Abstract
The internal mixer is an important devise for processing the polymer nanocomposites acting as a chemical reactor. In this article, based on the computational fluid dynamics method, the fluid transportation and heat transfer analysis of sol–gel reaction processing for Polypropylene (PP)/TiO2 nanocomposites in the internal batch mixers with single-winged and two-winged Cam rotors were simulated. First, the Lagrangian coherent structure analysis was used to understand the fluid transport properties in the mixers. Then the effect of rotational speeds (ratios) and barrel temperatures on the heat transfer characteristics in the mixers with different rotors was analyzed. Also, the changes of viscous heating and torques of rotors with different thermal conditions in the mixers were discussed. Especially, the relationship between the fluid transportation and heat transfer characteristics was explored. The results show that a big rotor speed ratio can induce great fluid transportation in the left and right mixer chambers based on the Lagrangian coherent structure analysis, and the fluid near the horseshoe map has great folding effect and temperature magnitude. The viscous dissipation, viscous heat generation, and rotor torques in the mixers increase with increasing the rotational speeds and decrease with increasing the barrel temperatures. The mixer with two-winged rotors has higher average temperature, viscous dissipation, viscous heat generation and the torques of rotors values of reactive fluid than that with single-winged rotors.
Highlights
The internal mixer with asynchronous rotors is an important equipment of polymer industry due to its high mixing efficiency
The PP/ TiO2 nanocomposites are often processed using in situ sol–gel reaction method into the internal mixer and have more excellent material properties than the PP polymer, for example, mechanical properties, flame retardance, and thermal stability.[4,5,6]
The rotor geometric has great influence on the mixing efficiency in the internal mixers, which controls the situ sol–gel reaction to determine the quality of nanocomposites
Summary
The internal mixer with asynchronous rotors is an important equipment of polymer industry due to its high mixing efficiency. The internal rotating mixers have been utilized to process the polymer nanocomposites acting as a batch chemical reactor, typically for processing Polypropylene (PP)/TiO2 nanocomposites.[1,2,3] The PP/ TiO2 nanocomposites are often processed using in situ sol–gel reaction method into the internal mixer and have more excellent material properties than the PP polymer, for example, mechanical properties, flame retardance, and thermal stability.[4,5,6] the rotor geometric has great influence on the mixing efficiency in the internal mixers, which controls the situ sol–gel reaction to determine the quality of nanocomposites. Because the viscous fluid is highly non-isothermal induced by heat transfer, viscous
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