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Problems: Heat Transfer in Boiling & Condensation | Heat Transfer - Mechanical Engineering PDF Download

Frequently Asked Questions and Problems for Practice (Module 6)

Q.1

What is Leidenfrost phenomenon?

Q.2

How the presence of non-condensable gases affect the condensation rate of vapour?

Q.3

What is the difference between drop-wise and film condensation?

Q.4

Discuss the phenomena of condensation on a vertical and a horizontal plate.

Q.5

Saturated vapour of methanol condenses on a vertical plate at 1 atm. The vertical plate is maintained at 55 oC by cooling water at the other side. Calculate the following,
(a) Length of the plate over which the condensate film remains laminar.
(b) What is the thickness of the film at the end of the laminar region?
(c) Determine the average heat transfer coefficient and the rate of condensation in the laminar region.
(c) What is the average heat transfer coefficient for the entire plate?

Q.6.

Saturated steam flows in a horizontal tube having 5 cm diameter and 15 cm of length. Calculate the condensation for a tube wall temperature of 96 oC.

Q.7.

An uninsulated water pipe carrying water at 2 oC passes through hot and humid area where the temperature is 32 oC and the relative humidity is 75%. Estimate the condensate if the pipe is 50 mm in diameter and the exposed length is 75 cm. It may be assumed that the pipe is exposed to saturated vapour at the partial pressure of the water vapour in the air.

Q.8.

Compare the heat transfer coefficients for boiling water and condensing steam on a horizontal tube for normal atmospheric conditions.

The document Problems: Heat Transfer in Boiling & Condensation | Heat Transfer - Mechanical Engineering is a part of the Mechanical Engineering Course Heat Transfer.
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FAQs on Problems: Heat Transfer in Boiling & Condensation - Heat Transfer - Mechanical Engineering

1. What is heat transfer in boiling and condensation?
Ans. Heat transfer in boiling and condensation refers to the transfer of thermal energy during the phase change of a substance from a liquid to a vapor (boiling) or from a vapor to a liquid (condensation). This process involves the exchange of heat between the substance and its surroundings.
2. How does boiling occur?
Ans. Boiling occurs when the temperature of a liquid reaches its boiling point, which is the temperature at which the vapor pressure of the liquid equals the pressure exerted on the liquid. As heat is applied to the liquid, the molecules gain energy and start to move more rapidly. This increased molecular motion leads to the formation of bubbles within the liquid, resulting in boiling.
3. What factors affect the rate of boiling?
Ans. Several factors affect the rate of boiling. These include the heat input rate, the temperature difference between the liquid and its surroundings, the surface area available for boiling, and the presence of impurities or dissolved gases in the liquid. Additionally, the boiling point of a liquid is influenced by the pressure exerted on the liquid.
4. How does condensation occur?
Ans. Condensation occurs when a vapor comes into contact with a surface at a temperature below its dew point. When the vapor molecules come into contact with the cooler surface, they lose energy and transition from a gaseous state to a liquid state. This process releases heat, which is transferred to the surface.
5. What are the applications of heat transfer in boiling and condensation?
Ans. Heat transfer in boiling and condensation has numerous applications in various industries. It is utilized in the design and operation of heat exchangers, distillation columns, refrigeration systems, and power plants. Boiling and condensation processes are commonly used for heat removal, energy conversion, and separation processes in chemical engineering.
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