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if it was a uniform pitch screw and we know the rpm, we know the feed rate in kg/hr,dia of pipe, length of pipe, pitch ....how do i calculate the speed of material flowing thru it. I also know the density of the dough.I think there is a formula for it. Anyone knows? thanks

also is there a way to calculate the residence time from one point of the extruder to the other end using a formula?...I cannot do a test on it using a colored die and see how much time it takes because its not possile to dismantle the extra arrangement thats attached after the extruder. What i...

Thanks for the reply,....very helpful...... and yes...diffusivity is effective in the extruder because of the screws...how can i calculate the specific heat of the dough?

Thanks for ur reply. I can measure the density and exit temp of the dough.Can i measure temp. at different points in the pipe, using any formula. After that, how do i measure the 1)heat transfer rate, 2)residence time(this can be done by running it offcourse) but can i measure it using any...

Machine ; extruder(heated pipe): lenth of 60cm. Dia of 8cm.Pipe is Heated to 150C Pipe material: iron Product flowing thru: Dough (dough temp. at entry:16C) flow rate: 280kg/hr How do I calculate heat transfer from heated pipe to the dough, residence time of dough in the pipe, exit temp of...