“What happens when there is a fluid with more than one phase present?”
Most engineering or physics applications of fluid mechanics deal with only one phase of matter. However, what happens when there is there is a multiphase solution present, such as in shaving cream? Well, after much investigation, engineers and physicists have determined that such materials can not be treated as typical fluids and instead must be classified as complex fluids. Complex fluids exhibit often unusual stress-strain relations, are highly nonlinear, and relatively unknown. Perhaps readers of this blog will pursue research into this subject and illuminate us on this subject.