Effect of entrance speed of thermal oil on temperature uniformity of granulation belt of granulation template

doi:10.19491/j.issn.1001-9278.2021.12.013

Abstract

Abstract:

The granulation template is one of the main parts of the granulation system. The internal graining template includes the heating channel and the material channel， and the internal flow media in the channel are thermal oil and polyethylene respectively. In this paper， we explored the uniformity of material extrusion velocity and particle size zone temperature distribution in the case of 0.01 m/s， 0.05 m/s， and 0.1 m/s when other conditions are consistent. The effect of the flow heat transmission process of thermal oil on the temperature and flow fields of the granulation template were investigated. The SolidWorks software was used to model the granulation template in a 3D form， and the ANSYS software was used to numerically simulate the flow and heat transmission of polymer and thermal oil. The temperature and fluid flow field distributions of the granulation template were obtained. The results indicated that the import speed of thermal oil generated a significant effect on the temperature field of the granulation template. The import speeds of thermal oil were 0.01 m/s， 0.05 m/s and 0.1m/s under the three conditions， and the extrusion speed of the material did not show a significant change. Moreover， the temperature differences of the granulation belt were 14.08 ℃， 7.14 ℃， and 5.39 ℃. The granulation belt exhibited the most uniform temperature distribution at 0.1 m/s for the thermal oil entrance.

Key words: granulation template, temperature field, flow field, numerical simulation

CLC Number:

TQ325.1

NIU Xu, LIU Yue, ZHANG Yajing. Effect of entrance speed of thermal oil on temperature uniformity of granulation belt of granulation template[J]. China Plastics, 2021, 35(12): 76-80.

Figures/Tables 10

Fig.1. Selection of simulation methods

Fig.2. Diagram of the granulation template structure

材料	密度/kg·m^-3	比热容/J·kg^-1·℃^-1	热导率/W·m^-2·℃^-1
1Cr13不锈钢	7 853	465	16
金属陶瓷	4 900	800	4.5
导热油	850	2 610	0.082
聚乙烯	910	1 600	0.255

Tab.1. Material material parameters

Fig.3. Grid results （local）

Fig.4. Material flow field simulation results

Fig.5. Temperature distribution of the granulation belt

Fig.6. Ten mold holes selected on the granulation belt

试验号

导热油进口

速度/m·s^-1

工作面最高

温度/℃

工作面最低

温度/℃

工作面

温差/℃

Tab.2. Temperature uniformity of the granulation belt at different thermal oil ining speeds

Fig.7. Material flows through the path

Fig.8. Temperature of the material at different locations within the channel

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