Question

surface 13. Saturated vegen "The change in its 10 17.4 23.8 c. 30.5 a 339 1.4. When the vorticity in a a. Compressible b. Rotational c. Irrotational a. None of the above 1.5. From the following select the correct statement a. Fluids with contact angle less than 5 st b. Reduction in diameter of a capillary tube will be capillary tube c. Forces between like molecules is called cohesive ses while . called adhesive forces d. All of the above 1.6. The specific weight of the fluid depends upon a. gravitational acceleration b. mass density of the fluid c. center of gravity and line of action of hydrostatic force. d. both a, and be

Answer 1

1.1) more

If the fluid viscosity is high, there will be more stagnant layers of fluid over the solid surface. As a result boundary layer thickness will be more.

1.2) viscosity

Viscosity is the property of a fluid which offers resistance to shear deformation and hence resistance to fluid flow.

1.3) question is not clearly visible

1.4) Irrotational

For an Irrotational flow the net angular velocity in any direction is zero. i.e., there is no vorticity. Therefore, the flow is Irrotational if vorticity is zero.

1.5) All of the above

For a wetting fluid like water the contact angle with the solid surface is less than 90 degrees. This happens because the adhesive forces between solid surface and fluid molecules are greater than the cohesive forces between the fluid molecules.

The wetting fluid rises in the capillary tube if diameter is reduced. This phenomenon is known as capillary action.

Forces between like molecules are known as cohesive forces. Eg: forces between water molecules, forces between Mercury molecules. The forces between unlike molecules are known as adhesive forces. Eg: Forces between Mercury and glass, forces between water and glass.

1.6) both a and b

Specific weight of the fluid=

density× gravitational acceleration