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Fig.D-9 |
![]() | 0 = -i + j + k + 3l + 2m |
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![]() | 0 = i - l |
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![]() | 0 = -2i - j - m | ![]() | ![]() |
1st choice: | It is a good idea to have the first parameter directly proportional to the evaluated pressure drop across the investigated element. This means i=1. On the other hand, this parametr representing the results should not be dependent upon viscosity, as the property representing the input effect. |
2nd choice: | The second parametr should not be dependent upon the pressure drop (i=0) and it is desirable to have here in the first power the most easily and most often varied input variable, velocity w. |
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Vaclav TESAR : "BASIC FLUID MECHANICS"