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and denote the volume fractions of the continuous phase and the dispersed phase (SI unit: m3/m3), respectively
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j is the velocity vector (SI unit: m/s)
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ρ is the density (SI unit: kg/m3)
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p is the pressure (SI unit: Pa)
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ε is the reduced density difference (SI unit: kg/kg)
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uslip is the slip velocity vector between the two phases (SI unit: m/s)
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jslip is the slip flux (SI unit: m/s)
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g is the gravity vector (SI unit: m/s2), and
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F is any additional volume force (SI unit: N/m3)
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