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output rate formula

Author	Topic: output rate formula
gpedicino Member Posts: 2 From:Guarenas,Miranda,Venezuela Registered: Jul 2007	posted July 25, 2007 08:41 PM I´m working in the Output rate formula, I know that it comes from: Qt = Qd +- Qp, Drag flow rate + or - Pressure flow rate. I have some problems with the pressure flow rate: How can I calculate the incremental pressure difference. When can I consider that one equal to zero. Regards. Giacomo IP: Logged
Tom C Moderator Posts: 872 From:Brodheadsville, PA USA Registered: Jun 2001	posted July 25, 2007 08:55 PM If you have a vented screw, the pressure is zero at the vent using an estimated head pressure then you can make the calculation. The most difficult part is knowing the viscosity. Are you interested in some professional software that can make these calculations? ------------------ Best Regards, Tom Cunningham www.ExtrusionTechnicalServices.com IP: Logged
gpedicino Member Posts: 2 From:Guarenas,Miranda,Venezuela Registered: Jul 2007	posted July 25, 2007 10:10 PM Ok. Some sofware can help, but first of all I want to learn about how to calculate that. If I have the viscosity from table of polymers. How can I calculate the pressure diference. Best regards Giacomo IP: Logged

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