A moist cement omnes diameter 10 ohm circular cross-section will be dried using air in a tray and, for example, the variation of moisture content over time will be examined. The heat transfer coefficient was calculated as 0.68 cal/min.cm³.C in the fixed still drying arab. Dry and wet chamber temperatures of the air used for drying are 35 and 20°C, respectively. For example, calculate the mass transfer coefficient during the 10-minute constant speed drying interval. (Note: the humidity of the air (Ha) should be calculated with the humidity diagram.)

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Chapter6: Forced Convection Over Exterior Surfaces
Section: Chapter Questions
Problem 6.28P
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A moist cement omnes diameter 10 ohm
circular cross-section will be dried using air
in a tray and, for example, the variation of
moisture content over time will be examined.
The heat transfer coefficient was calculated as
0.68 cal/min.cm³.C in the fixed still drying arab.
Dry and wet chamber temperatures of the air
used for drying are 35 and 20°C, respectively.
For example, calculate the mass transfer
coefficient during the 10-minute constant speed
drying interval. (Note: the humidity of the air
(Ha) should be calculated with the humidity
diagram.)
Data
Evaporation enthalpy of water: 2454.2 kj/kg at
20°C 2418.6 k/kg at 35C Vapor pressure of water:
17.54 mm Hg at 20°C. 35C is 42.18 mm Hg.
Transcribed Image Text:A moist cement omnes diameter 10 ohm circular cross-section will be dried using air in a tray and, for example, the variation of moisture content over time will be examined. The heat transfer coefficient was calculated as 0.68 cal/min.cm³.C in the fixed still drying arab. Dry and wet chamber temperatures of the air used for drying are 35 and 20°C, respectively. For example, calculate the mass transfer coefficient during the 10-minute constant speed drying interval. (Note: the humidity of the air (Ha) should be calculated with the humidity diagram.) Data Evaporation enthalpy of water: 2454.2 kj/kg at 20°C 2418.6 k/kg at 35C Vapor pressure of water: 17.54 mm Hg at 20°C. 35C is 42.18 mm Hg.
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