Example Reaction and Diffusion

The next example is a reaction-diffusion problem in a spherical domain. The reaction rate expression is a nonlinear function of concentration, of a type that is appropriate for the Michaelis-Menten reaction in biological systems. The nondimensional form of the problem is in Eq. (9.25), and it is solved for a = 5, X = 2. 

Follow these steps to solve this problem in FEMLAB. 

Step 1 Open FEMLAB, and choose Chemical Engineering, then Mass Transfer, then Diffusion, then Steady State. 

Step 2 Create the line by clicking on the line icon. Then move the cursor to the beginning of the line and draw to the end. 

Step 3 Define the mesh by clicking on the triangle symbol. First 15 elements are created, with 31 nodes. Successive clicks give 61 and 121 nodes. 

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