Question: Free convection velocity. (a) Verify the expression for the average velocity in the upward-moving stream in Eq. 10.9-16. (b) Evaluate for the conditions given

Free convection velocity.

(a) Verify the expression for the average velocity in the upward-moving stream in Eq. 10.9-16.

(b) Evaluate β for the conditions given below.

(c) What is the average velocity in the upward-moving stream in the system described in Fig. 10.9-1 for air flowing under these conditions?

Pressure 1atm

Temperature of the heated wall 100°c

Temperature of the cooled wall 20°C

Spacing between the walls 0.6 cm

Surface temperatures of plastic panel -T2 = 61°F - T¡ = 69°F T3 = 0°F- Wall - Plastic panel has thermal conductivity

Surface temperatures of plastic panel -T2 = 61F - T = 69F T3 = 0F- Wall - Plastic panel has thermal conductivity k = 0.075 Btu/hr ft F (average value between T1 and T2) 6"- 0.502"

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