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

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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 lbf·s 2 /ft; 1 slug=32.2 lbm ¡ English Engineering (lbf, lbm, ft, s, o R) Properties of Fluids Density , ρ ¡ Density is the mass per unit volume Unit: slug/ft 3 or kg/m 3 Water: ρ = 1.94 slugs/ft 3 or 1000 kg/m 3 Air: ρ = 0.00237slugs/ft 3 or 1.22 kg/m 3 ¡ If ρ = 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 ( ρ =C) ¡ Otherwise, gas often treated as ideal gas P= ρ RT, (R value read in TA.2) Symbo Pressure P Density ρ Temperature T Gas Constant R 5 Symbol Pressure P Density ρ Temperature T Gas Constant R SI Pa (N/m...
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This note was uploaded on 05/22/2011 for the course ME 132 taught by Professor Dongmeizhou during the Spring '11 term at CSU Sacramento.

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

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