processing plant is convectively heating a solid half-sphere of radius of 12 cm made of pure aluminum (k 237 W/m-K) by placing it on an nsulated surface as shown in Fig. 1. It is exposed to hot exhaust gas at 300°C with a convection coefficient of 180 W/m²-K. Is the lumped capacitance approximation valid? Figure 1: Half-sphere f the plant wants to heat the half-sphere of the previous problem keeping t on an insulated surface as shown in Fig. 2, what is the maximum possible convection coefficient allowed to keep the temperature of the half-sphere uniform during the heating process? Figure 2: Inverted half-sphere
processing plant is convectively heating a solid half-sphere of radius of 12 cm made of pure aluminum (k 237 W/m-K) by placing it on an nsulated surface as shown in Fig. 1. It is exposed to hot exhaust gas at 300°C with a convection coefficient of 180 W/m²-K. Is the lumped capacitance approximation valid? Figure 1: Half-sphere f the plant wants to heat the half-sphere of the previous problem keeping t on an insulated surface as shown in Fig. 2, what is the maximum possible convection coefficient allowed to keep the temperature of the half-sphere uniform during the heating process? Figure 2: Inverted half-sphere
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter3: Transient Heat Conduction
Section: Chapter Questions
Problem 3.23P
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Answer the problem "If the plant wants to heat the half-sphere of the previous problem keeping
it on an insulated surface as shown in Fig. 2..." (use the other problem as reference)
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