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ABSTRACT
The quantity Xv/Q at ground level has been plotted for effluents emitted at a height of 400m as function of distance from the source where X/Q is dilution factor and v is average wind speed. The objective of this exercise is to observe the variation of the quantity with distance in six Pasquill conditions namely A (extremely unstable), B (moderately unstable), C (slightly unstable), D (neutral), E (slightly stable) and F (moderately stable). The values of horizontal and vertical dispersion coefficients has been taken from set of curves experimentally obtained by Pasquill published in “Introduction to Nuclear Engineering” by John R. Lamarsh.
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OBSERVATIONS AND CALCULATIONS FOR Xv/Q.
Table 1: Comparison of stability of Pasquill conditions
Distance (x) A B C D E F 100 4.6E- 181 1.1E- 290 0 0 0 0 200 1.07E- 45 6.12E- 91 5.4E- 181 0 0 0 400 9.34E- 12 2.29E- 26 1.12E- 55 2.8E- 158 1E- 290 0 700 1.69E- 06 1.18E- 11 1.62E- 23 1.33E- 64 3.1E- 124 8.8E- 291 1000 2.21E- 06 2.51E- 08 2.29E- 14 1.72E- 38 4.89E- 83 3.7E- 181 2000 4.1E- 07 1.03E- 06 3.27E- 08 6.2E- 19 8.6E- 35 3.72E- 76 4000 8.41E- 07 7.49E- 07 2.33E- 11 1.22E- 19 6.01E- 41 7000 4.02E- 07 7.82E- 07 8.7E- 09 1.7E- 13 5.87E- 28 10000 1.9E- 07 5.47E- 07 5.32E- 08 2.6E- 11 9.58E- 22 20000 5.06E- 08 1.99E- 07 2.32E- 07 5.12E- 09 2.37E- 15 100000 1.26E- 07 5.72E- 08 9.57E- 11
Figure 1 The quantity (χv/Q) at ground level,, for the effluents emitted at a height of 400m, as a function of distance from the source
DISCUSSION
It has been observed that the value of Xv/Q rises to a maximum value and then decreases more or less exponentially. Furthermore under relatively unstable conditions the maximum value occurs near the source while it is farther from the source in case of stable conditions.
-5E-
0
500 5000 50000
A B C D E F
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