Spray Drying: Influence of Developing Drop Morphology on Drying Rates and Retention of Volatile Substances. 1. Single-Drop Experiments
Spray Drying: Influence of Developing Drop Morphology on Drying Rates and Retention of Volatile Substances. 1. Single-Drop Experiments
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喷雾干燥：形成液滴形态对干燥速率和挥发性物质保留的影响。
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
C. Judson King
中科院分区：
文献类型：
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作者：
John P. Hecht;C. Judson King
进行了精确的实验，其中干燥含有痕量SF6的单滴咖啡或蔗糖溶液。同时测量的干燥速率，SF6的损失率，滴温度，和物理外观的下降。研究了添加少量羧甲基纤维素（CMC）和十二烷基硫酸钠（SDS）对复合材料性能的影响。水和SF6的传质速率增加形态发展，或膨化。水的损失增加是由于内部气泡生长过程中液滴的拉伸和鼓泡过程中的混合引起的液相对流。在此期间的SF6损失是通过液相扩散到破裂的气泡。在液滴膨胀期间，来自增强的水损失的冷却效果通常足以将水蒸气冷凝在气泡中，从而导致防止破裂并选择性地去除水的膨胀-收缩循环。
Precise experiments were performed in which single drops of coffee or sucrose solutions containing a trace quantity of SF6 were dried. Simultaneous measurements were made of the drying rate, the loss rate of SF6, the drop temperature, and the physical appearance of the drop. The effects of adding small amounts of carboxymethyl cellulose (CMC) and sodium dodecyl sulfate (SDS) were also explored. Mass-transfer rates of water and SF6 increased during morphological development, or puffing. The enhanced loss of water was caused by liquid-phase convection resulting from stretching of the drop during internal bubble growth and mixing during bubbling. The loss of SF6 during this period was by liquid-phase diffusion into rupturing bubbles. The cooling effect from enhanced water loss during droplet inflation was often sufficient to condense the water vapor in a bubble, thereby leading to inflation-deflation cycles that prevent rupture and remove water selectively.