8. A gas is admitted at a rate of 0.015 m³s-¹ to a vertical glass pipe with an inside diameter of 50 mm. The gas bubbles that form travel with a velocity of 32 ms-¹. Determine the gas void fraction and the velocity of the liquid if the volumetric flow is 2.5 x 10-5 m³s-¹. Answer: 0.24, 1.7 ms-¹

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