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Fluid Mechanics

A pipe has a porous section of length L as shown in the figure. Velocity at the start of this section of V0. If fluid leaks into the pipe through the porous section at a volumetric rate per unit area q(x/L)2, what will be axial velocity in the pipe at any x ? Assume incompressible one dimensional flow i.e., no gradients in the radial direction.

CHEMICAL ENGINEERING, Fluid Mechanics /
Question: A pipe has a porous section of length L as shown in the figure. Velocity at the start of this section of V0. If fluid leaks into the pipe through the porous section at a volumetric rate per unit area q(x/L)2, what will be axial velocity in the pipe at any x ? Assume incompressible one dimensional flow i.e., no gradients in the radial direction.
[A].

[B].

[C].

[D].

Answer: Option D

Explanation:

No answer description available for this question.

A pipe has a porous section of length L as shown in the figure. Velocity at the start of this section of V0. If fluid leaks into the pipe through the porous section at a volumetric rate per unit area q(x/L)2, what will be axial velocity in the pipe at any x ? Assume incompressible one dimensional flow i.e., no gradients in the radial direction. Read More »

CHEMICAL ENGINEERING, Fluid Mechanics

A conical tank with a bottom opening of cross-sectional area A is filled with water and is mounted on supports as shown in the figure. What is the force F with which plate X must be pushed up to prevent water from leaking ? Assume that the density of air is negligible as compared to the density of water ρL.

CHEMICAL ENGINEERING, Fluid Mechanics /
Question: A conical tank with a bottom opening of cross-sectional area A is filled with water and is mounted on supports as shown in the figure. What is the force F with which plate X must be pushed up to prevent water from leaking ? Assume that the density of air is negligible as compared to the density of water ρL.
[A].

ρL . Vg

[B].

ρL . A.Hg

[C].

ρL . Vg/2

[D].

ρL .Vg/3

Answer: Option B

Explanation:

No answer description available for this question.

A conical tank with a bottom opening of cross-sectional area A is filled with water and is mounted on supports as shown in the figure. What is the force F with which plate X must be pushed up to prevent water from leaking ? Assume that the density of air is negligible as compared to the density of water ρL. Read More »

CHEMICAL ENGINEERING, Fluid Mechanics

For the manometer set up shown in the figure, the pressure difference PA – PB is given by

CHEMICAL ENGINEERING, Fluid Mechanics /
Question: For the manometer set up shown in the figure, the pressure difference PA – PB is given by
[A].

(ρH – ρair)gH

[B].

(ρH – ρL)gH

[C].

(ρH – ρL) gH + (ρL – ρair) . g(L – H)

[D].

(ρH – ρL) gL + (ρL – ρair)gH

Answer: Option A

Explanation:

No answer description available for this question.

For the manometer set up shown in the figure, the pressure difference PA – PB is given by Read More »

CHEMICAL ENGINEERING, Fluid Mechanics

A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun’s equation for the above fluid-particle system (in SI units) is given below : Δ P/L = 375 x 103 VOM + 10.94 x 106 V2OM (SI units) If water is to be used as the fluidising medium, in actual operation, the above bed has a height = 1 m. What is the porosity of the fluidised bed ?

CHEMICAL ENGINEERING, Fluid Mechanics /
Question: A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun’s equation for the above fluid-particle system (in SI units) is given below : Δ P/L = 375 x 103 VOM + 10.94 x 106 V2OM (SI units) If water is to be used as the fluidising medium, in actual operation, the above bed has a height = 1 m. What is the porosity of the fluidised bed ?
[A].

0.2

[B].

0.5

[C].

0.7

[D].

0.8

Answer: Option C

Explanation:

No answer description available for this question.

A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun’s equation for the above fluid-particle system (in SI units) is given below : Δ P/L = 375 x 103 VOM + 10.94 x 106 V2OM (SI units) If water is to be used as the fluidising medium, in actual operation, the above bed has a height = 1 m. What is the porosity of the fluidised bed ? Read More »

CHEMICAL ENGINEERING, Fluid Mechanics

A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun’s equation for the above fluid-particle system (in SI units) is given below : Δ P/L = 375 x 103 VOM + 10.94 x 106 V2OM (SI units) If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is

CHEMICAL ENGINEERING, Fluid Mechanics /
Question: A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun’s equation for the above fluid-particle system (in SI units) is given below : Δ P/L = 375 x 103 VOM + 10.94 x 106 V2OM (SI units) If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is
[A].

12 mm/s

[B].

16 mm/s

[C].

24 mm/s

[D].

28 mm/s

Answer: Option B

Explanation:

No answer description available for this question.

A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun’s equation for the above fluid-particle system (in SI units) is given below : Δ P/L = 375 x 103 VOM + 10.94 x 106 V2OM (SI units) If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is Read More »

CHEMICAL ENGINEERING, Fluid Mechanics

A fluid element has a velocity V = -y2 . xi + 2yx2 . j. The motion at (x, y) = (l/2, 1) is

CHEMICAL ENGINEERING, Fluid Mechanics /
Question: A fluid element has a velocity V = -y2 . xi + 2yx2 . j. The motion at (x, y) = (l/2, 1) is
[A].

rotational and incompressible

[B].

rotational and compressible

[C].

irrotational and compressible

[D].

irrotational and incompressible

Answer: Option B

Explanation:

No answer description available for this question.

A fluid element has a velocity V = -y2 . xi + 2yx2 . j. The motion at (x, y) = (l/2, 1) is Read More »

CHEMICAL ENGINEERING, Fluid Mechanics

A gas (density = 1.5 kg/m3 , viscosity = 2x 10-5 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5kg/m3and viscosity of 3 x 10-5kg/m.s flowing at 3 m/s will be

CHEMICAL ENGINEERING, Fluid Mechanics /
Question: A gas (density = 1.5 kg/m3 , viscosity = 2x 10-5 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5kg/m3and viscosity of 3 x 10-5kg/m.s flowing at 3 m/s will be
[A].

8400 Pa/m

[B].

12600 Pa/m

[C].

18900 Pa/m

[D].

16800 Pa/m

Answer: Option B

Explanation:

No answer description available for this question.

A gas (density = 1.5 kg/m3 , viscosity = 2x 10-5 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5kg/m3and viscosity of 3 x 10-5kg/m.s flowing at 3 m/s will be Read More »

CHEMICAL ENGINEERING, Fluid Mechanics

For turbulent flow of an incompressible fluid through a pipe, the flow rate Q is proportional to (Δ P)n, where ΔP is the pressure drop. The value of exponent ‘n’ is

CHEMICAL ENGINEERING, Fluid Mechanics /
Question: For turbulent flow of an incompressible fluid through a pipe, the flow rate Q is proportional to (Δ P)n, where ΔP is the pressure drop. The value of exponent ‘n’ is
[A].

1

[B].

0

[C].

< 1

[D].

> 1

Answer: Option C

Explanation:

No answer description available for this question.

For turbulent flow of an incompressible fluid through a pipe, the flow rate Q is proportional to (Δ P)n, where ΔP is the pressure drop. The value of exponent ‘n’ is Read More »

CHEMICAL ENGINEERING, Fluid Mechanics