As the geometric complexity of porous media brings about technical diffculties of the measurement and the visualization of the microscopic flow field, only few attempts have ever been made at the experimental examination of the two-phase flow through porous media. Therefore, we adopt a bank of tubes in a narrow gap as a porous model, and perform the visualization to examine the microscopic flow field for the horizontal two-phase flow through porous media in detail. The solid matrix in porous media plays an important role in the formation of the two-phase flow pattern. The solid matrix forces larger bubble than its representative length to be split, and the liquid bridge due to the capillary effect prevents the gas-phase merging together. Furthermore, the bubbles are trapped in the wide space surrounded with the solid matrices, where the compound bubble further absorbs smaller bubbles.

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