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首页> 外文会议>Australasian Conference on Computational Mechanics >Numerical Simulation of Flow, Heat and Moisture Transfer in Heat and Moisture Exchanger (HME) Devices
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Numerical Simulation of Flow, Heat and Moisture Transfer in Heat and Moisture Exchanger (HME) Devices

机译：热水交换器（HME）器件流量，热和水分转移的数值模拟

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Heat and Moisture Exchanger (HME) is a simple solution to the problems of warming and humidification of inspired gases during ventilator treatment. The device acts as an "artificial" nose or passive humidifier, added to the breathing circuit to retain and exchange heat and moisture between inspiration and expiration. The HME traps expiratory heat and moisture from patient's exhaled breath in a porous medium and returns a portion of them through the subsequent inspiratory cycle. The aim of our paper is to develop a computational fluid dynamics (CFD) model of an HME device commonly used in anaesthesia and intensive care. The CFD results allow a better understanding of flow behaviour leading to the design of more efficient devices. The CFD model solves the gas flow, heat and mass transfer equations in a DAR Hygrobac S (Mallinckrodt DAR, Mirandola, Italy). The temperature, absolute humidity and pressure fields are obtained during expiratory phase to evaluate heat and moisture conserving efficiencies and air flow resistance. The effect of flow rate as one of the major parameters in ventilator setting on temperature, humidity and pressure drop is determined. Inside the HME device, areas of recirculation are observed. As the flow rate increases the output temperature and absolute humidity go up causing a reduction in heat and moisture conserving capacities. Comparison of the CFD results with previously obtained experimental data shows a satisfactory agreement.
机译：热水和水分交换器（HME）是一种简单的解决方案，用于在呼吸机治疗期间对鼓风机的热化和加湿问题的问题。该装置用作“人工”鼻子或被动加湿器，添加到呼吸回路中，以保留和交换灵感和呼气之间的热量和水分。 HME陷阱在多孔介质中呼出患者呼出气息的热量和水分，并通过随后的吸气循环返回它们的一部分。我们的论文的目的是开发一种常用于麻醉和密集护理的HME设备的计算流体动力学（CFD）模型。 CFD结果允许更好地理解流动，导致更有效的设备的设计。 CFD模型解决了Dar Hygrobac S（Mallinckrodt Dar，意大利Mirandola）中的气流，热和传质方程。在呼气阶段获得温度，绝对湿度和压力场，以评估热量和水分效率和空气流动阻力。确定流速作为温度，湿度和压降呼吸机设置中的主要参数之一的影响。在HME设备内部，观察到再循环区域。随着流量的增加，输出温度和绝对湿度上升，导致耐热和水分保存能力降低。使用先前获得的实验数据的CFD结果的比较显示了令人满意的协议。

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