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Particle‐liquid mass transfer in a three phase sparged reactor has been studied over a wide range of particle sizes, for the chum‐turbulent regime. The particle‐liquid Sherwood number has been correlated in the usual form with the Reynolds and Schmidt numbers. Use of the hindered particle settling velocity in the Reynolds number yields good agreement (±20%) with the present as well as most of the literature data. The proposed correlation also holds for power law non‐Newtonian liquids when the effective viscosity is used.

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Gas‐liquid and solid‐liquid mass transfer in three‐phase sparged reactor has been studied with and without super‐imposed ultrasound. The results show marginal enhancement in mass transfer coefficient due to ultrasound. Thus it has been concluded that the reported enhancement in the rates of heterogeneous reactions due to ultrasound is likely due to other, e.g., chemical, effects of ultrasound.

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