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boiling
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Boiling and condensation
King Saud UniversiyCollege of Engineering
Chemical Engineering DeptmentChE 313 ChE 317Heat Transfer Operations
Boiling
Boiling
Film boiling
Example: Film boiling
Example: Film boiling
Example: Film boiling
Q1Water is being boiled at 1 atm abs pressure in a jacketed kettle with steam condensing in the jacket at 115.6 ºC. The inside diameter of the kettle is 0.656 m and the height is 0.984 m. The bottom is assumed to be flat. Both the bottom and the sides up to a height of 0.656 m are jacketed. The kettle surface for heat transfer is 3.2-mm stainless steal with a k of 16.27 W/m. K. Predict the boiling heat-transfer coefficient for the vertical jacketed sides of the kettle. Also predict the total heat transfer if the boiling heat-transfer coefficient for the bottom surface of the kettle is 2955 W/m2.K.
hsteam =10200W/m2K
King Saud University ChE 313College of Engineering Tutorial # 7Chemical Engineering Dept. 10/5/1431
Heat Transfer Operations
Q2
steam saturated at 68.9 kPa (10 psia) is condensing on a vertical tube 1.22 m (4.0 ft) long having an OD of 0.0254 m (1.0 in.) and a surface temperature of 86.11 ºC (187 ºF). Calculate the average heat-transfer-coefficient using English and SI units.
King Saud University ChE 317College of Engineering Tutorial # 5Chemical Engineering Dept.
Heat Transfer Operations