GIVEN A dimensionless combination of variables that is important in the study of viscous flow through pipes is called the Reynolds number, Re, defined as VD/ where, as indicated in Fig. E1.4, is the fluid density, V the mean fluid velocity, D the pipe diameter, and the fluid viscosity. A Newtonian fluid having a viscosity of 0.38Ns/m2 and a specific gravity of 0.91 flows through a 25mm-diameter pipe with a velocity of 2.6m/s. FIND Determine the value of the Reynolds number using (a) SI units and (b) BG units. SOLUTION (a) The fluid density is calculated from the specific gravity as =SGH,OesC=0.91(1000kg/m3)=910kg/m3 (1.28) SAE 30 oil at 95F flows through a 1.2-in.-diameter pipe with a mean velocity of 6ft/s. Determine the value of the Reynolds number (see Example 1.4)