Agricultural Engineering > GATE 2019 > Mass Transfer
The steady-state mass transfer coefficient (k_g) based on water vapour pressure differential (VPD) operating across stagnant, non-diffusing air was estimated to be 0.05 g mole s⁻¹ m² kPa⁻¹. If VPD varies from 12 kPa to 7 kPa over a distance of 2 mm, then the mass transfer coefficient (k_y') based on equimolar counter-diffusion in g mole s⁻¹ m⁻² (mole fraction)⁻¹ (rounded off to one decimal place) is
Correct : 4.6
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