Chapter 10 Boiling and Condensation10-84 Saturated steam at a saturation temperature of Tsat= 95°C (Table A-9) condenses on a canned drink at 5°C in a dropwise manner. The heat transfer coefficient for this dropwise condensation is to be determined.AssumptionsThe heat transfer coefficient relation for dropwise condensation that was developed for copper surfaces is also applicable for aluminum surfaces. AnalysisNoting that the saturation temperature is less than 100°C, the heat transfer coefficient for dropwise condensation can be determined from Griffith’s relation to be hhT==+=+×=⋅dropwisesat511042044204495,,245,284 W / mC2°Steam95°C Drink 5°C 10-85Water is boiled at 1 atm pressure and thus at a saturation temperature of Tsat= 100°C by a nickel electric heater whose diameter is 2 mm. The highest temperature at which this heater can operate without burnout is to be determined.Assumptions1Steady operating conditions exist. 2Heat losses from the water are negligible.
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This note was uploaded on 01/24/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.