Introduction
Figure 1 The Free and Forced Convection Apparatus (TD1005)
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TD1005 Free and Forced Convection
Experiment 4: Forced Convection - Fixed Power
Introduction
Aims
Procedure
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TD1005 Free and Forced Convection
Table 3 Blank Results Table
Results Analysis
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TD1005 Free and Forced Convection
Experiment 4: Forced Convection - Fixed Power
-1
Forced Convection at 2 m.s
Maximum Temperature Difference at 15 W Input Power
50
45
40
Ts-Tin (°C)
35
30
25
20
15
10
5
0
Flat
Finned
Pinned
Surfaces
Figure 28 Typical Results
Experiment 5: Forced Convection - Flow Obstruction
Table 10 Typical Results
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TD1005 Free and Forced Convection
Horizontal and Vertical Finned Surfaces
Figure 20 Vertical, Flat and Horizontal Finned Surface
Heat Transfer Coefficient (Convective) (hc)
·
Q
h c = -----------------As Tm
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TD1005 Free and Forced Convection
·
Q
Tm
T OUT – T IN
T m = ------------------------------T S – T IN
log ----------------------T S – T OUT
Nusselt Number (Nu)
hc L
Nu = ------------k air
L
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TD1005 Free and Forced Convection
Heat Transfer Surfaces
Noise Levels
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TD1005 Free and Forced Convection
Free Convection
Forced Convection
Thermal Conductivity of Air (kair)
k
Thermal Conductivity of Air
0.032
Thermal Conductivity (W/mK)
0.031
0.03
0.029
0.028
0.027
0.026
0.025
0.024
0
20
40
60
80
100
Temperature (°C)
Figure 16 Thermal Conductivity of Air
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Flat
T2-T1
Pinned
45
11.5
Forced Convection at 2m/s Maximum
Temperature Difference at15 W lnput Power
50
45
40
35
30
25
20
15
10
5
0
Flat
Pinned