Thermal Behavior of Aerogel-Embedded Nonwovens in Cross Airflow

Xiaoman Xiong 1 , 3 , Mohanapriya Venkataraman 1 , Darina Jašíková 2 , Tao Yang 1 , 3 , Rajesh Mishra 1 , Jiří Militký 1  and Michal Petrů 3
  • 1 Technical University of Liberec, Liberec
  • 2 Institute for Nanomaterials, Advanced Technologies and Innovations, Department of Physical Measurements, Liberec
  • 3 Institute for Nanomaterials, Advanced Technologies and Innovation, Department of Machinery Construction, Liberec

Abstract

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.

If the inline PDF is not rendering correctly, you can download the PDF file here.

  • [1] Pierre, A. C., Pajonk, G. M. (2002). Chemistry of aerogels and their applications. Chemical Reviews, 102(11), 4243-4265.

  • [2] Dorcheh, A. S., Abbasi, M. H. (2008). Silica aerogel: synthesis, properties and characterization. Journal of Materials Processing Technology, 199, 10-26.

  • [3] Maleki, H., Durães, L., Portugal, A. (2014). An overview on silica aerogels synthesis and different mechanical reinforcing strategies. Journal of Non-Crystalline Solids, 385, 55-74.

  • [4] Stepanian, C. (2007). Patent No. 20070154698 A1(US). 07, 05, 2007.

  • [5] Oh, K. W., Kim, D. K., Kim, S. H. (2009). Ultra-porous flexible PET/Aerogel blanket for sound absorption and thermal insulation. Journal of Fibers & Polymers, 10, 731-737.

  • [6] Prevolnik, V., Zrim, P.K., Rijavec, T. (2014). Textile technological properties of laminated silica aerogel blanket. Contemporary Materials, V-1, 117-123.

  • [7] Nocentini, K., Achard, P., Biwole, P., Stipetic, M. (2018). Hygro-thermal properties of silica aerogel blankets dried using microwave heating for building thermal insulation. Energy and Buildings, 158, 14-22.

  • [8] Wolf, S. (1967). A theory for the effects of convective air flow through fibrous thermal insulation. ASHRAE Transactions, 72(2), 111.2.1-111.2.9.

  • [9] Angirasa, D. (2002). Forced convective heat transfer in metallic fibrous materials. Journal of Heat Transfer, 124(4), 739-745.

  • [10] Powell, F., Krarti, M., Tuluca, A. (1989). Air movement influence on the effective thermal resistance of porous insulations: a literature survey. Journal of Thermal Insulation, 12(3), 239-251.

  • [11] Lee, S. C., Cunnington, G. R. (1998). Heat transfer in fibrous insulations: comparison of theory and experiment. Journal of Thermophysics and Heat Transfer, 12(3), 297-303.

  • [12] Bhattacharjee, D., Kothari, V. K. (2008). Prediction of thermal resistance of woven fabrics. Part II: Heat transfer in natural and forced convective environments. Journal of the Textile Institute, 99(5), 433-449.

  • [13] Tung, K., Shiau, J., Chuang, C., Li, Y., Lu, W. (2002). CFD analysis on fluid flow through multifilament woven filter cloths. Separation Science and Technology, 37(4), 799-821.

  • [14] Venkataraman, M., Mishra, R. Militky, J., Behera, B. K. (2016). Modelling and simulation of heat transfer by convection in aerogel treated nonwovens. Journal of the Textile Institute, 108(8), 1442-1453.

  • [15] Venkataraman, M., Mishra, R., Subramaniam, V., Gnanamani, A., Kotresh, T. M., et al. (2016). Dynamic heat flux measurement for advanced insulation materials. Fibers and Polymers, 17(6), 925-931.

  • [16] Venkataraman, M., Militky, J., Mishra, R., Jandova, S. (2018). Unconventional measurement methods and simulation of aerogel assisted thermoregulation. Journal of Mechanical Engineering, 5, 62-96.

  • [17] Bergman, T. L., Incropera, F. P. (Eds.). (2011). Fundamentals of heat and mass transfer. (7th ed.). Wiley Publishing (Hoboken).

  • [18] Burleigh, E. G., Jr., Wakeham, H., Honold, E., Skau, E. L. (1949). Pore-size distribution in textiles. Textile Research Journal, 19(9), 547-555.

  • [19] Ocallaghan, P. W., Probert, S. D. (1979). Effect of air velocity on thermal insulation systems. Applied Energy, 5(4), 311-318.

OPEN ACCESS

Journal + Issues

Search