Droplet Vaporization In High-Pressure Environments I: Near Critical Conditions

Droplet Vaporization In High-Pressure Environments I: Near Critical Conditions
复制标题

高压环境中的液滴汽化一：接近临界条件

DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
V. Yang
V. Yang
中科院分区：
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文献类型：
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作者：
K. Hsieh;J. Shuen;V. Yang

文献摘要

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摘要 对近临界条件下多组分液滴汽化进行了综合分析。该模型基于完整的瞬态守恒方程，充分考虑了变量特性和汽液界面热力学。系统地研究了各种高压现象（包括环境气体溶解度、性质变化、热力学非理想性和瞬态扩散）对汽化机理的影响。作为一个具体的例子，研究了涉及氮气中正构烷烃燃料液滴的问题，结果表明，环境气压对汽化过程具有深远的影响，特别是对于液滴达到临界状态的条件。由于无法准确描述液滴行为，传统的低压模型可能会错误地显着高估蒸发速率。
Abstract A comprehensive analysis of multicomponent droplet vaporization at near critical conditions has been carried out. The model is based on complete time-dependent conservation equations, with a full account of variable properties and vapor-liquid interfacial thermodynamics. The influences of various high-pressure phenomena (including ambient gas solubility, property variation, thermodynamic non-ideality, and transient diffusion) on the vaporization mechanism are examined systematically. As a specific example, problems involving n-paraffin fuel droplets in nitrogen gas are studied, Results indicate that the ambient gas pressure has a profound impact on the vaporization process, especially for the conditions under which the droplet reaches its critical stale. Owing to its inability to accurately describe droplet behavior, the conventional low-pressure model may erroneously overpredict the evaporation rate significantly.