7. Consider heat transfer due to turbulent flow over a horizontal isothermal flat plate, whereToTs. Which quantities decrease with location along the plate? Circle all answers thatapply.(a) surface temperature(b) thermal boundary layer(c) local heat flux to the surface of the plate(d) local convection heat transfer coefficient

In this scenario, we are considering heat transfer due to turbulent flow over a horizontal…

Answered: 7. Consider heat transfer due to…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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For laminar free convection flow on a vertical plate, a popular correlation 1/4 is Nu, = CRa,*. Derive the values of C from the similarity solution. for Pr = 0.01, 1, 10, and 100. %3D Nu, = hL. = C Ra k (9.24) gB(T, – T)L³ va Ra = Gri Pr = (9.25) 4 GrL 1/4 hL Nu k 8(Pr) %3D 4 0.75Pr2 (0.609 + 1.221Pr2 + 1.238Pr)4 g(Pr) (9.20) 4/3
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
i need the answer quickly
Estimate the natural convection heat transfer coefficient of the horizontal pipe. The outer surface temperature of the pipe is 80 ° C. The ambient air temperature is 40 ° C. The outer diameter of the pipe is 18 cm. Convection coefficient = Answer W / m² ° C.
Air at 305 K flows at 4 m/s over a flat plate at 350 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
(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.

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