Abstract
The flow behavior of phenolic molding compound in the moldflowchannel is much concerned with the material temperature.
Then, about the phenolic molding compound on the market, we used the constant-rate plunger flow tester for the purpose of taking the informations of flow behavior, and tried to observe the outflowing material temperature by changing with nozzle diameter, nozzle length, wall temperature of the nozzle and flow rate of material.
And we compared the observed value with the theoretically calculated material temperature at the nozzle outlet.
Thus under the following conditions, 1) the flow behavior of melting material follows the Ostwald-de Waele (Power law) model (Fig. 7), tw=mγwn
2) the temperature dependence of the parameter m in the above equation follows Arrhenius' law, m=m*exp (Ef/RoT)
We tried to calculate the outflowing material temperature by considering the changge of the parameter mowing to radial temperature distribution in the nozzle, from the simultaneous equations (the energy equation and the kinetic equation) as follows, ρCpu∂T/∂Z=k [1/r (∂T/∂r) + (∂2T/∂r2)] +μ (∂u/∂r) 2
∂P/∂Z=1∂/r∂r [γμ (∂u/∂r)]
As a result, the agreement between the calculated and the observed outflowing material temperature was confirmed within an error of + 2%. (Fig. 9)
In addition, under the condition of rapid flow in the moldflow channel, frictional heat generation by viscous dissipation was great and could be estimated from the following function of the Eckert number in all our experiments.
TfL (cal) -To/TL/TL (cal) -To/TLexp [0.137lnEc.+3.25]
