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 5 mm from the leading edge. Fluid 8 (mm) 8, (mm) Air Water i Engine Oil Mercury

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 5 mm from the leading edge. Fluid 8 (mm) 8, (mm) Air Water i Engine Oil Mercury

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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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. Fluid 8 (mm) 8; (mm) Air i 2.819 i 3.164 Water i i Engine Oil i Mercury i i
Example 1 Engine oil at 60°C flows over a 5 m long flat plate whose temperature is 20°C with a velocity of 2 m/s with a surface film temperature of 40°C. The density, thermal conductivity, Prandlt No. and kinematic viscosity are 876 kg/m², 0.144 W/m.K, 28270, and 242 x 10$ m²/s, respectively. Determine the total drag force and the rate of heat transfer per unit width of the entire plate. oil T- = 60°C V-=2 m/s T=20°C- L= 5 m We assume the critical Reynolds number is 5x105. The properties of the oil at the film temperature are:
Water at 45.0oC flows over a large plate at a velocity of 30.0 cm/s. The plate is 1.0 m long (in the flow direction), and its surface is maintained at a uniform temperature of 5.0oC. Calculate the steady rate of heat transfer per unit width of the plate. Properties The properties of air at 1 atm and the film temperature of (Ts+T∞)/2 = (5+45)/2 = 25°C are: ρ = 996.6 kg/m3, k = 0.610 W/m.oC, μ = 0.854x10-3 kg/m.s, Pr = 5.85