Engine oil at 100°C and a velocity of 0.15 m/s flows over both surfaces of a 1.1-m-long flat plate maintained at 20°C.Determine:(a) The velocity and thermal boundary layer thicknesses at the trailing edge.(b) The local heat flux and surface shear stress at the trailing edge.(c) The total drag force and heat transfer per unit width of the plate.Determine the velocity boundary layer thickness & at the trailing edge, in m.8 = imDetermine the thermal boundary layer thicknesses &, at the trailing edge, in m.8, = imDetermine the magnitude of the local heat flux at the trailing edge, W/m².q" x = iW/m²Determine the local surface shear stress at the trailing edge, in N/m².Ts, L = iN/m²Determine the total drag force per unit width of the plate, in N/m.D' = iN/mDetermine the magnitude of the heat transfer per unit width of the plate, in W/m.q' =W/mi

Given: The temperature of engine oil, T = 100 C The speed of engine oil, v = 0.15 m/s The length of…

Answered: Engine oil at 100°C and a velocity of…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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Metal plates of size 60 cm × 50 cm, and thickness 1 cm are initially at 100◦C. They are to be cooled by blowing chilled air at 2 m/sec over both surfaces, the flow being directed along the side whose length is 60 cm. Incoming air temperature is 10◦C. Data for the metal: ρ = 7854 kg/m3, cp = 434 J/kg/K, k = 60.5 W/m/K Data for air: Use values at 50◦C. (a Determine the convective heat transfer coefficient at the surfaces of the plates.(b Determine whether lumped system analysis is applicable(c Assume the convection coefficient is constant, determine how much time is necessary for the temperature of the plates to drop to 25◦C.(d Estimate the total heat lost by a plate when it has reached 25◦C.
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2.0 Engine oil at 100°C and a velocity of 0.25 m/s flows over both surfaces of a 0.8-m-long flat plate maintained at 20°C.Determine:(a) The velocity and thermal boundary layer thicknesses at the trailing edge.(b) The local heat flux and surface shear stress at the trailing edge.(c) The total drag force and heat transfer per unit width of the plate.
Engine oil at 100°C and a velocity of 0.20 m/s flows over both surfaces of a 1.1-m-long flat plate maintained at 20°C. Determine: (a) The velocity and thermal boundary layer thicknesses at the trailing edge. (b) The local heat flux and surface shear stress at the trailing edge. (c) The total drag force and heat transfer per unit width of the plate. Determine the velocity boundary layer thickness & at the trailing edge, in m. 8 = i m Determine the thermal boundary layer thicknesses &, at the trailing edge, in m. 8, = i m Determine the magnitude of the local heat flux at the trailing edge, W/m². q" x = i W/m² Determine the local surface shear stress at the trailing edge, in N/m². Ts, L i N/m² Determine the total drag force per unit width of the plate, in N/m. D' = i N/m Determine the magnitude of the heat transfer per unit width of the plate, in W/m. d' = W/m i
A printed circuit board with constant surface temperature dissipates 100 W from one side over an area (0.3 mx 0.2 m). A fan is use to cool this board with a flow speed of 12 m/s parallel to the longest dimension of the board. Calculate: 1. The surface temperature of the board for an air temperature of 30 C. 2. Thickness of hydrodynamic and thermal boundary layer. 3. Amount of change in heat transfer rate if the flow parallel to the short dimension. Cp-1000 J/kg.K, k-0.03 W/m.C, Pr-0.667, u = 2 x 105 kg/m.s, p=1.15 kg/m³ Laminar flow, Nu= 0.664Rel/2Pr1/3, Turbule flow, Nu= 0.037Re4/5Prl/3
Laminar flow normally persists on a smooth flat plate until a critical Reynolds number value is reached. However, the flow can be tripped to a turbulent state by adding roughness to the leading edge of the plate. For a particular situation, experimental results show that the local heat transfer coefficients for laminar and turbulent conditions are hlam (x) = Alamæª htur (x) - Aturæb Alam = 1.98 a = -0.5 Atur = 4.15 b = -0.3 Calculate the average heat transfer coefficients for laminar and turbulent conditions for plates of length L = 0.2 m and 2.5 m.
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A long aluminum wire of diameter 4 mm at a temperature of 370°C is subjected to cross air flow at 30°C at a velocity of 5.8 m/s. What is the conveçtive heat transfer coefficient (W/m".K)? Air properties: v =3.455×10¨ m /s, Pr = 0.6974, k = 0.03779 W/m.°C -5 Select one:
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