究结果揭示了微型雾化器工作过程中导液绳内液体温度场、浓度场、汽化量以及汽化速率的变化规律,并获得了加热功率、扩散系数与液体汽化量之间的定量关系。针对所研究的微型雾化器,为了防止导液绳干烧,当加热功率在10W的情况下,加热时间需要控制在5s以内。
Micro-atomizer is one of the core devices of this new medical method.In order to further study the heat and mass transfer and evaporation characteristics of micro atomizer,obtain the changes of temperature,concentration and gasification amount in the transmission process of liquid and the influence law of changing heating power,mass transfer coefficient,liquid type and other parameters on liquid transmission,so as to explore the optimization of atomization.In this paper,the heat and mass transfer model of liquid in micro atomizer is established by means of computer numerical simulation.The validity and accuracy of the model are verified by comparing with the existing experimental results.On this basis,the influence of key factors on the heat and mass transfer of micro atomizer is studied.The results show that the temperature field,concentration field,vaporization amount and vaporization rate of the liquid in the guide line of the micro atomizer are changed,and the quantitative relationship among the heating power,diffusion coefficient and vaporization amount of the liquid is obtained.In order to prevent the liquid guide rope from dry burning,the heating time should be controlled within 5s when the heating power is 10W.
出处
《工业控制计算机》
2019年第12期7-11,共5页
Industrial Control Computer
关键词
微型雾化器
雾化吸入
传热传质
数值模拟
Micro-atomizer
atomization inhalation
heat and mass transfer
numerical simulation
