Both of the flow models are used to predict the flow pattern of the complex fluid behavior.
Empirical approach use experimental data to make flow models and the correlated parameters are dimensionless. For instance, Moody diagram, where friction factors are the function of Reynolds number. Empirical flow models are hard to improve and usually have errors in the range of 20%.
Mechanistic flow models comparing to empirical one, talks about the complex flow occurrences in pipes. "The use of mechanistic models is expected to improve both its accuracy and extrapolation capability to any operation conditions" (Answers.com). The mechanistic model approaches include all important variables - laboratory and field data, which helps to predict methods.
mechanistic
It is an empirical formula.
C5H6O is the empirical formula for Cortisol.
An empirical formula has no data about the structure of a compound.
A molecular formula is identical to the empirical formula, and is based on quantity of atoms of each type in the compound.The relationship between empirical and molecular formula is that the empirical formula is the simplest formula, and the molecular can be the same as the empirical, or some multiple of it. An example might be an empirical formula of C3H8. Its molecular formula may be C3H8 , C6H16, C9H24, etc. Looking at it the other way, if the molecular formula is C6H12O6, the empirical formula would be CH2O.
Carl Westmoreland has written: 'The use of in vitro models for mechanistic studies in toxicology'
mechanistic
Definition of mechanistic
What are the advantages and disadvantages of mechanistic structure
What are the advantages and disadvantages of mechanistic structure
Taking a mechanistic approach to solving a problem involves seeing an organization as a machine and all its members as working parts of the machine. A mechanistic approach can be used when dealing with organizations, economies, and civilizations.
Why are mechanistic and organic structures suited to different organizational environments?
P. Kooiman has written: 'Using business survey data in empirical disequilibrium models'
James Sefton has written: 'The Phillips Curve in empirical macro-models of the world economy'
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Ralph W Tryon has written: 'Small empirical models of exchange market intervention' -- subject(s): Foreign exchange administration, Mathematical models
The main purpose of a scientific model is to represent empirical objects, physical processes and phenomena in a logical and objective way.