Effect of Model Structure on Thermal Conductivity of Sandwich Composites

2014 ◽  
Vol 941-944 ◽  
pp. 2478-2481
Author(s):  
Yang Fu Jin ◽  
Cheng Zhang ◽  
Xin Qian ◽  
Fang Qin Yang
Keyword(s):  
Thermal Conductivity ◽  
Unsaturated Polyester ◽  
Composite Model ◽  
Sandwich Composite ◽  
Solid Model ◽  
Equivalent Thermal Conductivity ◽  
Conductive Materials ◽  
Thermal Transmission ◽  
Corrosive Resistance ◽  
Better Than

Heat conductive materials, which widely used in the field like electronic information, electrical engineering and aerospace, are required high thermal conductivity, excellent electrical insulation, corrosive resistance, chemical stability and so on. In this paper, metal/unsaturated polyester (UP) sandwich composite is prepared to use as heat conductive material. Hollow and solid model are prepared to study their capacity of thermal transmission by software ANSYS and experiment. The results showed that capacity of solid model thermal transmission increased with increasing the number of wires. Equivalent thermal conductivity of solid composite model is 3 times more than that of pure UP. Heat transfer effect of hollow composite model is better than that of solid composite model, even though the latter has two layers of wires more than the former.

Simulation of Thermal Conductivity of Sandwich Composite

2013 ◽  
Vol 278-280 ◽  
pp. 523-526
Author(s):  
Fang Qin Yang ◽  
Yang Fu Jin ◽  
Xin Qian
Keyword(s):  
Thermal Conductivity ◽  
Unsaturated Polyester ◽  
Steel Wire ◽  
Longitudinal Direction ◽  
Sandwich Composite ◽  
Electronic Information ◽  
Equivalent Thermal Conductivity ◽  
Conductive Materials ◽  
Thermal Transmission ◽  
Corrosive Resistance

Heat conductive materials, which are widely used in the fields like electronic information, electrical engineering and aerospace, are required high thermal conductivity, excellent electrical insulation, corrosive resistance, chemical stability and so on. In this paper, steel/unsaturated polyester (UP) sandwich composite is designed to use as heat conductive material. The capacity of composite thermal transmission with steel wire arrangements in longitudinal and transverse directions are analyzed by software ANSYS. Finally, equivalent thermal conductivity of composite is calculated. The results show that capacity of composite’s thermal transmission increases quickly with increasing number of steel wire in the longitudinal direction，but it increases slowly with the increasing number of steel wire in the transverse direction.

Study on Thermal Conductivity of Metal/Polymer Composites Based on Software ANSYS

2013 ◽  
Vol 634-638 ◽  
pp. 2056-2059
Author(s):  
Fang Qin Yang ◽  
Yang Fu Jin ◽  
Xin Qian
Keyword(s):  
Experimental Data ◽  
Thermal Conductivity ◽  
Unsaturated Polyester ◽  
Average Error ◽  
Electronic Information ◽  
Conductive Material ◽  
Conductive Materials ◽  
Thermal Transmission ◽  
Metal Polymer ◽  
Corrosive Resistance

Heat conductive materials, which widely used in the field like electronic information, electrical engineering and aerospace, are required high thermal conductivity, excellent electrical insulation, corrosive resistance, chemical stability and so on. In this paper, metal/unsaturated polyester (UP) composite is prepared to use as heat conductive material. Capacity of composite thermal transmission is analyzed by software ANSYS and experiment. The results show that the capacity of composite thermal transmission increases with increasing metal wire diameter and metal thermal conductivity. Average error between simulation and experimental data is 6.08%.

