Numerical's Solution | Fluid Dynamics

2076 B
Eight spherical rain drops of the same mass and radius are falling down with a terminal speed  5\;cm/s. If the coalesce to form one big drop, what will be its terminal speed? [Click here for solution]

2075 S / 2072 D / 2069 A / 2057
Castor oil at 20^{\circ}\;C has a coefficient of viscosity 2.42\;N\,s\, /m^2 and density 940\; kg/m^3. Calculate the terminal velocity of steel ball of radius 2\;mm falling under gravity in the oil, taking density of steel as 7800\;kg/m^3. [Click here for solution]

2075 A
Calculate mass of an aeroplane with the wings of area 55\;m^2 flying horizontally. The velocity of air above and below the wings is 155\;m/s and 140\;m/s respectively. [Click here for solution]

2073 S / 2062
Calculate the magnitude and direction of the terminal velocity of an air bubble of radius 1\;mm passing through an oil viscosity 0.2\;N\,s\, /m^2 and specific gravity 0.9 if the density of air is 1.29\;kg/m^3. [Click here for solution]

2073 D
Eight spherical raindrops of equal size are falling vertically through air with a terminal velocity of 0.15\;m/s. What would be the terminal velocity, if they coalesce to form a big drop? [Click here for solution]

2069 S
Three spherical raindrops of equal size are falling vertically through air with terminal velocity 0.2\;m/s. What would be the terminal velocity if these three drops were to coalesce to form lager spherical drops? [Click here for solution]

2068
Water flows steadly through a horizontal pipe of non-uniform cross section. If the pressure of water is 4 * 10^6\;N/m^2 at a point where the velocity of flow is 2\;m/s and cross section is 0.02\;m^2, what is the pressure at a point where cross-section reduces to 0.01\;m^2? [Click here for solution]

2067
Three spherical raindrops of equal size are falling vertically through air with a terminal velocity of 0.15\;m/s. What would be the terminal velocity if these three drops were to coalesce to form a large spherical drop? [Click here for solution]

2065
Two drops of same liquid of same radius are falling through air with steady velocity of 2\;m/s. If the two drops coalesce what would be the terminal velocity? [Click here for solution]

2061
What is the terminal velocity of a glass ball falling through a tall jar containing glycerine? The densities of the glass ball and glycerine are 2.6\;g/cc and 1.32 \;g/cc respectively and the viscosity of the glycerine is 0.85\;poise and radius of the glass ball is 2\;mm. [Click here for solution]

2059
What is the terminal velocity of a glass ball falling through a tall jar containing glycerine? The densities of the glass ball and glycerine are 8.5\;g/cc and 1.32 \;g/cc respectively and the viscosity of the glycerine is 0.85\;poise and radius of the glass ball is 2\;mm. [Click here for solution]

2050
With what the terminal velocity will an air bubble 1\;mm in diameter rise in a liquid of viscosity 150\;poise and density 0.9\;g/cm^3? [Click here for solution]


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