论文标题
磁场下的微流体通道中的水蒸发
Evaporation of water in a microfluidic channel under magnetic field
论文作者
论文摘要
通过同时监测两个样品的形状来研究，将一滴水的滴水蒸发在长聚聚（甲基丙烯酸甲酯）微流体通道的中心，矩形横截面为0.38 mmm2，其中一个是在两个样品的形状中，一个是在300 mt磁场中，另一个在没有场中。观察到高达140％的蒸发速率的磁力增强，可以通过将水蒸气的正核和核异构体视为与Quasi独立的Gasses的矫正核异构体，在接近2：3的新鲜蒸气中具有正式蒸汽比率为ortho：para的比例。在通道中实验的2-4 h持续时间要长得多，才能接近3：1平衡值。磁场通过在蒸气相中均衡异构体种群来影响蒸发率。通道中的大气充满了水蒸气，但蒸发速率远远超过开放式烧杯。
The evaporation of drops of water placed at the center of long poly(methyl methacrylate) microfluidic channels with a rectangular cross section of 0.38 mm2 is studied by simultaneously monitoring the shapes of two samples, one is in a 300 mT magnetic field, the other is in no field. A magnetic enhancement of the evaporation rate of up to 140 % is observed, which can be understood by treating the ortho and para nuclear isomers of water vapor as quasi-independent gasses with an ortho:para ratio in fresh vapor close to 2:3. It would take much longer than the 2 - 4 h duration of an experiment in the channel, for the ratio to approach the 3:1 equilibrium value. Magnetic field influences evaporation rate by equalizing the isomeric populations in the vapor phase. The atmosphere in the channel is saturated with water vapor yet the evaporation rate far exceeds that in open beakers.
