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Determine the mass transfer coefficient, kc, for the transfer from a glucose sphere, 0.3 cm in diameter, which is sub merged in a 25°C aqueous stream flowing at a bulk velocity of 0.15 m/s. The mass diffusivity of glucose in water at 25°C equals 6:9 × 10-¹⁰m²/s.

a. Estimate the mass transfer coefficient, k_L.

b. Determine whether increasing the diameter of the glucose sphere or increasing the velocity of the water stream effects the magnitude of the mass transfer coefficient, k_c. Which of these variables has the larger effect on the coefficient?

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