Friction friction and wear in so-called self-lubricating materials. Fluid friction occurs between fluid layers that are moving relative to each other. This internal resistance to flow is named "viscosity". In everyday terms, the viscosity of a fluid is described as its "thickness". Thus, water is "thin", having a lower viscosity, while honey is "thick", having a higher viscosity. The less viscous the fluid, the greater its ease of deformation or movement. All real fluids (except superfluids) offer some resistance to shearing and therefore are viscous. For teaching and explanatory purposes it is helpful to use the concept of an inviscid fluid
Experiments in Fluids C. Tropea (Technical University of Darmstadt, Germany) and J. Westerweel (Laboratory for Aero & Hydrodynamics, Delft University of Technology, Netherlands). The founding editors are J. H. Whitelaw (Imperial College, United Kingdom) and W. Merzkirch (University of Essen, Germany). Jim Whitelaw served the journal from 1982 until 1999; Wolfgang Merzkirch was with the journal from 1982 until 2002. Experiments in Fluids Experiments in Fluids is a scientific, peer-reviewed scientific journal published monthly by Springer Science+Business Media. The journal presents contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in specific areas. These areas include turbulence,