Question

The _______________ is an important dimensionless quantity in fluid mechanics that is used to help predict flow patterns in different fluid flow situations

• A. Reynolds number
• B. Viscosity
• C. Marks number
• D. Strokes formula

Answer 1

Answer: (A)

Reynolds number

Reynolds number, in fluid mechanics, a criterion of whether fluid (liquid or gas) flow is absolutely steady (streamlined, or laminar) or on the average steady with small unsteady fluctuations (turbulent). Whenever the Reynolds number is less than about 2,000, flow in a pipe is generally laminar, whereas, at values greater than 2,000, flow is usually turbulent.