Chapter 13 – Fluid Mechanics

The surface tension and vapour pressure of water at 30oC is 7.2×10^−2Nm^−1 and 2.4×10^3 Pa respectively What is the radius of the smallest droplet of water which can be formed without evaporating at 30 degree C ? A rectangular film of liquid is extended from (4cm×2cm) to (5cm×4cm). If the work done is 3 x [...]

The surface tension of soap solution at a temperature 20∘C is 2.5×10^−2Nm^−1.The excess pressure inside a bubble of soap solution of radius 6 mm is The surface tension of soap solution at a temperature 20∘C is 2.5×10^−2Nm^−1.The excess pressure inside a bubble of soap solution of radius 6 mm is September 20, 2020 Category: Chapter [...]

Under a pressure head, the rate of flow of orderly volume flow of liquid through a capillary tube is V, if the length of the capillary is doubled and the diameter of the bore is halved, the rate of flow would become if the length of the capillary is doubled and the diameter of the [...]

A drop of water detaches itself from the exit of a tap when (σ= surface tension of water. ρ= density of water, R= radius of the tap exit, r= radius of the drop) A drop of water detaches itself from the exit of a tap when (σ= surface tension of water. ρ= density of water [...]

1000 droplets of water having 2mm diameter each coalesce to form a single drop. Given the surface tension water is 0.72 Nm^−1. The energy loss in the process is 1000 droplets of water having 2mm diameter each coalesce to form a single drop. Given the surface tension water is 0.72 Nm^−1. The energy loss in [...]

Three liquids of densities p1,p2 and p3 (with p1>p2>p3 ) having the same value of surface tension T, rise to the same height in three identical capillaries The angles of contact θ1,θ2 and θ3 obey:- p2 and p3 (with p1>p2>p3 ) having the same value of surface tension T rise to the same height in [...]

A rectangular film of liquid is extended from (4cm×2cm) to (5cm×4cm). If the work done is 3 x 10^{-4}J, the value of the surface tension of the liquid is A rectangular film of liquid is extended from (4cm×2cm) to (5cm×4cm). If the work done is 3 x 10^{-4}J the value of the surface tension of [...]

A liquid drop having surface energy ‘E’ is spread into 512 droplets of same size. The final surface energy of the droplets is A liquid drop having surface energy 'E' is spread into 512 droplets of same size. The final surface energy of the droplets is September 20, 2020 Category: Chapter 13 - Fluid Mechanics [...]

In a capillary tube of radius ‘R’, a straight thin metal wire of radius ‘r’ (R > r) is inserted symmetrically and one end of the combination is dipped vertically in water such that the lower end of the combination is at same level. The rise of water in the capillary tube is [T = [...]

If T is the surface tension of the liquid, the change in surface energy by splitting a liquid drop of radius R into 125 droplets of radius r is If T is the surface tension of the liquid the change in surface energy by splitting a liquid drop of radius R into 125 droplets of [...]