There are some different situation in that. First of all concentration and size can affect the agglomeration and because of that reason nanoparticles become microparticles and are no longer useful, in fact, based on their material they even behave like abrasives. This will lead to increase in surface roughness and cutting forces. Also there are other things like filling effect of nanoparticles (such as fill the gap if there is a microcrack), if their size become higher they can not do that. Also their specific heat changes when their size increase. All these things directly affect the machining outputs like cutting forces, roughness and tool wear.

In addition to the Ramazan Hakkı Namlu answer, it will also depend on the type of machining process and which nanoparticles are used.

Gradually, the number of reviews on the subject has been growing, with specific studies on the effects of each of the nanofluids, their applications in each process and interactions with materials.

Authors who are working on nanofluid machining please suggest or recommend some paper related to particle size Of nanofluid used and its effect on wettability and tribological behaviour in turning operation.