The table below gives water velocity as a function of distance from the ocean-sediment interface. Assume effects from surface winds are negligible and address the questions given below about the transfer of a chemical (A) from the sediment into water column. Some potentially useful additional data are also provided below:
Thermal conductivity = k2 = 05.7x10-3 W/cm/oC
Kinematic viscosity= v2=0.015 cm2/s
Thermal diffusivity= α =1.4 x 10-3 cm2/s
Molecular diffusivity=DA2=10-5 cm2/s
Density= ρ2 =1.0 g/cm3
a) One way to estimate a mass transfer coefficient at a sediment-water interface is to assume that the diffusive sublayer is the controlling resistance. Estimate a mass transfer coefficient based on this assumption (cm/s).
b) Another way to estimate a sea bottom liquid phase mass transfer coefficient is to assume the diffusive sublayer is not the controlling resistance. Estimate a mass transfer coefficent based on this assumption (cm/s).