Solve it ASAP Step 4X Your answer is incorrect.What is the free convection heat transfer coefficient on the top of the duct, in W/m2-K?i5.931W/m2.KSave for LaterAttempts: unlimitedSubmit AnswerStep 5X Your answer is incorrect.What is the free convection heat transfer coefficient on the bottom of the duct, in W/m2-K?hy =i2.868W/m2-KSave for LaterAttempts: unlimitedSubmit Answer Airflow through a long, 0.15-m-square air conditioning duct maintains the outer duct surface temperature at 10°C. If the horizontalduct is uninsulated and exposed to air at 35°C in the crawlspace beneath a home, what is the heat gain per unit length of the duct?Evaluate the properties of air at Tf = 300 K. For the sides of the duct, use the more accurate Churchill and Chu correlations forlaminar flow on vertical plates.

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Step 4 X Your answer is incorrect. What is the free convection heat transfer coefficient on the top of the duct, in W/m²-K? Th, = i 5.931 W/m?-K Save for Later Attempts: unlimited Submit Answer Step 5 X Your answer is incorrect. What is the free convection heat transfer coefficient on the bottom of the duct, in W/m2-K? Thy = i 2.868 W/m2-K

Step 4 X Your answer is incorrect. What is the free convection heat transfer coefficient on the top of the duct, in W/m²-K? Th, = i 5.931 W/m?-K Save for Later Attempts: unlimited Submit Answer Step 5 X Your answer is incorrect. What is the free convection heat transfer coefficient on the bottom of the duct, in W/m2-K? Thy = i 2.868 W/m2-K

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.

Chapter5: Analysis Of Convection Heat Transfer

Section: Chapter Questions

Problem 5.7P: 5.7 The average Reynolds number for air passing in turbulent flow over a 2-m-long, flat plate is ....

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5.7 The average Reynolds number for air passing in turbulent flow over a 2-m-long, flat plate is . Under these conditions, the average Nusselt number was found to be equal to 4150. Determine the average heat transfer coefficient for an oil having thermal properties similar to those in Appendix 2, Table 18, at at the same Reynolds number and flowing over the same plate.
5.43 A refrigeration truck is traveling at 130 km/h on a desert highway where the air temperature is . The body of the truck is idealized as a rectangular box 3 m wide, 2.1 m high, and 6 m long, at a surface temperature . Assume that (1) the heat transfer from the front and back of the truck is neglected, (2) the stream does not separate from the surface, and (3) the boundary layer is turbulent over the whole surface. Calculate the required cooling rate of the refrigeration unit.
Water at 1500 kg/h and 10°C enters a 10-mmdiameter smooth tube whose wall temperature is maintained at 49°C. Calculate (a) the tube length necessary to heat the water to 40°C, and (b) the water outlet temperature if the tube length is doubled. Assume average water properties to be the same as in (a).
FUNDAMENTALS OF CONVECTION Consider a flat plate positioned inside a wind tunnel, and air at 1 atm and 20°C is flowing with a free stream velocity of 60 m/s. What is the minimum length of the plate necessary for the Reynolds number to reach 2x107? If the critical Reynolds number is 5x105, what type of flow regime would the airflow experience at 0.2 m from the leading edge? Please, I need the solution from fundamental concepts of how the heat flow behaves in the system. That it be answered with theory of the subject
150 L/s of hot air at 80 degrees Ceelsius enters an 8m long uninsulated square duct of cross-section 20 cm x 20 cm and leaves at 70 degree Celsius. The outer surface temperature of duct is observed to be constant. Use Colburn Equation.
Laminar thermal boundary layer and associated temperature distribution related to flow on a flat plate at constant temperature are given below. The temperature distribution given shows the values at x = x. Free flow Isl sinur layer a) Does the fluid heat the plate? Is it cooling?
Consider a flat plate placed inside a wind tunnel, and air at 1 ATM and 20°C is flowing with a free flow velocity of 60 m/s. What is the minimum length of the plate needed for the Reynolds number to reach 2 × 107? If the critical Reynolds number for external flow is 5 × 105, what type of flow regime would the airflow experience at 0.2 m from the leading edge? I need the solution from fundamental concepts of how the heat flow behaves in the system
For safety reasons, parts can be directly blown by air. with dimensions of 15 cmx20 cm, which are not allowed to contact printed circuit board, 20 cm long 0.2 opened inside Cold air from a rectangular hole of cmx14 cm will be cooled. from electronic parts The heat generated is transmitted from the thin layer of the card to the duct, where it is combined with the air entering the duct at a temperature of 15 °C. is removed. The heat flux on the upper surface of the channel can be considered uniform and The heat transfer from the surfaces can be neglected. If the velocity of the air in the duct does not exceed (590) m/min and the surface temperature of the duct is constant at 50 °C, this circuit board can be safely placed on it. Calculate the maximum total power of the electronic parts to be placed.
The air at 1 ATM and 35⁰c flow through a cylinder 5 cm in diameter, at Velocity 50 cm/s. The surface temperature of the cylinder is guarded at 150⁰c. *)Count the heat Each cylinder length.
Air at atmospheric pressure and a temperature of 25 degrees C is in parallel flow at a velocity of 5 m/s over a 1-m-long flat plate that is heated from below with a uniform heat flux of 1250 W/m2 . Assume the flow is fully turbulent over the length of the plate. Take ν = 18.76 × 10−6 m2/s, k = 0.0284 W/m·K and Pr =0.703. (a) Calculate the plate surface temperature, Ts(L), and the local convection coefficient, hx(L), at the trailing edge, x = L. (b) Calculate the average temperature of the plate surface.
Thermal energy generated by the electrical resistance of a 5-mm-diameter and 4-m- long bare cable is dissipated to the surrounding air at 80°C. The voltage drop and the electric current across the cable in steady operation are measured to be 18 V and 5 A, respectively. Disregarding radiation, estimate the surface temperature of the cable. Evaluate air properties at a film temperature of 100°C and 1 atm pressure.
Example 1: Engine oil at 60°C flows over the upper surface of a 5-m-long flat plate whose temperature is 20°C with a velocity of 2 m/s (Figure). Determine the total drag force and the rate of heat transfer per unit width of the entire plate.