Total Flow Area (TFA) is summation of nozzle areas which fluid can pass through. When you consider about the TFA, you need to count all nozzles that you have in a bit or a reamer.
Basically, you can determine flow area with a simple circle area formula.
Where;
Area in
square inch
π is a constant which approximately equates to
3.1429.
D is diameter in
inch
Let’s make it easier for our life. Normally, a diameter of nozzle is reported in
xx/32 inch. For example, a bit has 3 nozzles and each one of them has size of 20/32 inch.
The formula above can be simplified like this.
Where;
Area in
square inch
N is
nozzle size in
number/32 inch.
In order to find the total flow area of each bit or reamer, you must add all area of each nozzle.
For instant, you use a bit that has a total of 5 nozzles. Three nozzles have a diameter of 10/32 inch and other 2 nozzles are 12/32 inch diameter. Determine the total flow area (TFA) of the bit.
By the definition, you must sum every nozzle together in order to get the TFA; therefore, you can apply the formula above into this form.
Total flow area = 0.451 square inch
Reference:
Total Flow Area (TFA) in
drilling formulas blog.
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