Ch1-2 - 1 Fluid Property & Unit System Main...

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Unformatted text preview: 1 Fluid Property & Unit System Main Topics Unit System Properties of Fluids Temperature, Density, Pressure Mass, Weight, Specific weight Specific gravity Viscosity 1 Viscosity Chapter1 & Chpater2: 2.1~2.5 Systems of Units Property Is anything owned by someone such as land, building goods building, goods, Property of fluid Is the physical quantity owned by a fluid Property often described with variables Physical properties must be stated with units why? 2 units ( why? ) 2 Systems of Units A system of units Basic units & derived units Specify units of basic quantities of mass or force, length, time, temperature Units for other terms derived from basics In this course, two systems of units used SI, International System, (kg, m, s, K) 3 US Customary System, (lbf, ft, s, o R) mass : 1 slug = 1 lbfs 2 /ft; 1 slug=32.2 lbm English Engineering (lbf, lbm, ft, s, o R) Properties of Fluids Density , Density is the mass per unit volume Unit: slug/ft 3 or kg/m 3 Water: = 1.94 slugs/ft 3 or 1000 kg/m 3 Air: = 0.00237slugs/ft 3 or 1.22 kg/m 3 If = constant, the flow is i ncompressible If density varies significantly, the flow is 4 compressible Density of liquids Most liquids: density =constant 3 Properties of Fluids Density of Gases Gases are easy to compress If no large pressure fluctuations, gas treated as incompressible ( =C) Otherwise, gas often treated as ideal gas P= RT, (R value read in TA.2) Symbo Pressure P Density Temperature T Gas Constant R 5 Symbol Pressure P Density Temperature T Gas Constant R SI Pa (N/m...
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Ch1-2 - 1 Fluid Property & Unit System Main...

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