3. A bioengineered porous scaffold is used for cell attachment in neural tissue engineering studies. The scaffold has uniform cylindrical pores with 5m in diameter and 20m in length. In a cell culture, oxygen is diffusing through the pores of the scaffold in oxygen+nitrogen mixture at 1atm and 37C. Oxygen mole fractions are 0.05 and 0.20atm at the two ends of the scaffold. If the flux ratio is NA=NB, calculate the total molar flux of oxygen. Molecular diffusivity of oxygen in nitrogen is 0.181104m2/s at 1 atm and 0C and viscosity of oxygen at operating conditions is 0.019cP.(20p)