A flat plate is experiencing a parallel air flow over the top surface with an average frictioncoefficient (CF) of 1.842×104. All properties of air are listed in the figure. What is theaverage convection coefficient (h) on the top surface? Please show the complete analysisprocedure.u = 40 m/sPr = 0.7Ts > Toop=1.018 kg/m³C = 1.842x10-4Cp= 1009 J/kgKModified Reynolds AnalogyfCƒ = 2St Pr²/3 (0.6 < Pr < 60)(6.70)

Answered: A flat plate is experiencing a parallel…

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 5.25P

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A horizontal thin plate with a length of L= 10 cm is tiled with a constant heat flux from the bottom and is cooled by air at the top. The air velocity is U = 40 m / s and the temperature is 20 ° C. What should be the minimum heat flux so that the plate temperature does not exceed 80°C? (kW / m²) v 17.94 x 10-6 m²/s = 0.0277 W/(m.K) Pr = 0.71
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Air is forced to flow over 15 m long flat plate as shown in the following figure with velocity of 9.9 m/s. What is the local forced convection heat transfer coefficient (in W/m2.K) at X= 3.9 m? (For air use, k= 0.03 W/m.K, Pr= 0.7, v= 1.8 x 10-5 m²/s). Air V X L= 15 m Isothermal surface
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Which of the following statement is wnong? O a. In the boundary layer region the frictional effect is negligible O b. The heat transfer in liguid and gases takes place according to conwection Oc The amount of heat flow througha body is dependert upon the material of the body O d. The logarithmic mean temperature difference is not equal to the arithmetic mean temperature difference
Heat transfers Air at temperature 20 C and pressure 1 atm, flow over a flat plate at 3 m/s. The surface temperature of the plate 60 C and the plate width 30 cm, at distance 30 cm from the leading edge .Take the air properties as following, µ=2.02x10^-5 kg/m.s, k=0.0292 W/m.C, Cp=1.01 kJ/kg.C, : ρ = 1.128 kg/ m3, Pr=0.7. Choose the correct answer:
Air at 295 K flows at 3 m/s over a flat plate at 390 K. The air properties are as follows: density =1.1 kg/m3, viscosity =18.1×10−6 Pa.s, specific heat capacity =1005 J/kgK, and thermal conductivity =0.024 W/mK. The velocity and temperature profiles are assumed to be linear, giving the local Nusselt number to be Nux = 0.289 Rex1/ 2Pr1/3. The flow will become turbulent at a Reynolds number of 5×105. Assume the width of the plate perpendicular to the air flow is 1 m. At what distance from the leading edge does the flow become turbulent? ________m What is the heat transfer at the point of transition? ___________W What is the total heat transfer along the length of the plate where the flow is laminar? __________W
Required information Water at 20°C is flowing with velocity of 0.89 m/s between two parallel flat plates placed 1 cm apart. Given: The properties of water at 20°C are p= 998.0 kg/m3, µ = 1.002 x 103 kg/m-s and Pr = 7.01 Determine/the distance from the entrance at which the velocity boundary layers meet. (Round the final answer to one decimal place.) The distance from the entrance at which the velocity boundary layers meet is m.
Calculate the heat transfer (in Watts) in the first 20 cm of the plate assuming unit depth, if the plate is heated to a temperature of 100C over it complete length with air flowing over it at a temperature of 27°C. [Properties of air at 63.5°C are: k = 0.02749 W/mK, v = 17.36 x 10“ m/s, Cp = 1.006 kJ/kg K and Pr= 0.7.]
Q 3(c) Consider a cylindrical copper rod in which there is a unifom volumetric heating q = 12 kW/m³. The rod is in a cross flow of air at velocity and temperature which are v. = 10 m/s and T, = 350 K respectively. The rod surface temperature is Ts = 400K. The rod outer diameter and length are D = 5 cm and L = 50 cm respectively. Assume natural convection and radiation to be negligible and you can neglect heat transfer from the tips of the cylinder. I. Estimate the drag experienced by the rod. II. Find the average convection heat transfer coefficient which characterises convection from the outer surface using the appropriate correlation. III. Find the time rate of change of temperature of the full rod at the initial time when the rod is first placed in the air flow. Air Properties: At T. = 350 K: v = 20.92 x 10-6 m2/s, p = 1 kg/m3 k = 30 x 10-3W/m. K, Pr = 0.70 At T, = 400 K: p = 0.871 kg/m3 , u = 230 x 10-7 N.s/m?, Pr, = 0.69 Copper Properties: At T, = 400 K: p = 8900 kg/m , c = 385…
What is the rate of heat loss through a 4-cm Fiberglass wall of the inside temperature is 22 °C and the outside temperature is 45 °C and windy (17 kph) ? the area of the wall is 100 square meters. Include surface films. Assume the k-value for 4-cm fiberglass is 0.056 W/m. °C and the surface air film coefficient for windy velocity (17 kph) is 0.053 for out film and the inner film Rs value is 0.093 as per the surface film coefficient tables ?

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