online_hagen_poiseuille_headloss:    Head loss with the Hagen-Poiseuille equation Comparison of laminar and turbulent flow Formulas:       128 Q ν L hL = ______________   ;   ν = f(T)         g π D4 [SI units: Q in m3/s; L in m; D in m; T in °C; hL in m] [U.S. units: Q in cfs; L in ft; D in ft; T in °F; hL in ft] Discharge with Hagen-Poiseuille INPUT DATA: Select:   SI units (metric) U.S. Customary units Discharge Q :         Warning: Undefined variable $dischargeunits in /var/www/html/ponce/onlinehagenpoiseuilleheadloss.php on line 374 Diameter D :         Warning: Undefined variable $diameterunits in /var/www/html/ponce/onlinehagenpoiseuilleheadloss.php on line 381 Temperature T :         Warning: Undefined variable $temperatureunits in /var/www/html/ponce/onlinehagenpoiseuilleheadloss.php on line 388 Pipe length L :         Warning: Undefined variable $pipelengthunits in /var/www/html/ponce/onlinehagenpoiseuilleheadloss.php on line 395 OUTPUT: hL =  Warning: Undefined variable $headloss in /var/www/html/ponce/onlinehagenpoiseuilleheadloss.php on line 406 Deprecated: round(): Passing null to parameter #1 ($num) of type int|float is deprecated in /var/www/html/ponce/onlinehagenpoiseuilleheadloss.php on line 406 0   Warning: Undefined variable $headlossunits in /var/www/html/ponce/onlinehagenpoiseuilleheadloss.php on line 406 • Hagen-Poiseuille on Wikipedia   Your request was processed at  11:13:57 pm on April 3rd, 2025   [ 250403  23:13:57 ]. Thank you for running online_hagen_poiseuille_headloss.   [160603]