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
Flow measurement flow over the bluff body, and formula_17 is the Strouhal number, which is essentially a constant for a given body shape within its operating limits. Sonar flow meters are non-intrusive clamp on devices that measure flow in pipes conveying slurries, corrosive fluids, multiphase fluids and flows where insertion type flow meters are not desired. Sonar flow meters have been widely adopted in mining, metals processing, and upstream oil and gas industries where traditional technologies have certain limitations due to their tolerance to various flow regimes and turn down ratios. Sonar flow meters have the capacity of measuring the velocity of