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Air flows in a pipe under fully developed conditions with an average velocity of 1.25 m/s and a temperature of 24°C. The pipe's inner diameter is 4 cm, and its length is 4 m. The first half of the pipe is kept at a constant wall temperature of 100°C. The second half of the pipe is subjected to a constant heat flux of 200 W. The properties of air at 80°C are p = 0.9994 kg/m³, k = 0.02953 W/m-K, v= 2.097 × 10-5 m²/s, Cp=1008 J/kg-K, and Pr = 0.7154. 2m Air 1.25 m/s T₁ = 100°C D=4 cm 2m O, = 200 W Determine the air temperature at the 2 m length. The air temperature at the 2 m length is °C.

Air flows in a pipe under fully developed conditions with an average velocity of 1.25 m/s and a temperature of 24°C. The pipe's inner diameter is 4 cm, and its length is 4 m. The first half of the pipe is kept at a constant wall temperature of 100°C. The second half of the pipe is subjected to a constant heat flux of 200 W. The properties of air at 80°C are p = 0.9994 kg/m³, k = 0.02953 W/m-K, v= 2.097 × 10-5 m²/s, Cp=1008 J/kg-K, and Pr = 0.7154. 2m Air 1.25 m/s T₁ = 100°C D=4 cm 2m O, = 200 W Determine the air temperature at the 2 m length. The air temperature at the 2 m length is °C.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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Air flows in a pipe under fully developed conditions with an average velocity of 1.25 m/s and a temperature of 24°C. The pipe's inner diameter is 4 cm, and its length is 4 m. The first half of the pipe is kept at a constant wall temperature of 100°C. The second half of the pipe is subjected to a constant heat flux of 200 W. The properties of air at 80°C are p = 0.9994 kg/m³, k = 0.02953 W/m-K, v= 2.097 × 10-5 m²/s, Cp = 1008 J/kg-K, and Pr=0.7154. Air 1.25 m/s 2m T₁ = 100°C D = 4 cm 2m ė, = 200 W Determine the air temperature at the 2 m length. The air temperature at the 2 m length is °C.
Transcribed Image Text:Air flows in a pipe under fully developed conditions with an average velocity of 1.25 m/s and a temperature of 24°C. The pipe's inner diameter is 4 cm, and its length is 4 m. The first half of the pipe is kept at a constant wall temperature of 100°C. The second half of the pipe is subjected to a constant heat flux of 200 W. The properties of air at 80°C are p = 0.9994 kg/m³, k = 0.02953 W/m-K, v= 2.097 × 10-5 m²/s, Cp = 1008 J/kg-K, and Pr=0.7154. Air 1.25 m/s 2m T₁ = 100°C D = 4 cm 2m ė, = 200 W Determine the air temperature at the 2 m length. The air temperature at the 2 m length is °C.
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It says the answer is NOT 33.7 oC (see attached photo). What is the correct answer? Thank you.

## Required Information Air flows in a pipe under fully developed conditions with an average velocity of 1.25 m/s and a temperature of 24°C. The pipe’s inner diameter is 4 cm, and its length is 4 m. The first half of the pipe is kept at a constant wall temperature of 100°C. The second half of the pipe is subjected to a constant heat flux of 200 W. The properties of air at 80°C are: - Density (ρ) = 0.9994 kg/m³ - Thermal Conductivity (k) = 0.02953 W/m·K - Kinematic Viscosity (ν) = 2.097 × 10⁻⁵ m²/s - Specific Heat (cₚ) = 1008 J/kg·K - Prandtl Number (Pr) = 0.7154 **Note:** This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. ### Diagram Explanation The diagram shows a horizontal pipe with air entering from the left at 1.25 m/s. The pipe is 4 m long, with the first 2 m having a constant wall temperature (Tₛ) of 100°C, and the second 2 m subjected to a constant heat flux (Q̇) of 200 W. The inner diameter (D) of the pipe is 4 cm. ### Question Determine the air temperature at the 2 m length. #### Answer Submitted The air temperature at the 2 m length is **33.7°C**, but this answer is marked incorrect.
Transcribed Image Text:## Required Information Air flows in a pipe under fully developed conditions with an average velocity of 1.25 m/s and a temperature of 24°C. The pipe’s inner diameter is 4 cm, and its length is 4 m. The first half of the pipe is kept at a constant wall temperature of 100°C. The second half of the pipe is subjected to a constant heat flux of 200 W. The properties of air at 80°C are: - Density (ρ) = 0.9994 kg/m³ - Thermal Conductivity (k) = 0.02953 W/m·K - Kinematic Viscosity (ν) = 2.097 × 10⁻⁵ m²/s - Specific Heat (cₚ) = 1008 J/kg·K - Prandtl Number (Pr) = 0.7154 **Note:** This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. ### Diagram Explanation The diagram shows a horizontal pipe with air entering from the left at 1.25 m/s. The pipe is 4 m long, with the first 2 m having a constant wall temperature (Tₛ) of 100°C, and the second 2 m subjected to a constant heat flux (Q̇) of 200 W. The inner diameter (D) of the pipe is 4 cm. ### Question Determine the air temperature at the 2 m length. #### Answer Submitted The air temperature at the 2 m length is **33.7°C**, but this answer is marked incorrect.
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