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2_-_Properties

# 2_-_Properties - UNIT 2 INTRINSIC FLUID PROPERTIES (2010...

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UNIT 2 INTRINSIC FLUID PROPERTIES Chapter 1 from Houghtalen et al. (2010)

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What properties describe the differences between fluids? Homsy et al 2007
Mass Density ( ρ ) The mass density ( ρ ) or just density is defined as mass per unit volume. Units of slugs per cubic foot (slugs/ft 3 ) or kilograms per cubic metre (kg/m 3 ) V M = ρ

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function CalcWaterDensity(T) % lookup and plotting function for water density versus temperature % T is a vector of water temperatures water.temp = [100 80 60 40 30 25 22 20 15 10 4 0 -10 -20 -30]; water.density = [958.4 971.8 983.2 992.2 995.6502 997.0479 997.7735… 998.2071 999.1026 999.7026 999.9720 999.8395 998.117 993.547 983.854]; % yi = interp1(x,Y,xi,method) rho = interp1(water.temp,water.density,T,'spline'); plot(T,rho); xlabel('temperature (\circ C)'); ylabel('density (m^3 s^{-1})'); title('Density of Water');
Lake temperature s

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Lake Turnover
Specific Weight ( γ ) (or Weight Density) [F L -3 ] or N m -3 or lb f ft -3 V W = γ Defined as the unit weight per volume: g = ρ γ

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Specific Gravity defined as the ratio of the specific weight of the substance to the specific weight of water w S γ γ = - dimensionless

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Standard Conditions Fluid properties are typically referenced to a standard temperature and pressure. Typically use 4 o C as a standard temperature. Standard pressure is the sea level pressure of a standard atmosphere (approximate mean conditions at 40° latitude) and is equal to 101.3 kPa. With the international system of units the properties of water are: 3 4 3 3 4 9806 1000 00 . 1 m N m kg cm g C C o o = = = γ ρ
Example problem 1 A tank containing 1200 kg of glycerine has a volume of 0.952 m 3 . Find: 1. The weight of the glycerin; 2. The mass density of the glycerin; 3. The specific weight of glycerin; and 4. The specific gravity of glycerin.

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Specific volume ( ν ) the volume occupied by a unit mass of a fluid (m 3 /kg) ρ 1 = v reciprocal of density

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Bulk or Elastic Modulus (E v ) The compressibility of a liquid is inversely proportional to its bulk modulus of elasticity, also known as the elastic or bulk modulus.
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2_-_Properties - UNIT 2 INTRINSIC FLUID PROPERTIES (2010...

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