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Unformatted text preview: 1 Fluid Property & Unit System Main Topics ยก Unit System ยก 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 ยก Is anything owned by someone such as land, building goods building, goods, โฆ Property of fluid ยก Is the physical quantity owned by a fluid ยก Property often described with variables ยก Physical properties must be stated with units why? 2 units ( why? ) 2 Systems of Units A system of units ยก Basic units & derived units ยก Specify units of basic quantities of mass or force, length, time, temperature ยก Units for other terms derived from basics In this course, two systems of units used ยก SI, International System, (kg, m, s, K) 3 ยก US Customary System, (lbf, ft, s, o R) mass : 1 slug = 1 lbfยทs 2 /ft; 1 slug=32.2 lbm ยก English Engineering (lbf, lbm, ft, s, o R) Properties of Fluids Density , ฯ ยก Density is the mass per unit volume Unit: slug/ft 3 or kg/m 3 Water: ฯ = 1.94 slugs/ft 3 or 1000 kg/m 3 Air: ฯ = 0.00237slugs/ft 3 or 1.22 kg/m 3 ยก If ฯ = constant, the flow is i ncompressible ยก If density varies significantly, the flow is 4 compressible Density of liquids ยก Most liquids: density =constant 3 Properties of Fluids Density of Gases ยก Gases are easy to compress ยก If no large pressure fluctuations, gas treated as incompressible ( ฯ =C) ยก Otherwise, gas often treated as ideal gas P= ฯ RT, (R value read in TA.2) Symbo Pressure P Density ฯ Temperature T Gas Constant R 5 Symbol Pressure P Density ฯ 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.
 Spring '11
 DongmeiZhou

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