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20.4Indicating the meaning of the symbols used, write mathematical expression for Raynoldnumber. How does its value determine the nature of flow of a fluid ? Show thatRaynold number is a pure number having no dimensions. |
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Answer» It is a dimensionless numbercomprised of the physical characteristics of the flow. An increasing Reynolds number indicates an increasing turbulence of flow.V is the flow velocity,D is acharacteristic linear dimension, (travelled length of the fluid;hydraulic diameteretc.)ρ fluid density(kg/m3),μ dynamic viscosity (Pa.s),ν kinematic viscosity (m2/s); ν = μ / ρ. |
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