Heat and Mass Transfer

Heat and Mass Transfer: Steady state heat transfer in conduction, convection and radiation; transient heat transfer in simple geometry; working principles of heat exchangers; diffusive and convective mass transfer; simultaneous heat and mass transfer in agricultural processing operations; material and energy balances in food processing systems; water activity, sorption and desorption isotherms. The steady-state mass transfer coefficient (kg) based on water vapour pressure differential (VPD), operating across stagnant, non-diffusing air, was estimated to be 0.05 g mole s⁻¹ m⁻² kPa⁻¹. If VPD varies from 12 kPa to 7 kPa over a distance of 2 mm, the mass transfer coefficient (ky') based on equimolar counter-diffusion (g mole s⁻¹ m⁻² (mole fraction)⁻¹) (rounded to 1 decimal) is ______.