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Air enters a rectangular duct measuring 30 cm by 40 cm with a velocity of 8.5 m/s and a temperature of 40 degree Celsius. The flowing air has a thermal conductivity 0.028 W/m K, kinematic viscosity 16.95 * 10 -6 m2/s and from empirical correlations the Nusselt number has been approximated to be 425. Find out the flow Reynolds number
  • a)
    1.1719 * 10 6
  • b)
    2.1719 * 10 6
  • c)
    0.1719 * 10 6
  • d)
    4.1719 * 10 6
Correct answer is option 'C'. Can you explain this answer?
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Air enters a rectangular duct measuring 30 cm by 40 cm with a velocity...
e = V d e/v.
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Air enters a rectangular duct measuring 30 cm by 40 cm with a velocity...
Calculation of Flow Reynolds Number

Given:
- Dimensions of rectangular duct: 30 cm x 40 cm
- Velocity of air: 8.5 m/s
- Temperature of air: 40°C
- Thermal conductivity of air: 0.028 W/m K
- Kinematic viscosity of air: 16.95 x 10^-6 m2/s
- Nusselt number: 425

Step 1: Convert dimensions of duct from cm to m
- Length of duct (L) = 0.4 m
- Width of duct (W) = 0.3 m

Step 2: Calculate Reynolds number using the formula
- Reynolds number (Re) = (density x velocity x length) / viscosity
- Density of air at 40°C = 1.127 kg/m3
- Re = (1.127 x 8.5 x 0.4) / 16.95 x 10^-6
- Re = 0.1719 x 10^6

Step 3: Select the correct option from the given choices
- Option C: 0.1719 x 10^6

Therefore, the correct answer is option C.
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Air enters a rectangular duct measuring 30 cm by 40 cm with a velocity of 8.5 m/s and a temperature of 40 degree Celsius. The flowing air has a thermal conductivity 0.028 W/m K, kinematic viscosity 16.95 * 10-6m2/s and from empirical correlations the Nusselt number has been approximated to be 425. Find out the flow Reynolds numbera)1.1719 * 106b)2.1719 * 106c)0.1719 * 106d)4.1719 * 106Correct answer is option 'C'. Can you explain this answer?
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Air enters a rectangular duct measuring 30 cm by 40 cm with a velocity of 8.5 m/s and a temperature of 40 degree Celsius. The flowing air has a thermal conductivity 0.028 W/m K, kinematic viscosity 16.95 * 10-6m2/s and from empirical correlations the Nusselt number has been approximated to be 425. Find out the flow Reynolds numbera)1.1719 * 106b)2.1719 * 106c)0.1719 * 106d)4.1719 * 106Correct answer is option 'C'. Can you explain this answer? for Chemical Engineering 2024 is part of Chemical Engineering preparation. The Question and answers have been prepared according to the Chemical Engineering exam syllabus. Information about Air enters a rectangular duct measuring 30 cm by 40 cm with a velocity of 8.5 m/s and a temperature of 40 degree Celsius. The flowing air has a thermal conductivity 0.028 W/m K, kinematic viscosity 16.95 * 10-6m2/s and from empirical correlations the Nusselt number has been approximated to be 425. Find out the flow Reynolds numbera)1.1719 * 106b)2.1719 * 106c)0.1719 * 106d)4.1719 * 106Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Chemical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Air enters a rectangular duct measuring 30 cm by 40 cm with a velocity of 8.5 m/s and a temperature of 40 degree Celsius. The flowing air has a thermal conductivity 0.028 W/m K, kinematic viscosity 16.95 * 10-6m2/s and from empirical correlations the Nusselt number has been approximated to be 425. Find out the flow Reynolds numbera)1.1719 * 106b)2.1719 * 106c)0.1719 * 106d)4.1719 * 106Correct answer is option 'C'. Can you explain this answer?.
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