Browsing by Author "Xiong, Xiao-Man"
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- ItemElectrical Heating Properties of Carbon Fabric/Green Epoxy Composites Filled with Fly Ash(TEXTILE BIOENGINEERING & INFORMATICS SOCIETY LTD, TBIS 2010 SECRETARIAT MN104, HONG KONG POLYTECHNIC UNIV, HONG KONG SAR, 0000, PEOPLES R CHINA, 2019) Wang, Yuan-Feng; Karthik, Daniel; Yang, Kai; Yang, Tao; Xiong, Xiao-Man; Baheti, Vijay; Militký, JiříThis paper investigates the joule heating behavior and electrical property of the carbon fabric/green epoxy composite laminates filled with various concentrations of unmilled fly ash and milled fly ash. The infrared camera was used to record the change in surface temperature of composites over a period of time (i.e. from 0 to 240 sec) by varying the voltage from 0 to 10 V. The results show that the composite containing 0.5% fly ash exhibited the maximum temperature under different applied voltages. The maximum temperatures of epoxy/carbon composites could be finely tuned by controlling the concentrations of fly ash fillers as well as the applied voltage. When a certain voltage was applied to the composite, the surface composite temperature reached the maximum and became stable at a time shorter than 120s. In addition, the milled fly ash filled epoxy/carbon composites were found to reveal improvement in electrical heating performance and structural stability over the unmilled fly ash filled composites.
- ItemNumerical Modelling of the Acoustic Properties of Polyester Non-woven(TEXTILE BIOENGINEERING & INFORMATICS SOCIETY LTD, TBIS 2010 SECRETARIAT MN104, HONG KONG POLYTECHNIC UNIV, HONG KONG SAR, 0000, PEOPLES R CHINA, 2019) Yang, Tao; Saati, Ferina; Xiong, Xiao-Man; Wang, Yuan-Feng; Yang, Kai; Mishra, Rajesh; Militký, Jiří; Petrů, MichalThis paper investigates the acoustical properties of polyester non-woven by using practical and numerical methods. Several types of non-woven samples made from staple, hollow and bi-component polyester fibres were chosen to carry out this study. The AFD300 Acoustic Flow device was used to measure airflow resistivity. The 45 mm Materiacustica two-microphone impedance tube was used to measure the surface impedance and sound absorption coefficient. Widely used impedance models, such as the Delany-Bazley, Miki, Garai-Pompoli and Komatsu models, were applied to predict acoustical properties. A comparison between measured and predicted values has been performed to derive the most accurate model. The Johnson-Champoux-Allard-Lafarge (JCAL) model was applied to obtain some non-acoustical properties based on the inverse method. It is found that the Delany-Bazley and Miki models can accurately predict the surface impedance of polyester non-woven. The results indicate that the Miki model is the most acceptable method for predicting the sound absorption coefficient, with an 8.39% mean error for all of the samples. The values are 8.92%, 12.58% and 69.67% for the Delany-Bazley, Garai-Pompoli and Komatsu models, respectively. Several difficult-to-obtain parameters have been investigated.
- ItemThermal Behaviour of Multi-layer Composite Containing PEG and Laponite as PCM(TEXTILE BIOENGINEERING & INFORMATICS SOCIETY LTD, TBIS 2010 SECRETARIAT MN104, HONG KONG POLYTECHNIC UNIV, HONG KONG SAR, 0000, PEOPLES R CHINA, 2019) Yang, Kai; Venkataraman, Mohanapriya; Wang, Yuan-Feng; Xiong, Xiao-Man; Yang, Tao; Wiener, Jakub; Militký, Jiří; Mishra, Rajesh; Marek, Jaromír; Zhu, Guo-Cheng; Yao, Ju-MingPolyethylene glycol (PEG) and laponite were prepared together as PCM and a multi-layer composite containing this PCM was developed, consisting of a PCM loaded layer, a nano barrier layer and a protective layer. SEM was used to observe the structure of multi-layer composites containing PCM, with better adhesion observed between the PCM loaded layer, the nano barrier layer and the protective layer. DSC revealed the melting temperature, the cooling temperature and the enthalpy of PEG and laponite as PCM. The multi-layer composite containing PCM was obtained. Laponite functionalized as a nucleating agent to accelerate the crystallization of PEG and 15wt% LP in PCM resulted in a disordered PEG molecular. The composites with more laponite had the higher thermal insulation.
- ItemThermal Performance of Kevlar Woven Fabrics Coated with Silica Aerogel(TEXTILE BIOENGINEERING & INFORMATICS SOCIETY LTD, TBIS 2010 SECRETARIAT MN104, HONG KONG POLYTECHNIC UNIV, HONG KONG SAR, 0000, PEOPLES R CHINA, 2019) Venkataraman, Mohanapriya; Xiong, Xiao-Man; Yang, Tao; Yang, Kai; Wang, Yuan-Feng; Mishra, Rajesh; Militký, JiříKevlar woven fabrics coated with aerogel particles were fabricated via blade coating. Fly ash nanoparticles were incorporated to investigate their effect on thermal performance. Thermal behavior of the prepared fabrics was evaluated and compared by using different techniques. It is found that the aerogels combined with a Kevlar fabric resulted in reduced thermal conductivity and higher thermal resistance. The fly ash coating brought a rapid rise in thermal absorptivity of the overall structure. Under laser radiation with high temperature, the aerogel content played a vital role on the surface temperature of the fabrics. At laser radiations with pixel time 330 mu s, the surface temperatures of the aerogel coated Kevlar fabrics were 400-440 degrees C lower than the uncoated fabric. The results also indicate that the fabric temperature is directly proportional to pixel time. It can be concluded that the Kevlar fabrics coated with silica aerogel provides better thermal protection under high temperature.