在多孔介質中溶質傳輸模擬時，一般常假設其溶質與多孔介質之間吸附、脫附作用瞬間達到平衡，其溶質穿越曲線為單S形狀。但滲流速度不低於某臨界流速時，瞬間平衡吸附假設不正確。在一般管柱實驗中所觀察到的溶質穿越曲線常為非瞬間平衡吸附模式的雙S形狀。滲流速度必需低於某臨界流速時，溶質穿越曲線形狀從雙S形狀變成單S形狀，此時瞬間平衡吸附假設趨於合理。
本研究在不同吸附速率、脫附速率及分配平衡常數等條件下，建立臨界流速之關係。當滲流速度小於或等於臨界流速時，工程師可以選擇瞬間平衡吸附模式預測溶質之穿越曲線。當滲流速度大於臨界流速時，工程師必需使用非瞬間平衡吸附模式。

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