Estudo comparativo da transferência de calor em dois tipos de tecidos em contato com o corpo humano

• Autor(a) principal: Oliveira, Bruna Arruda de
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Estadual de Maringá (RI-UEM)
• Texto Completo: http://repositorio.uem.br:8080/jspui/handle/1/3602
• topic: Transferência de calor; Tecido; Malha esportiva; Modelagem matemática; Tecidos térmicos; Brasil.; Heat transfer; Mathematical modeling; Sport fabrics; Thermal tissues; Brazil.; Engenharias; Engenharia Mecânica

The advancement of fabric technology used in clothing for running has assisted athletes of all levels to improve their performance. The biggest issue for clothing used by runners is that most fabrics fail to properly evaporate their sweat. Increased humidity in a fabric leads to increases in the rate of sweating which in turn impairs athletic performance. There were two fabrics studied in this test, one was a 100% polyester, a normal fabric provided by the company "Anderson Malhas", and the second was a "thermal fabric" supplied by the company "Aya Tecidos Inteligentes". These tissues were studied with experimental tests with runners for analyzing the effectiveness of each tissue for the transport of heat from the athlete to the external environment. These fabrics were studied with experimental tests with runners at the Laboratory of Physiology of Attempt located in University of Maringá (UEM) and in the Academy of Physical Education in the same institution for comparison between fabrics, in the case of transfer of heat. A simplified mathematical model was developed for the comparison of temperature between the athlete's skin and the environment through the fabrics. The experimental results, discussion of the transient temperature profiles, analysis of the thermal conductivity, the total content of water absorbed by fabric, typical for a climate condition of Maringá-PR, were used evaluate the best type of fabric for the athletes to improve performance. The thermal conductivity obtained to the polyester thermal fabric was kTT = 7,9236.10-4 e(-0,0010.Δx/Tm), with model deviation around 6,39%, and to the polyester usual fabric was kTU = 6,3337.10-4 e(-0,0010.Δx/Tm), and the model deviation around 6,42%. The proposed model was consistent and satisfactory. The proposed model was satisfactory for calculating thermal conductivity of fabrics with composition 100 % polyester.