Next Article in Journal
Correction: An Extended Damage Plasticity Model for Shotcrete: Formulation and Comparison with Other Shotcrete Models
Previous Article in Journal
Influence of the Composition, Structure, and Physical and Chemical Properties of Aluminium-Oxide-Based Sorbents on Water Adsorption Ability
Open AccessArticle

Modelling and Characterization of Effective Thermal Conductivity of Single Hollow Glass Microsphere and Its Powder

by Bing Liu 1, Hui Wang 1,2,* and Qing-Hua Qin 3,*
1
College of Civil Engineering and Architecture, Henan University of Technology, Zhengzhou 450001, China
2
State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China
3
Research School of Engineering, Australian National University, Canberra, ACT 2600, Australia
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(1), 133; https://doi.org/10.3390/ma11010133
Received: 18 December 2017 / Revised: 4 January 2018 / Accepted: 13 January 2018 / Published: 14 January 2018
Tiny hollow glass microsphere (HGM) can be applied for designing new light-weighted and thermal-insulated composites as high strength core, owing to its hollow structure. However, little work has been found for studying its own overall thermal conductivity independent of any matrix, which generally cannot be measured or evaluated directly. In this study, the overall thermal conductivity of HGM is investigated experimentally and numerically. The experimental investigation of thermal conductivity of HGM powder is performed by the transient plane source (TPS) technique to provide a reference to numerical results, which are obtained by a developed three-dimensional two-step hierarchical computational method. In the present method, three heterogeneous HGM stacking elements representing different distributions of HGMs in the powder are assumed. Each stacking element and its equivalent homogeneous solid counterpart are, respectively, embedded into a fictitious matrix material as fillers to form two equivalent composite systems at different levels, and then the overall thermal conductivity of each stacking element can be numerically determined through the equivalence of the two systems. The comparison of experimental and computational results indicates the present computational modeling can be used for effectively predicting the overall thermal conductivity of single HGM and its powder in a flexible way. Besides, it is necessary to note that the influence of thermal interfacial resistance cannot be removed from the experimental results in the TPS measurement. View Full-Text
Keywords: hollow glass microsphere; thermal conductivity; transient plane source technique; hierarchical computation hollow glass microsphere; thermal conductivity; transient plane source technique; hierarchical computation
Show Figures

Figure 1

MDPI and ACS Style

Liu, B.; Wang, H.; Qin, Q.-H. Modelling and Characterization of Effective Thermal Conductivity of Single Hollow Glass Microsphere and Its Powder. Materials 2018, 11, 133.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop