Summary of the Model Building Process

Draw a sketch of the system to be modeled and label/define the various geometric, physical and chemical quantities. 

Carefully select the important dependent (response) variables. 

Select the possible independent variables (e.g., z, t), changes in which must necessarily affect the dependent variables. 

List the parameters (physical constants, physical size, and shape) that are expected to be important also note the possibility of nonconstant parameters [e.g., viscosity changing with temperature, piT)]. 

Draw a sketch of the expected behavior of the dependent variableCs), such as the expected temperature profile we used for illustrative purposes in Fig. 1.3. 

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