Castor oil at 36 °C flows over a 6 m long and 1 m wide heated plate at 0.06 m/s. For a surface temperature of 96 °C, determine (i) the thermal boundary layer thickness at the end of the plate, (ii) the local heat transfer coefficient at the end of the plate, and (iii) the rate of heat transfer from the entire plate

Castor oil at 36 °C flows over a 6 m long and 1 m wide heated plate at 0.06 m/s. For a surface temperature of 96 °C, determine (i) the thermal boundary layer thickness at the end of the plate, (ii) the local heat transfer coefficient at the end of the plate, and (iii) the rate of heat transfer from the entire plate

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.
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Consider a 50-cm-diameter and 95-cm-long hot water tank. The tank is placed on the roof ofa house. The water inside the tank is heated to 80℃ by a flat-plate solar collector during theday. The tank is then exposed to windy air at 18℃ with an average velocity of 40 km/h duringthe night. Estimate the temperature of the tank after a 45-min period. Assume the tank surfaceto be at the same temperature as the water inside, and the heat transfer coefficient on the topand bottom surfaces to be the same as that on the side surface. Evaluate the air properties at50℃. (Answer: 69.9 ℃)
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