Abstract
Abstract The protective clothing packages, which protect the human body against hot factors in a foundry are in continuous development to increase their resistance and comfort of use. The problem of heat transfer through textiles is the active field of research and reliable numerical modeling of this process can be helpful to design high-quality protective products. Therefore, the numerical model of heat transfer through the package based on the aluminized basalt fabric was developed. The macroscopic geometry of weft and warp threads was reproduced in agreement with samples of plain weave basalt fabric. Mapping the stochastically distributed individual monofilaments in basalt threads, as well as modeling the heat transfer between them, was impossible at the microscopic level. Therefore, the weft and warp threads were modeled as a porous material with a homogeneous distribution of basalt and air in their structure. Data from measurements of the bare and aluminized basalt fabrics by the Alambeta device were used to determine the model parameters. The model was used to simulate the heat transfer through the protective package composed of the aluminized basalt fabric, wool clothing, and cotton underwear. A good agreement of model results was found for measurement results in such a package. The presented procedure allowed for the determination of the main thermal properties of tested basalt fabrics.
Highlights
Foundry workers can be identified as one of many professions, where employees are exposed to hot factors
To develop a reliable numerical model of the textile package, the dedicated simulations were performed to determine the apparent heat transfer coefficients (HTCs) of porous basalt fabric
Another set of simulations were carried out to determine the thermal conductivity of adhesive mean used in the aluminized basalt fabric
Summary
Foundry workers can be identified as one of many professions, where employees are exposed to hot factors. Workers involved in the melting metal process are subjected directly to high and variable temperatures, flames as well as molten metal splashes. In most plants, many secondary hazards have been minimized or eliminated, but the high temperature and splashes of molten metal cannot be eliminated during this specific work [1]. Operating next to the foundry furnace, discharge of molten metals and slags can be hazardous to foundry workers’ health, and because of this there has been a surge in demand in the protective clothing [2]. Characteristic features of glass fibers are their non-flammability and high heat resistance. Their strength increases sligthly for temperaturę above 200°C, around 300°C further, more intense strength growth is observed, while a sharp decrease takes place, if 600°C is exceeded. The developed technologies of glass fiber production allow for a good resistance of products made of these fibers to short-term exposure to a very high temperature and expand the boundary of resistance to long-term heat effects [3,4,5]
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