The average mass transfer convection co-efficient h ¯ for the evaporation process.

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Answer 1

Question

Chapter 6, Problem 6.83P

(a)

To determine

The average mass transfer convection co-efficient h¯ for the evaporation process.

(b)

To determine

The average heat transfer convection coefficient.

(c)

To determine

Whether the values of h¯m and h¯ satisfy the heat mass analogy or not.

(d)

To determine

Whether the evaporation rate and disk temperature increase or decreases if the relative humidity of ambient air at 295 K were increased from 0 to 0.5

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In a falling-film evaporator, Air at 40℃ and 50 kPa flows through a wetted-wall column with 100 mm diameter at a velocity of 5 m/s. What is the mass-transfer coefficient for the humidification of this stream by evaporation from the wet walls? If the air in this situation is 50 % saturated, and the saturation particle pressure of water vapour at 40℃ is 7375 Pa, what is the local evaporation flux in a unit of kg/m²s?

Air at 25°C and atmospheric pressure flows with a velocity of 3 m/s inside a 10mm diameter tube of 1 m length. The inside surface of the tube contains a deposit of naphthalene. Determine the average mass transfer coefficient for the transfer of naphthalene from the pipe surface into the air.

Air at 20°C and 1 atm flows through a cylindrical tube made of naphthalene at a velocity of 5 m/s. The diameter of the tube is 0.1 m. Using the correlations, calculate the mass transfer coefficient for this setup. Then, compare this result with the mass transfer coefficient from the Reynolds Analogy, Prandtl Analogy, Von Karman Analogy, and Chilton-Colburn Analogy. The effectivity diffusivity is 4.24 x 10-6 m2/s.

Answer 2

Question

Chapter 6, Problem 6.83P

(a)

To determine

The average mass transfer convection co-efficient h¯ for the evaporation process.

(b)

To determine

The average heat transfer convection coefficient.

(c)

To determine

Whether the values of h¯m and h¯ satisfy the heat mass analogy or not.

(d)

To determine

Whether the evaporation rate and disk temperature increase or decreases if the relative humidity of ambient air at 295 K were increased from 0 to 0.5

Expert Solution & Answer

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Check out a sample textbook solution

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Answer 3

Question

Chapter 6, Problem 6.83P

(a)

To determine

The average mass transfer convection co-efficient h¯ for the evaporation process.

(b)

To determine

The average heat transfer convection coefficient.

(c)

To determine

Whether the values of h¯m and h¯ satisfy the heat mass analogy or not.

(d)

To determine

Whether the evaporation rate and disk temperature increase or decreases if the relative humidity of ambient air at 295 K were increased from 0 to 0.5

Expert Solution & Answer

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Check out a sample textbook solution

See solution

Answer 4

Question

Chapter 6, Problem 6.83P

(a)

To determine

The average mass transfer convection co-efficient h¯ for the evaporation process.

(b)

To determine

The average heat transfer convection coefficient.

(c)

To determine

Whether the values of h¯m and h¯ satisfy the heat mass analogy or not.

(d)

To determine

Whether the evaporation rate and disk temperature increase or decreases if the relative humidity of ambient air at 295 K were increased from 0 to 0.5

Expert Solution & Answer

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Check out a sample textbook solution

See solution

Answer 5

Chapter 6, Problem 6.83P

(a)

To determine

The average mass transfer convection co-efficient h¯ for the evaporation process.

(b)

To determine

The average heat transfer convection coefficient.

(c)

To determine

Whether the values of h¯m and h¯ satisfy the heat mass analogy or not.

(d)

To determine

Whether the evaporation rate and disk temperature increase or decreases if the relative humidity of ambient air at 295 K were increased from 0 to 0.5

Answer 6

Chapter 6, Problem 6.83P

(a)

To determine

The average mass transfer convection co-efficient h¯ for the evaporation process.

Answer 7

Chapter 6, Problem 6.83P

(a)

To determine

The average mass transfer convection co-efficient h¯ for the evaporation process.

Answer 8

(b)

To determine

The average heat transfer convection coefficient.

Answer 9

(b)

To determine

The average heat transfer convection coefficient.

Answer 10

(c)

To determine

Whether the values of h¯m and h¯ satisfy the heat mass analogy or not.

Answer 11

(c)

To determine

Whether the values of h¯m and h¯ satisfy the heat mass analogy or not.

Answer 12

(d)

To determine

Whether the evaporation rate and disk temperature increase or decreases if the relative humidity of ambient air at 295 K were increased from 0 to 0.5

Answer 13

(d)

To determine

Whether the evaporation rate and disk temperature increase or decreases if the relative humidity of ambient air at 295 K were increased from 0 to 0.5

Answer 14

Expert Solution & Answer

Answer 15

Expert Solution & Answer

Answer 16

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Answer 17

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The average mass transfer convection co-efficient h ¯ for the evaporation process.

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The average mass transfer convection co-efficient h¯ for the evaporation process.

The average heat transfer convection coefficient.

Whether the values of h¯m and h¯ satisfy the heat mass analogy or not.

Whether the evaporation rate and disk temperature increase or decreases if the relative humidity of ambient air at 295 K were increased from 0 to 0.5

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