甲醇-生物柴油体系单液滴的蒸发特性

基于传热传质理论，建立了二组分体系单液滴在对流热空气环境中的蒸发模型。通过对比实验数据，验证了模型的正确性。以甲醇 生物柴油混合燃料为研究对象，分析了环境温度、环境压力、甲醇掺混比例、气流强度对液滴蒸发特性的影响。结果表明，甲醇 生物柴油体系液滴的蒸发过程可以分为甲醇先蒸发和生物柴油后蒸发两个阶段。当环境温度从400 K上升到600 K时，液滴的蒸发时间缩短951%；当甲醇的掺混比例从10%增加到50%时，液滴的蒸发时间缩短177%；当空气速度从1 m/s增加到5 m/s时，液滴的蒸发时间缩短295%；随环境压力的升高，液滴蒸发时间延长。在液滴蒸发过程中，液滴表面温度迅速上升到环境温度，且随着环境温度的升高明显上升，但受环境压力、甲醇比例、气流强度的影响不大。

Evaporation Characteristics of Single Droplet in Methanol Biodiesel System

Based on the heat and mass transfer theory, an evaporation model for single droplet of bi component in the convection heat air environment was established. By comparison of the experimental and calculated results, the correctness of the model was verified. Taking methanol biodiesel mixture as the research object, the effects of the ambient temperature, ambient pressure, methanol blending ratio and flow intensity on the droplet evaporation characteristics were analyzed. The results showed that the droplet evaporation process of methanol biodiesel system could be divided into two stages, methanol evaporation first and then biodiesel evaporation. The evaporation time of the droplet was shortened by 951%, 177%, 295%, respectively, when the ambient temperature increased from 400 K to 600 K, the methanol mixing ratio increased from 10% to 50%, the air velocity increased from 1 to 5 m/s. But the evaporation time was extended with the increase of the ambient pressure. In the evaporation process of the droplet, the droplet surface temperature increased to the ambient temperature rapidly, and was obviously increased with the increase of the ambient temperature, however, was slightly influenced by the ambient pressure, methanol blending ratio and flow intensity.