25 - 11/1/2010 1 Free Convection: Enclosures Boiling: Modes...

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Unformatted text preview: 11/1/2010 1 Free Convection: Enclosures Boiling: Modes Chapter 9,10 KNOWN: Volume, thermophysical properties, and initial and final temperatures of a pharmaceutical. Diameter and length of submerged tubing. Pressure of saturated steam flowing through the tubing. A building window pane that is 1.2m high and 0.8 m wide is separated from the ambient air by a storm window of the same height and width. The air space between the two windows is 0.06 m thick. If the building and storm windows are at 20oC and -10oC respectively, what is the rate of heat loss by free convection across the air space? What type of geometry is this? a) Vertical plate b) Parallel plate channel c) Vertical cavity d) Horizontal cavity Plan: Look up properties at 5 o C Calculate Ra Calculate H/L State governing equation Choose appropriate correlation Calculate h Calculate q What length do you use for Ra? a) 0.06 b) 0.8 c) 1.2 11/1/2010 2 Boiling Chapter 10 Sections 10.1 through 10.5 General Considerations Boiling is associated with...
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This note was uploaded on 11/17/2010 for the course CHEN 3210 at Colorado.

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25 - 11/1/2010 1 Free Convection: Enclosures Boiling: Modes...

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