online_hagen_poiseuille_discharge:  Discharge with the Hagen-Poiseuille equation Comparison of laminar and turbulent flow Formulas:      g hL π D4 Q = ______________   ;   ν = f(T)       128 ν L [SI units: hL in m; D in m; T in °C; L in m; Q in m3/s] [U.S. units: hL in ft; D in ft; T in °F; L in ft; Q in cfs] Head loss with Hagen-Poiseuille INPUT DATA: Select:   SI units (metric) U.S. Customary units Head loss hL :         Warning: Undefined variable $headlossunits in /var/www/html/ponce/onlinehagenpoiseuilledischarge.php on line 373 Diameter D :         Warning: Undefined variable $diameterunits in /var/www/html/ponce/onlinehagenpoiseuilledischarge.php on line 380 Temperature T :         Warning: Undefined variable $temperatureunits in /var/www/html/ponce/onlinehagenpoiseuilledischarge.php on line 387 Pipe length L :         Warning: Undefined variable $pipelengthunits in /var/www/html/ponce/onlinehagenpoiseuilledischarge.php on line 394 OUTPUT: Q =  Warning: Undefined variable $discharge in /var/www/html/ponce/onlinehagenpoiseuilledischarge.php on line 405 Deprecated: round(): Passing null to parameter #1 ($num) of type int|float is deprecated in /var/www/html/ponce/onlinehagenpoiseuilledischarge.php on line 405 0   Warning: Undefined variable $dischargeunits in /var/www/html/ponce/onlinehagenpoiseuilledischarge.php on line 405 • Hagen-Poiseuille on Wikipedia   Your request was processed at  11:02:23 pm on April 3rd, 2025   [ 250403  23:02:23 ]. Thank you for running online_hagen_poiseuille_discharge.   [160603]