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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental study on transient heat/mass transfer characteristics during static flash of aqueous NaCl solution
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Experimental study on transient heat/mass transfer characteristics during static flash of aqueous NaCl solution

机译：NaCl水溶液静态闪蒸过程中瞬态传热/传质特性的实验研究

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摘要

The instant height/temperature of waterfilm were selected as a pair of characteristic parameters to study the transient heat/mass transfer properties during static film flash of aqueous NaCl solution though experiments with waterfilm concentration ranging between 0 and 0.15 (mass fraction), superheat between 5.1 and 35.0 K, and initial height of waterfilm between 0.10 and 0.20 m. The heat transfer mainly happened at bubble interface within waterfilm. The mass transfer included two steps of vaporization at bubble interface and vapor overflow from top free surface. The transient intensity of heat transfer was measured by volumetric evaporation coefficient. It shared the same experience with volumetric void fraction of quick increase to a peak value and gradual falling back. But its change always lagged behind that of void fraction. The transient intensity of overflow was measured by overflow speed of flash vapor. It was found to increase with rising superheat or initial height of waterfilm, but dropped significantly with increasing waterfilm concentration. On basis of these results, a calculation model for static film flash was set up. The evolution of waterfilm temperature/height could be computed simultaneously from given evolution of flash chamber pressure and other necessary initial conditions.
机译：选择水膜的瞬时高度/温度作为一对特征参数，以研究NaCl水溶液静态膜闪蒸过程中的瞬态传热/传质特性，尽管实验的水膜浓度范围为0至0.15（质量分数），过热度为5.1和35.0 K，水膜的初始高度在0.10和0.20 m之间。传热主要发生在水膜内的气泡界面。传质包括两个步骤：气泡界面的汽化和蒸汽从顶部自由表面溢出。传热的瞬态强度通过体积蒸发系数测量。它具有相同的经验，体积的空隙率迅速增加到峰值，然后逐渐回落。但是它的变化总是落后于空隙率的变化。溢流的瞬时强度通过闪蒸气的溢流速度来测量。发现它随着过热度或水膜初始高度的增加而增加，但随着水膜浓度的增加而显着下降。基于这些结果，建立了静态胶片闪光的计算模型。可以根据给定的闪蒸室压力和其他必要的初始条件同时计算水膜温度/高度的变化。

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