Thermal Behavior of Aerogel-Embedded Nonwovens in Cross Airflow

Autex Research Journal

Petrů Michal¹  Jašíková Darina²  Venkataraman Mohanapriya³  Yang Tao³  Xiong Xiaoman³  Militký Jiří³  Mishra Rajesh³ 

[1] Institute for Nanomaterials, Advanced Technologies and Innovation, Department of Machinery Construction, Technical University of Liberec, Liberec, 461 17, Czech Republic;Institute for Nanomaterials, Advanced Technologies and Innovations, Department of Physical Measurements, Liberec46117, Czech Republic;Technical University of Liberec, Faculty of Textile Engineering, Department of Material Engineering, Liberec46117, Czech Republic;

关键词: nonwoven fabrics;    silica aerogel;    cross airflow;    heat transfer coefficient;   

DOI  :  10.2478/aut-2019-0082

来源: DOAJ

【 摘 要 】

Thermal performance of aerogel-embedded polyester/polyethylene nonwoven fabrics in cross airflow was experimentally studied by using a laboratory-built dynamic heat transfer measuring device in which the fabric could be applied on a heating rod. Experiments were performed with different airflow velocities and heating conditions. The temperature–time histories of different materials were collected and compared. The temperature difference and convective heat transfer coefficient under continuous heating were analyzed and discussed. Results showed that under preheated conditions, the aerogel-embedded nonwoven fabrics had very small decrease in temperature and good ability to prevent against heat loss in cross flow. As for the continuous heating conditions, the heat transfer rate of each material showed an increasing trend with increase in the Reynolds number. The aerogel-treated nonwoven fabric with the least fabric thickness and aerogel content delivered a significantly increased heat transfer rate at higher Reynolds number. Thicker fabrics with higher aerogel content could provide better insulation ability in cross flow.

【 授权许可】

Unknown