24.53 For fluid flow over a surface, the heat flux to the surface can be computed as dT J = -k- dy where J = heat flux (W/m), k = thermal conductivity (W/m K), T = temperature (K), and y distance normal to the surface (m). The following measurements are made for air flowing over a flat plate that is 200 cm long and 50 cm wide: У, ст 1 T, K 900 480 270 200 If k = 0.028 J/s m K, (a) determine the flux at the surface and (b) the heat transfer in watts. Note that 1 J = 1 W s.
24.53 For fluid flow over a surface, the heat flux to the surface can be computed as dT J = -k- dy where J = heat flux (W/m), k = thermal conductivity (W/m K), T = temperature (K), and y distance normal to the surface (m). The following measurements are made for air flowing over a flat plate that is 200 cm long and 50 cm wide: У, ст 1 T, K 900 480 270 200 If k = 0.028 J/s m K, (a) determine the flux at the surface and (b) the heat transfer in watts. Note that 1 J = 1 W s.
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Please answer both question and need so fast. Thank u
![24.53 For fluid flow over a surface, the heat flux to the surface can
be computed as
IP
J = -k-
dy
where J = heat flux (W/m), k = thermal conductivity (W/m · K),
T = temperature (K), and y = distance normal to the surface (m).
The following measurements are made for air flowing over a flat
plate that is 200 cm long and 50 cm wide:
Y, cm
1
5
Т, К
If k = 0.028 J/s·m· K, (a) determine the flux at the surface and
(b) the heat transfer in watts. Note that 1 J = 1 W s.
24.54 The pressure gradient for laminar flow through a constant
radius tube is given by
900
480
270
200
%3!
dp
8µ Q
dx
where p = pressure (N/m), x = distance along the tube's centerline
(m), u = dynamic viscosity (N · s/m3), Q = flow (m/s), and r =
radius (m).
(a) Determine the pressure drop for a 10-cm length tube for a vis-
cous liquid (u = 0.005 N s/m, density = p = 1 x 10' kg/m)
with a flow of 10 x 10-6 m'/s and the following varying radii
along its length,
%3D
х, ст
2
4
10
T, mm
1.35
1.34
1.6
1.58
1.42
(b) Compare your result with the pressure drop that would have
occurred if the tube had a constant radius equal to the average
radius.
(c) Determine the average Reynolds number for the tube to verify
that flow is truly laminar (Re = pvD/µ < 2100 where v =
velocity).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff24d02ba-bb98-4263-8ecb-42c1ac64c463%2F00d31c50-6ec5-48c0-b9c4-180b56f3d1f8%2Fqc81mjx_processed.jpeg&w=3840&q=75)
Transcribed Image Text:24.53 For fluid flow over a surface, the heat flux to the surface can
be computed as
IP
J = -k-
dy
where J = heat flux (W/m), k = thermal conductivity (W/m · K),
T = temperature (K), and y = distance normal to the surface (m).
The following measurements are made for air flowing over a flat
plate that is 200 cm long and 50 cm wide:
Y, cm
1
5
Т, К
If k = 0.028 J/s·m· K, (a) determine the flux at the surface and
(b) the heat transfer in watts. Note that 1 J = 1 W s.
24.54 The pressure gradient for laminar flow through a constant
radius tube is given by
900
480
270
200
%3!
dp
8µ Q
dx
where p = pressure (N/m), x = distance along the tube's centerline
(m), u = dynamic viscosity (N · s/m3), Q = flow (m/s), and r =
radius (m).
(a) Determine the pressure drop for a 10-cm length tube for a vis-
cous liquid (u = 0.005 N s/m, density = p = 1 x 10' kg/m)
with a flow of 10 x 10-6 m'/s and the following varying radii
along its length,
%3D
х, ст
2
4
10
T, mm
1.35
1.34
1.6
1.58
1.42
(b) Compare your result with the pressure drop that would have
occurred if the tube had a constant radius equal to the average
radius.
(c) Determine the average Reynolds number for the tube to verify
that flow is truly laminar (Re = pvD/µ < 2100 where v =
velocity).
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