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7. Measurement Principle
Heat diffusion quantity can be found by;
(
πλ
=
−
l
Q
N
T
T
u
Q: Heat diffusion quantity
L: Length of cylinder
In order to obtain the property value of mixed gas, obtain the property value of each component. Based on the
mixing ratio, the property value of the mixture can be found. For instance, the specific heat of mixture, C
found by;
Σ
C
M
Y
=
1
1
1
p
········ (2)
C
p
100
M
C
: Specific heat of mixture
p
M：Molecular quantity of mixture
Y
：: Volume percentage of each component gas
1
As each property value is temperature function and Nusselt number, N
diffusion quantity in the mixed gas (Q
velocity, U
using the above equation (1). Given that the Q
0
velocity value, U
, can be obtained. With U
M
obtained.
Below is and example graph for air velocity compensation.
50
40
30
20
10
Figure 3 Example Graph for Air Velocity Compensation
)
········ (1)
a
N
: Nussselt number
u
T: Heating body temp.
) can be find by obtaining the air temperature, T
a
and U
0
Air Temp. 100˚C
Air Temp. 300˚C
Air Temp. 500˚C
10
20
Reference Velocity Value U
π:Circle ratio
T
:Gaseous temperature
a
C
: The specific heat of each component gas
p1
M
：: Molecular quantity of each component gas
1
is equivalent to the diffusion quantity in the air, the air
a
, the air velocity compensation table for the mixed gas can be
M
Component
N
2
H
O
2
O
2
CO
30
40
50
m/β
0
λ：Thermal conductivity
, is function of flow velocity (U), heat
u
, and the reference air
a
Mixing Ratio %
74.0
11.5
3.5
11.0
41
, can be
ｐ
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