1.Consider a flat plate subject to parallel flow (top and bottom) characterized by u =5 m/s, T=20 C.(a) Determine the average convection heat transfer coefficient, convective heat transfer rate, and drag forceassociated with an L = 2-m-long, w = 2-mwide flat plate for airflow and surface temperatures of Ts = 50 °Cand 80 °C.(b) Determine the average convection heat transfer coefficient, convective heat transfer rate, and drag forceassociated with an L = 0.1-m-long, w = 0.1-m-wide flat plate for water flow and surface temperatures of Ts=50 °C and 80 °C.Answer: 3440W 15100W

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Answered: 1. Consider a flat plate subject to…

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 5.49P

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Consider a flat plate subjected to parallel flow (top and bottom) characterized by u∞ = 40 m/s, T∞ = 20 °C, and drag force, FD = 0.075 N. Determine the average convection heat transfer coefficient, and convective heat transfer rate associated with an L = 0.2 m long, w = 0.2 m wide flat plate when the surface temperature is Ts = 120 °C. Air (P = 1 atm, Tf = 70°C): Pr = 0.704, k = 28.0 × 10-3 W/m⋅K, cp = 1009 J/kg⋅K, ν = 1.82 × 10-5 m2/s, ρ = 1.085 kg/m3
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(b) In turbulent flows contrast the approaches that are used to represent the velocity profile within the boundary layer and comment on any limitations that each may offer.
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
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Consider a flat plate subject to parallel flow (top and bottom) characterized by u = 5 m/s, T = 20 °C. a) Determine the average convection heat transfer coefficient, convection heat transfer rate associated with an L =2 m long, w-3 m wide flat plate for air flow and surface temperatures of Ts = 30 °C and Ts = 80 °C. b) Determine the average convection heat transfer coefficient, convection heat transfer rate associated with an L =0.1 m long, w=0.1 m wide flat plate for water flow and surface temperatures of T = 30 °C and T, = 80 °C.
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Air at 400C flows with a velocity of 7 m/s over a 5m long and 4m wilde surface of a flat plate whose surface temperature is 800C. Find the rate of heat transfer from the laminar flow region of the surface. (For air at 400C , V = 1.702 × 10-5 , pr = 0.7255, K = 0.02662 w/m . K). (a) 1.796 KW (b) 2.543 KW (c) 0.796 KW (d) 2.321 KW
HEAT TRANSFER From the heat transfer property table of water, the properties at 20 0C are as follows: Density = 997.36 kg/m3 Kinematic viscosity = 1.026 × 10-6 m2/s Prandtl number = 7.17 (i) Thickness of hydrodynamic boundary layer = 9.24 mm (ii) Thickness of thermal boundary layer = 4.79 mm (iii)Local friction coefficient = 0.001228 Average friction coefficient = 0.002456 ANSWER QUESTION (iv) ,(vi) and B
Introduction to heat convection Solved problems HW-10- 1- Determine the velocity distribution in the velocity boundary layer assuming second degree polynomial: u =C, +C,y+C3y? Answer: The boundary conditions are: du .. u = 0 at y = 0 ; u = u, ; at y = 6 ; = 0 at y = 8 dy и y y This gives: 2.
Consider airflow over a flat plate of length L = 1 m. a) Evaluating the thermophysical properties of air at 400 k, determine the air velocity if the B.L. flow is observed to transition from laminar to turbulent at x = 0.3 m from the leading edge of the plate. b) The local convection coefficients in the laminar and turbulent boundary layers are, respectively, hlam(x) = Clam-x-0.5 and hurb(x) = Cturb-x-0.2 where, Clam = 9.002 W/m³/2. K and Cturb 52.55 W/m¹-8. K, and x has units of m. Develop an expression for the average convection coefficient, hlam (x), as a function of distance from the leading edge, x, for the laminar region, 0 ≤ x ≤ xc. c) Develop an expression for the average convection coefficient, turb (x), as a function of distance from the leading edge, x, for the turbulent region, xc ≤ x ≤ L.. d) Using the programming software of your choice, plot the local and average convection coefficients, hx and hx, respectively, as a function of x for 0 ≤ x ≤ L. e) If the plate has a…
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:

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