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Lect.6 - Convection (Part-1)

The document discusses heat transfer in fluid flow over a heated horizontal plate and provides equations for temperature profiles and heat transfer coefficients. It also includes a scenario involving one-dimensional steady-state heat transfer from a vertical wall into adjacent fluid, detailing parameters like heat flux and thermal conductivity. Additionally, it outlines the Nusselt number and Reynolds number for different flow conditions in flat plates and circular pipes.

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Patel
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15 views5 pages

Lect.6 - Convection (Part-1)

The document discusses heat transfer in fluid flow over a heated horizontal plate and provides equations for temperature profiles and heat transfer coefficients. It also includes a scenario involving one-dimensional steady-state heat transfer from a vertical wall into adjacent fluid, detailing parameters like heat flux and thermal conductivity. Additionally, it outlines the Nusselt number and Reynolds number for different flow conditions in flat plates and circular pipes.

Uploaded by

Patel
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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QA(OT)

Q-hA(OT)

JhnalFratls

X>C T>TX=L
Conectn

forced

2
-hAT
hf(0,,4, kSe, 4T,fow ngino ,P.---)
Fonced Gn vectHon Natral Cnvectien

Nyf(Re, B) Nu=f (Ga.B)


Temp
A fluid flow over a heated horizontal plate maintained at pinp 1.The
bulk temperature of thefluid is T.. The temperature profile in the thermal Ta
boundary layer given by
is
dT
T=T, +(T,
dT
Here y is the vertical distance from the plate0%ysa
.(r-)C25
where Sr is the

thickness of thermal boundary layer and K is the thermal conductivity of

the fluid. Find the local heat transfer coefficient?


K K
(A) (B)
28

28

h, 3K
26t
One dimensional steady state heat-transfer occurs from a flat vertical wall

of length 0.1m into the adjacent fluid. The heat flux into this fluid is

21 W/m. The wall thermal conductivity is 1.73 W/(m-K). If the heat

transfer coefficient is (30W/(m-K)and the Nusselt number based on the

wall length is 20, then the magnitude of the temperature gradient at the

wall on the fluid side (in K/m) is

(A) 0.7 (B) 12.14

(C) 120 (DY40

=20
Nasult No (Nu)

NueRatt of Convective uat Fnster


Rate ot Cmuctive ttut hater
fon Flat Plate

Toh Cisular
Pipt-Nuhd d Aimuter tte Pipe

Raynald'a Ng- (R)-


Trntia ance
Re
Vitcaus Fwce
Fon Fat Plate

Re Jon fbt Plate

Re< 4xlo5 Saminan Flss

Re>5Xo Tobulnt Ele

fon Cincular Pipe

Redur_-Fon Gncular Pipe

Re< 21oDaminar Fleus

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