电子烟导油绳内传热传质规律的数值分析

Numerical analysis of heat and mass transfer law in the guide rope of electronic cigarette

【背景和目的】电热雾化器的工作性能是关系电子烟质量的重要因素之一,不同电热功率、导油绳的毛细作用都会对导油绳内的温度梯度、液体浓度梯度、烟油的汽化速率产生影响从而影响烟气品质,因此研究导油绳内的传热传质、场分布以及烟油汽化量的变化规律对电子烟雾化器的设计与改进具有重要意义。【方法】采用数值模拟的方法,建立电热丝与导油绳的传热模型、烟油在导油绳内的输运模型以及烟油达到相变点后的汽化模型,通过实验验证该模型的可靠性。【结果】在一定范围内,导油绳内径向最大温度梯度和浓度梯度随加热时间近似成二次函数关系;液体汽化量与加热时间近似成线性关系且随加热功率的增大而增加;干烧时间点随加热功率和扩散系数的增大分别成指数和对数关系递减。

[Background] The working performance of the electrothermal nebulizer is one of the key factors determining the quality of the electronic cigarette. The electrothermal power and capillary action of the guide rope will affect the temperature gradient, liquid concentration gradient and gasification rate of the e-liquid, thus posing a significant effect on the quality of the smoke. Therefore, the research on the heat and mass transfer, field distribution and vaporization amount of the e-liquid in the guide rope is of great significance to the design and improvement of the electronic cigarette nebulizer. [Methods] The numerical simulation method was used to establish the heat transfer model between the electric heating wire and the guide rope, the transport model of the e-liquid in the guide rope, and the gasification model of the e-liquid after the temperature of the e-liquid reached the phase transition point. On this basis, the reliability of the model was verified by experiments. [Results] Within certain limits, the maximum radial temperature gradient and concentration gradient in the guide rope presented approximately quadratic functions with heating time;the vaporization amount of liquid was approximate linearly with heating time, and increased with the heating power;the dry burning timing decreased exponentially and logarithmically with the increase of heating power and diffusion coefficient, respectively.