Please refer to Problem 28.16 above. At 600 K and 1.0 atm, under a new velocity for gas flow, the heat-transfer coefficient (h) is now 50 W/m² · K.
a. Compare average mass-transfer coefficient for CO mass transfer (k_c) using the Reynolds and Chilton–Colburn analogies. Based on the assumptions for each analogy, why are the values different?
b. Use boundary-layer theory to scale k_c for convective CO mass transfer to kc for convective CO₂ mass transfer.

Data From Problem 28.16

Consider the process shown in the figure (next page). A bulk gas stream containing 0.10 mole% of carbon monoxide (CO) gas, 2.0 mole% O₂ gas, and 97.9 mole% of CO₂ gas flows over a flat catalytic surface of length 0.50 m at a bulk velocity of 40 m/s at 1.0 atm and 600 K. Heat-transfer processes maintain the gas stream and catalytic surface at 600 K. At this temperature, the catalytic surface promotes the oxidation reaction CO(g) + 1/2O₂ (g) → CO₂(g). Let A = CO, B = O₂, C = CO₂. The gas-phase diffusion coefficients at 1.0 atm and 300 K are D_AB = 0.213 cm²/s, D_AC = 0.155 cm²/s, D_BC = 0.166 cm²/s.