Consider the following fluids at a film temperature of 300 K in parallel flow over a flat plate with velocity of 1 m/s: atmospheric air, water, engine oil, and mercury. For each fluid, determine the velocity and thermal boundary layer thicknesses, in mm, at a distance of 30 mm from the leading edge. Fluid Air Water i Mercury i Engine Oil i 8 (mm) Mi i MI 8, (mm)

Consider the following fluids at a film temperature of 300 K in parallel flow over a flat plate with velocity of 1 m/s: atmospheric air, water, engine oil, and mercury. For each fluid, determine the velocity and thermal boundary layer thicknesses, in mm, at a distance of 30 mm from the leading edge. Fluid Air Water i Mercury i Engine Oil i 8 (mm) Mi i MI 8, (mm)

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 5.61P

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1.0 Consider the following fluids at a film temperature of 300 K in parallel flow over a flat plate with velocity of 1 m/s: atmospheric air, water, engine oil, and mercury. For each fluid, determine the velocity and thermal boundary layer thicknesses, in mm, at a distance of 20 mm from the leading edge.
Airstream at 1 atm flows, with a velocity of 15 m/s, in parallel over a 3-m-long flat plate where there is an unheated starting length of 1 m. The airstream has a temperature of 20°C and the heated section of the flat plate is maintained at a constant temperature of 80°C. Determine (a) the local convection heat transfer coefficient at the trailing edge and (b) the average convection heat transfer coefficient for the heated section.
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A coated sheet is being dried with hot air blowing in cross flow on the sheet surface. The surface temperature of the sheet is constant at 90°C, while the air velocity and temperature are 0.3 m/s and 110°C, respectively. The length of the sheet subjected to the blowing hot air is 1 m long. Determine the convection heat transfer coefficient and the heat flux added to the sheet surface. Treat the coated sheet as a vertical plate in cross flow.
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.
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Air stream at 1 atm flows with a velocity of 2 m/s, in parallel over a 3 m long square flat plate, placed on ground, where there is an unheated starting length of 1 m. The air stream has a temperature of 20 °C and the heated section of the flat plate is maintained at a constant temperature of 80 °C. Determine the local heat transfer coefficient at trailing edge and average convection heat transfer coefficient for the heated section. Also calculate the heat loss by convection. Determine the average friction coefficient and wall shear stress and drag force.
Air at 60°F flows over a 10-ft-long flat plate at 7 ft/s. Determine the local friction and heat transfer coefficients at intervals of 1 ft, and plot the results against the distance from the leading edge.
Oil flow in a journal bearing can be treated as parallel flow between two large isothermal plates with one plate moving at a constant velocity of 8 m/s and the other stationary. Consider such a flow with a uniform spacing of 0.7 mm between the plates. The temperatures of the upper and lower plates are 40°C and 15°C, respectively. By simplifying and solving the continuity, momentum, and energy equations, determine (a) the velocity and temperature distributions in the oil, (b) the maximum temperature and where it occurs, and (c) the heat flux from the oil to each plate.
Air at 20oC and 1 atm flows over a flat plate at 35 m/s. The plate is 75 cm long and 100 cm depth and is maintained at 60oC. Calculate (a) velocity boundary layer thickness at the leading edge, (b) thermal boundary layer thickness at the distance of 10 cm from the leading edge, and (c) thermal boundary layer thickness at the trailing edge.
Please help with this questionHot carbon dioxide exhaust gas at 1 atm is being cooled by flat plates. Thegas at 220°C flow is parallel over the upper and lower surfaces of a 3-m-longflat plate at a velocity of 3 m/s. If the flat plate surface temperature ismaintained at 80°C.Determine the local convection heat transfer coefficient at 1 m fromthe leading edge and calculate the average convection heat transfer coefficient over theentire plate.
Air is flowing in parallel over the upper surface of a flat plate with a length of 4m. The first half of the plate length, from the leading edge, has a constant surface temperature of 50 degrees Celsius. The second half of the plate length is subjected to a uniform heat flux of 86 W/m2. The air has a free stream velocity and temperature of 2 m/s and 10 degrees Celsius, respectively. Determine the local convection heat transfer coefficients at 1 m and 3 m from the leading edge. Evaluate the air properties at a film temperature of 30 degrees Celsius. Is the film temperature Tf=30 degrees Celsius applicable at x = 3 m?