| Autor: |
ZHANG Yan, WU Zhiguo, DAI Huiliang, CHEN Ruling |
| Předmět: |
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| Zdroj: |
Journal of Donghua University (Natural Science Edition); Jun2023, Vol. 49 Issue 3, p136-142, 7p |
| Abstrakt: |
A new type of blunt nozzle structure and a new type of sharp nozzle structure were designed on the basis of the common slot die to further reduce the melt blowing fiber diameter and improve the filtration efficiency of the melt blowing products. Based on the computational fluid dynamics method, the software of Fluent 6.3.26 was used to simulate the velocity, temperature and turbulence intensity of the melt blowing airflow field. The results illustrate that the new sharp nozzle structure can reduce the velocity and the temperature decay in the airflow field. Meanwhile, it can effectively alleviate the reverse velocity in the recirculation zone and reduce the turbulence intensity on the centerline of the airflow field near the end of the nozzle, which is conducive to obtaining smaller diameter fibers. In addition, the longer the extension length of the new sharp nozzle, the greater the velocity and temperature of the air flow field. The effect of reducing heat dissipation and refinement of the fiber is more conducive with the elongation of extension length. When the extension length is 5 mm, the peak of turbulence intensity near the end face of the nozzle is the smallest, which is conducive to fiber refinement. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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