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首页> 外文期刊>Environmental Science & Technology >Mobilization and Rupture of LNAPL Ganglia during Freeze-Thaw: Two-Dimensional Cell Experiments
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Mobilization and Rupture of LNAPL Ganglia during Freeze-Thaw: Two-Dimensional Cell Experiments

机译:冻融过程中LNAPL神经节的动员和破裂:二维细胞实验

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摘要

Experiments were conducted on dodecane at residual saturation (21 -26%) in a two-dimensional water-saturated glass bead cell (0.5 mm diameter)-to simulate light nonaqueous phase liquid (LNAPL) trapped below the water table-subject to controlled freeze-thaw cycles. The experiments reveal substantial remobilization and rupture of LNAPL ganglia during freeze-thaw, especially during the first few cycles. This includes the detachment and upward mobilization of LNAPL from larger ganglia during upward propagation of the freezing front; the formation of numerous subsinglet ganglia during this transport process, and their entrapment in ice; and the coalescence of such small ganglia during thawing, to form larger singlets. Theoretical calculations suggest that the LNAPL redistribution is caused by large freezing-induced pressure gradients, of up to 6 orders of magnitude higher than the water-LNAPL interfacial (capillary) pressure. The findings have important implications for the understanding and remediation of LNAPLs in cold climate regions.
机译:在二维水饱和玻璃珠小室(直径为0.5 mm)中,以残留饱和度(21 -26%)的十二烷进行实验,以模拟陷于地下水位以下的轻质非水相液体(LNAPL),以控制冻结-解冻周期。实验揭示了冻融过程中LNAPL神经节的大量移动和破裂,尤其是在最初的几个循环中。这包括在冻结锋的向上传播过程中,LNAPL从较大的神经节中脱离和向上动员;在此运输过程中形成许多子小神经节,并将其困在冰中;这种小神经节在融化过程中会聚结,形成更大的单线态。理论计算表明,LNAPL重分布是由较大的冷冻诱导压力梯度引起的,比水-LNAPL界面(毛细管)压力高多达6个数量级。这些发现对于寒冷地区对LNAPL的理解和补救具有重要意义。

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  • 来源
    《Environmental Science & Technology》 |2008年第15期|5467-5472|共6页
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  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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