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Unformatted text preview: 10/25/2010 1 Free Convection: Horizontal Plates and Other Geometries Chapter 9 An electrical heater in the form of a horizontal disk of 400mm diameter is used to heat the bottom of a tank filled with engine oil at a temperature of 5 o C. Find the power required to maintain the heater surface at 70 o C. What situation would this be considered? a) Upper surface of hot plate b) Lower surface of cold plate c) Lower surface of hot plate d) Upper surface of cold plate An electrical heater in the form of a horizontal disk of 400mm diameter is used to heat the bottom of a tank filled with engine oil at a temperature of 5 o C. Find the power required to maintain the heater surface at 70 o C. Plan: a) State governing equations(s) b) Look up properties c) Calculate characteristic length d) Find Rayleigh number e) Find appropriate correlation f) Find h, then q An electrical heater in the form of a horizontal disk of 400mm diameter is used to heat the bottom of a tank filled with engine oil at a temperature of 5 o C. Find the power required to maintain the heater surface at 70 o C. 10/25/2010 2 An electrical heater in the form of a horizontal disk of 400mm diameter is used to heat the bottom of a tank filled with engine oil at a temperature of 5 o C. Find the power required to maintain the heater surface at...
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 '10
 DEGRAZIA
 Convection, Heat Transfer, 0.06 M, Nusselt number, Rayleigh number

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