Need Help with a Pressure Drop Formula

[srini_duv]

Hi Folks,

I require help with a pressure drop formula.

We were entrusted to reverse engineer an application that calculates the pressure drop in filters. We are not from this background. We have isolated the equations from the code and have reconstructed an expression. The pressure drop formula is for Turbulent and Laminar flow. The following are the formulae:


Pressure drop across filter housing:-
For turbulent flow:-
e^((((((0.69314718 * log_2⁡volmin / 2.302585092994 * TurbTe + TurbBa) / (0.69314718 *log_2⁡visck)) + TurbSt) * 0.69314718 * log_2⁡vsck))

For laminar flow:-

e^((((((0.69314718 * log_2⁡volmin / 2.302585092994 * LamTe + LamBa) / (0.69314718 *log_2⁡visck)) + LamSt) * 0.69314718 * log_2⁡vsck))


Pressure drop in filter element:-
For turbulent flow:-


e^((((((0.69314718 * log_2⁡〖(volmin*1000/area)〗 / 2.302585092994 * TurbTe + TurbBa) / (0.69314718 *log_2⁡visck)) + TurbSt) * 0.69314718 * log_2⁡vsck))

For laminar flow:-

e^((((((0.69314718 * log_2⁡〖(volmin*1000/area)〗 / 2.302585092994 * LamTe + LamBa) / (0.69314718 *log_2⁡visck)) + LamSt) * 0.69314718 * log_2⁡vsck))


Here, Volmin is Flow rate in litres/minute & visck is Viscosity in Centi Stoke.

We were however unable to understand the following values:

LamSt, LamTe, LamBa, TurbSt, TurbTe, TurbBa.

Whilst we understand Lam is short for ‘Laminar’ and ‘Turb’ is short for ‘Turbulent’, we could not get the meaning of St, Ba & Te.

Any help in this regard would be greatly appreciated.

regards,
Srinivas Duvvuri

[admin]

Do you have authorization from application manufacturer to do this thing?

[srini_duv]

Yes we do. From the application owner. The application is very old and the manufacturer is no longer available - may be not in business anymore. Which is the whole reason why we are trying to re-engineer it to a recent technology. This is some custom application that was never distributed. Probably some people were hired to develop this application. They did. No notes as such. Now we are stuck.

Regards,
Srinivas Duvvuri