A spiral-wound membrane used for concentrating apple juice by reverse osmosis was first tested with pure water at temperatures from 20°C to 40°C. The flux was proportional to the transmembrane pressure for pressures up to 3 MPa, and the slope changed with temperature as shown in the table. 

(a) Does the permeability vary with T/μ, as suggested by the Wilke-Chang equation, or with some other function of T.μ and p? 

(b) What is the effective activation energy for transport of water through the membrane?

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T. °C Slope, L/h-m²- MPa 20 28.26 25 31.87 30 37.17 35 39.74 40 43.08