CHE 451 Lecture Notes - Lecture 6: Mass Flow Rate, Shear Rate, Extrusion
22 Jul 2017
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* note : polymer melts are usually non - newtonian shear rate in extruder. It ndbwsobwih - ft )fa - ysti dhtsinlllltfff , N - screw rotation freq . keys ) N - distance htm the screw h - height of blight inner. Fd ~ shape factor for drag how ops~p diff . in screw. Fpnshapefauwtir pressure flow yygyyyttst volumetric how rate caused by :b drag how - caused by screw. 4 pressure flow t. gs#jewq+ttfdtta+n*t6fytyi4t a,=kyop , ( 6 . K - hhtltstt ]3 w mama die constant cab , Hopper : p=xgh from fluid mechanics but here we have solid pellets btw particles & wall. P= a t( compression faces in horizontal dir . compressive forces vertical dir . to in ratioof. If cylinder height is very high lh ) : Can have amid shape or wedge shape : $ ~ angle formed btw solid it and barrel surface. Doing traetorqne balance on screw sample to get : cost.
