Heat Transfer Characteristics of Aluminum Sputtered Fabrics

Abstract

Al was sputtered onto four substrates: nylon, polyester, cotton/polyester, and shape memory polyurethane nanoweb, and the heat-transfer characteristics of the resultant materials were investigated by surface temperature measurements. The thickness of the Al layer increased linearly with sputtering time. The heat-transfer mechanisms of the multilayer systems in terms of conduction, convection, and radiation were investigated under steady-state conditions using a hot plate as a heat source in contact with Al-sputtered fabrics. The Alsputtered fabric was placed on the hot plate, which was maintained at 35°C, and exposed to open air, which was maintained at 15°C. The temperatures of the air-facing surfaces of hot plate-Al-fabric-air (i.e., Al-phase-down) and hot plate-fabric-Al-air (i.e., Alphase-up) systems were used to investigate the heattransfer mechanism. It was found that heat dissipation to ambient air was much higher for the Al-phase-up system than for the Al-phase-down system. Heat-transfer coefficients of the Al surfaces were calculated and found to increase with the thickness of the Al layer. Furthermore, different conductive thermal resistances were observed for different fabrics prepared with the same Al-sputtering time. Consequently, differences in their thicknesses pore sizes, and thermal conductivities were suggested to have significant effects on their heat-transfer properties. Nylon PET Cotton / PET SMPU nanoweb

A study on the thermal and physical properties of nylon fabric treated by metal sputtering (Al, Cu, Ni)

“…The heat transfer rate calculated by this study model was derived through Equations (1)-(3) above, resulting in Equation (4). 28 As seen in Figure 1 and Equation 4, the heat transfer theory by conduction was used for calculation in the case of Material 1. Heat transfer theories by convection and radiation were used for the calculation of Material 2…”

“…The numerical values used for calculation are shown in Table 3. In the case of thickness, the actual measured values were used, and in the case of metal thermal conductivity and emissivity, reference values 28,32 were employed. Also, such reference values were utilized for the nylon fabric's thermal conductivity, emissivity, and heat transfer coefficient.…”

“…In case of the aluminum heat transfer coefficient, a conversion equation based on data in the literature 28 was used to identify a heat transfer coefficient adequate to the study specimens' thickness of the Al layer. When the Al-sputtered fabric's metal layer pointed to the outside air (Figure 7), the heat transfer rate (Q) was high at 3978.8 W, and T2 and T3 subsequently had low temperatures (23.37 C and 23.36 C, respectively).…”

Evaluation of Thermal Properties of Certain Flame-Retardant Fabrics Modified with a Magnetron Sputtering Method

“…The value of SiO 2 /Al/SiO 2 reflection coefficient was 64.97%, for SiO 2 /Al was 57.38%, and for a single Al was 51.59%, respectively. Another example is the study of heat transfer in textile materials sputtered with the aluminum [9]. Four textile substrates were selected for testing: polyester, nylon, cotton blend with 50/50 polyester, and polyurethane with the shape memory.…”

Study on Some Thermal and Electrical Properties of Basalt Fabric Modified with Metal and Ceramics as a Result of Magnetron Sputtering

“…It was found that the sputtering treatment could give significant effects to the heat transfer of nylon without much loss in its shear and bending property, as well as water vapor transmission. The sputtered aluminum fabric was also studied for changes in its heat transfer [16]. Aluminum was applied onto four textile substrates: nylon, polyester, cotton blend with 50/50 polyester, and shape memory polyurethane.…”