Nelson Vergel
Founder, ExcelMale.com
I just saw this posted in an old post where we discussed subcutaneous injections. Shaun Noorian from www.EmpowerPharmacy.com came up with this great explanation of how viscosity and needle gauge size affect loading times for testosterone cypionate or enanthate (similar viscosities).
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Now lets figure out which oil is best to use:
Flow Rate can be derived from Poiseuille's Law
As you can see from the equation, pressure gradients when drawing are negligible due to the small cross-sectional area of the needle acting as an effective choke. I ran an experiment with different gauge syringes and our Testosterone Cypionate in Sesame Oil.
As the results show the amount drawn becomes exponentially smaller with a smaller gauge needle. This is due to the Radius^4 variable in our equation.
So what else does Poiseuille's law teach us? When you have a small radius changing the viscosity won't cause a huge difference in flow rates. It's the radius value that dominates the equation, not the viscosity, pressure differential or length. From this, we can determine that the carrier oil wouldn't make a measurable difference in draw time.
---------------------------------------------------
Now lets figure out which oil is best to use:
Flow Rate can be derived from Poiseuille's Law
As you can see from the equation, pressure gradients when drawing are negligible due to the small cross-sectional area of the needle acting as an effective choke. I ran an experiment with different gauge syringes and our Testosterone Cypionate in Sesame Oil.
Size of Needle | 25G | 27G | 29G | 31G |
Amount drawn in 1 minute | 2mL | 0.8mL | 0.32mL | 0.07mL |
As the results show the amount drawn becomes exponentially smaller with a smaller gauge needle. This is due to the Radius^4 variable in our equation.
So what else does Poiseuille's law teach us? When you have a small radius changing the viscosity won't cause a huge difference in flow rates. It's the radius value that dominates the equation, not the viscosity, pressure differential or length. From this, we can determine that the carrier oil wouldn't make a measurable difference in draw time.
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