松散润叶筒三维传热传质过程数值模拟
Three-dimensional heat and mass transfer model and numerical simulation of moistening cylinder
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摘要: 为研究松散润叶筒内部热湿环境分布,通过构建真实比例的三维松散润叶筒模型,采用计算流体力学(CFD)方法数值模拟松散润叶筒内部的三维传热传质过程,并根据温度和含水率对喷雾喷射角和筒体倾角进行优化。结果表明:模拟值与实验值整体吻合良好,温度平均相对误差为0.6%,所建立的 CFD 模型真实有效;轴向气相温度呈阶段式变化,前半段温度迅速升高,后半段温度稳定在341.0 K左右;雾化水和水蒸气向烟叶持续传质传热,使得轴向烟叶温度、含水率逐步提高,最终出料口烟叶温度达326.3 K,含水率达17.21%;筒体倾角为3°、喷雾喷射角为45°时,烟叶加湿加热效果最佳。Abstract: In order to study the distribution of heat and moisture environment inside the moistening cylinder, a three-dimensional moistening cylinder model with real proportion was constructed. The three-dimensional heat and mass transfer process inside the moistening cylinder was numerically simulated by computational fluid dynamics (CFD) method, and the spray angle and cylinder inclination angle were optimized according to temperature and moisture content. The results showed that the simulated values were in good agreement with the experimental values, and the average relative error of temperature was 0.6%. The established CFD model was real and effective. The temperature of the gas phase in the axial direction changes in stages. The temperature in the first half increased rapidly, and the temperature in the second half was stable at about 341.0 K. The continuous mass and heat transfer of atomized water and water vapor to tobacco leaves gradually increased the temperature and moisture content of tobacco leaves in the axial direction. The temperature of tobacco leaves at the final discharge port reached 326.3 K, and the moisture content reached 17.21%. Through further research, the optimization suggestions for the process conditions of the moistening cylinder are put forward: the inclination angle of the cylinder should be selected as 3°, and the spray angle should be selected as 45°.
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Key words:
- moistening cylinder /
- tobacco /
- heat transfer /
- mass transfer /
- numerical simulation
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