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class 25 - Free Convection Enclosures Boiling Click to edit...

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Click to edit Master subtitle style 8/13/11 Free Convection: Enclosures Boiling: Chapter 9,10
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8/13/11 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
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8/13/11 Plan: Look up properties at 5oC Calculate Ra Calculate H/L State governing equation Choose appropriate correlation Calculate h Calculate q
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8/13/11 What length do you use for Ra? a) 0.06 b) 0.8 c) 1.2
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8/13/11
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8/13/11
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Click to edit Master subtitle style 8/13/11 Boiling Chapter 10 Sections 10.1 through 10.5
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8/13/11 General Considerations
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