Basic Study on Effects of Water Content on Printing Paper on Equivalent Thermal Conductivity

2018 ◽  
Vol 2018 (1) ◽  
pp. 41-43
Author(s):  
Takashi Fukue ◽  
Hirotoshi Terao ◽  
Koichi Hirose ◽  
Tomoko Wauke ◽  
Hisashi Hoshino ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Water Content ◽  
Basic Study ◽  
Equivalent Thermal Conductivity ◽  
Printing Paper

A Study of Some Mechanical and Physical Properties for Palm Fiber/Polyester Composite

2020 ◽  
Vol 38 (3B) ◽  
pp. 104-114
Author(s):  
Samah M. Hussein
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Dielectric Constant ◽  
Date Palm ◽  
Volume Fraction ◽  
Unsaturated Polyester ◽  
Dielectric Strength ◽  
Palm Fiber ◽  
Mechanical And Physical Properties ◽  
Polyester Composite

This research has been done by reinforcing the matrix (unsaturated polyester) resin with natural material (date palm fiber (DPF)). The fibers were exposure to alkali treatment before reinforcement. The samples have been prepared by using hand lay-up technique with fiber volume fraction of (10%, 20% and 30%). After preparation of the mechanical and physical properties have been studied such as, compression, flexural, impact strength, thermal conductivity, Dielectric constant and dielectric strength. The polyester composite reinforced with date palm fiber at volume fraction (10% and 20%) has good mechanical properties rather than pure unsaturated polyester material, while the composite reinforced with 30% Vf present poor mechanical properties. Thermal conductivity results indicated insulator composite behavior. The effect of present fiber polar group induces of decreasing in dielectric strength, and increasing dielectric constant. The reinforcement composite 20% Vf showed the best results in mechanical, thermal and electrical properties.

scholarly journals The Equivalent Thermal Conductivity of the Micro/Nano Scaled Periodic Cubic Frame Silver and Its Thermal Radiation Mechanism Analysis

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4158
Author(s):  
Haiyan Yu ◽  
Haochun Zhang ◽  
Heming Wang ◽  
Dong Zhang
Keyword(s):  
Thermal Conductivity ◽  
Thermal Radiation ◽  
Cell Size ◽  
Near Infrared ◽  
High Porosity ◽  
Mechanism Analysis ◽  
Infrared Band ◽  
Spectral Radiation ◽  
Radiation Mechanism ◽  
Equivalent Thermal Conductivity

Currently, there are few studies on the influence of microscale thermal radiation on the equivalent thermal conductivity of microscale porous metal. Therefore, this paper calculated the equivalent thermal conductivity of high-porosity periodic cubic silver frame structures with cell size from 100 nm to 100 µm by using the microscale radiation method. Then, the media radiation characteristics, absorptivity, reflectivity and transmissivity were discussed to explain the phenomenon of the radiative thermal conductivity changes. Furthermore, combined with spectral radiation properties at the different cross-sections and wavelength, the radiative transmission mechanism inside high-porosity periodic cubic frame silver structures was obtained. The results showed that the smaller the cell size, the greater radiative contribution in total equivalent thermal conductivity. Periodic cubic silver frames fluctuate more in the visible band and have better thermal radiation modulation properties in the near infrared band, which is formed by the Surface Plasmon Polariton and Magnetic Polaritons resonance jointly. This work provides design guidance for the application of this kind of periodic microporous metal in the field of thermal utilization and management.

scholarly journals Effective Thermal Conductivity of Open Cell Polyurethane Foam Based on the Fractal Theory

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Kan Ankang ◽  
Han Houde
Keyword(s):  
Thermal Conductivity ◽  
Fractal Dimension ◽  
Effective Thermal Conductivity ◽  
Polyurethane Foam ◽  
Solid Phase ◽  
Fractal Theory ◽  
Heat Radiation ◽  
Total Thermal Conductivity ◽  
Equivalent Thermal Conductivity ◽  
Open Cell

Based on the fractal theory, the geometric structure inside an open cell polyurethane foam, which is widely used as adiabatic material, is illustrated. A simplified cell fractal model is created. In the model, the method of calculating the equivalent thermal conductivity of the porous foam is described and the fractal dimension is calculated. The mathematical formulas for the fractal equivalent thermal conductivity combined with gas and solid phase, for heat radiation equivalent thermal conductivity and for the total thermal conductivity, are deduced. However, the total effective heat flux is the summation of the heat conduction by the solid phase and the gas in pores, the radiation, and the convection between gas and solid phase. Fractal mathematical equation of effective thermal conductivity is derived with fractal dimension and vacancy porosity in the cell body. The calculated results have good agreement with the experimental data, and the difference is less than 5%. The main influencing factors are summarized. The research work is useful for the enhancement of adiabatic performance of foam materials and development of new materials.

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