Question

Problem 8.1 Saturated water is heated in a pot (cylindrical container) made out of 2 mm thick stainless steel 304. The pressure in the kitchen is 1 atm. The temperature of the heated bottom (20 cm diameter disk) is Tdisk Calculate the heat flux for Tdisk-| 01 C, 103 C, 105 C, I 10 C, I 20 C 150 C. Find the point of interception between natural convection and boiling. Plot a the log q vs. log dT a) b) c)

Answer 1

Tsat L) fA- 0 03145. 62. o-o 5 62 45 5 22- Ιστ) 10.0314/ 02-5 | 3512. 0 5 20 Scanned with CamScanner CSI

In(q) In h (w/m2 C 5.62 151.74 702.5 5620 44960 702500 w/m2 Tsat 100 100 100 100 100 100 1.726331664 5.62 455.22 3512.5 56200 899200 35125000 0.0314 0.0314 0.0314 0.0314 0.0314 0.0314 1.098612289 6.120780819 1.609437912 8.164083314 10.93667204 13.70926076 101 103 105 110 120 150 1.609437912 2.302585093 10 2.995732274 13.70926076 17.37442369 20 3.912023005 dT Vs. q dT Vs. In(q) 20 dT 4 10000000 20000000 30000000 40000000 10000000 4