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基于數值模擬的氣液相界面積計算方法

Computation method of gas-liquid interfacial area based on numerical simulation results

  • 摘要: 相界面積對氣液兩相流中傳熱、傳質、物理化學反應等動力學過程影響重大.為獲取這一參數,提出一種根據兩相流數值模擬結果計算相界面積的方法.此方法借鑒分段線性重構界面的思想,在各網格單元內以平面近似真實相界曲面,根據目標流體的體積分數及其梯度向量將網格內相界面形貌歸為五類,進而采用不同的方法分別計算各類相界面的面積.在銅轉爐熔池內兩相流數值模擬結果分析中的應用效果表明:該方法能有效提取兩相流體系中任意區域的相界面積,從而為體系動力學特征的定量分析提供依據.利用相界面積數據,進一步計算了氧氣利用率并識別出熔池內‘高效反應區’,計算和識別結果與工程實際吻合,證實了該方法的準確性.

     

    Abstract: The gas-liquid inteffacial area has significant influence on kinetic processes, such as heat transfer, mass transfer and physiochemical reactions in two-phase flow. A new method for getting this parameter is introduced to compute the inteffacial area with the numerical simulation results of two-phase flow. Referring to the idea of a piecewise linear interface calculation (PLIC) method, it uses a plane in each cell to approximate the real curved interface between two phases, these planes are then categorized into five types according to the volume fractions of the target fluid and their gradient vectors in each cell, and the inteffacial areas are respectively calculated by different equations for different plane types. This method is applied in analyzing the numerical simulation results of a copper converter. It is shown that this method can extract the interfacial area of any spatial region effectively in a two-phase flow system and can be used in analyzing the features of kinetic processes quantitatively in a two-phase dispersion system. Moreover, by using the computed interfacial area, the oxygen utilization ratio is calculated and the "highly efficient reaction zone" in the bath is recognized. The results agree with practical data and experience, indicating the accuracy of the proposed method in some extent.

     

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