Computational fluid dynamics by Blazek J.

By Blazek J.

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The angle of contact “β” defines the concavity or convexity of the liquid surface. 1) At the surface this contact angle will be maintained due to molecular equilibrium. The result of this phenomenon is capillary action at the solid liquid interface. The curved surface creates a pressure differential across the free surface and causes the liquid level to be raised or lowered until static equilibrium is reached. 13. 3N. 3 = 2 × 1 × Surface tension. 15 N/m. 2. Let D be the diameter of the tube and β is the contact angle.

What will be the percentage increase in specific volume? The definition of bulk modulus, Ev = – dp/(dv/v) is used to obtain the solution. 20. Density of sea water at the surface was measured as 1040 kg/m3 at an atmospheric pressure of 1 bar. At certain depth in water, the density was found to be 1055 kg/m3. Determine the pressure at that point. The bulk modulus is 2290 × 106 N/m2. 59 bar. 1 Expressions for the Compressibility of Gases The expression for compressibility of gases for different processes can be obtained using the definition, namely, compressibility = – dp/(dv/v).

9. The vapour pressure over a liquid _________ when other gases are present in addition to the vapour. 10. As cohesive force _________ compared to adhesive forces, the capillary will rise. 8 Indicate whether the statements are correct or incorrect. 1. Density is the ratio of mass of unit volume of liquid to the mass of unit volume of water. 2. In the gas equation temperature should be used in Kelvin scale. 3. Specific weight is the mass of unit volume. 4. The cohesive forces are highest in gases.

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