Background: Nanoparticle aggregation affects nanofluid thermal conductivity.
Objective: Several aspects of aggregation modeling pertinent to nanofluid thermal conductivity estimation
are to be discussed.
Method: Mathematical analysis is performed using the macroscopic aggregation equations.
Results: Some plausable types of models are identified and their positive and negative features evaluated.
A number of explicit solutions relevant to nanofluid thermal conductivity modeling are presented.
Conclusion: Modeling techniques of varying levels of sophistication exist which should be further
pursued and evaluated.