Mass Transfer from Solid Wall into Gas-Liquid Slug Flow Fluid in Small Diameter Tube

本文中探討在不同液體與氣體流速下尿素管壁溶解進入氣液兩相流體之質量傳送，並以相同管徑之透明管觀察其氣液兩相流動之流態。實驗觀察顯示在本實驗操作條件下，空塔液體流速與空塔氣體流速皆介於0.05至0.20 m/s，6 mm管徑中之氣液兩相流態是為塊狀流動，且氣塊長度隨氣體流速之增大而增長。實驗結果也顯示在氣液兩相流動中之質量傳送明顯高於單一液相中之結果。本文指出在氣液兩相系統中，液體流速固定下之質傳送正比於通氣比，而質傳係數與氣塊流速為二次函數關係。

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並列摘要

The mass transfer rate of urea from a solid wall into a gas-liquid two-phase flow fluid was investigated under various liquid and gas velocities. The two-phase flow pattern in a small diameter tube was also visualized by using a transparent tube. Experimental observation showed that the two-phase flow pattern in a 6 mm diameter tube was slug flow under the experimental flow condition; i.e. , both the superficial liquid velocity and superficial gas velocity were varied from 0.05 to 0.20 m/s. The length of the gas slug increased with the increase in the gas velocity. Experimental results also show that the mass transfer rate under two-phase flow operation was significantly higher than that under single liquid-phase operation. In the two-phase system, the mass transfer coefficient was proportional to the gas injection ratio at a specified liquid velocity. A quadric relationship between the mass transfer coefficient and the gas slug velocity is proposed in this work.

並列關鍵字

Two-phase flow ； Mass transfer ； Hydrodynamics ； Gas slug velocity

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Mass Transfer from Solid Wall into Gas-Liquid Slug Flow Fluid in Small Diameter Tube

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