determinação de propriedades térmicas de grãos de milho determination of corn thermal properties
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ID: 166792
2004
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Abstract
Realizou-se este trabalho com o objetivo de determinar a massa específica, condutividade térmica, difusividade térmica e calor específico de grãos de milho, em função do teor de água do produto. Na determinação da condutividade e da difusividade térmicas, foi usado o método do cilindro infinito dotado de uma fonte de calor linear central. Para tal, foi construído um equipamento que consistiu de um tubo de alumínio (0,1 m de diâmetro e 0,5 m de altura) isolado nas extremidades superior e inferior. Para funcionar como fonte linear de calor, instalou-se no centro do cilindro (na direção longitudinal) um fio resistor de níquel-cromo envernizado (resistência, aproximada, 4,16 W.m-1), com diâmetro de 0,0006438 m. Durante cada determinação, o fio resistor foi submetido a uma diferença de potencial de 2,08V (fonte alimentadora de tensão e voltagem), que proporcionou uma corrente elétrica de 1A. O teor de água das amostras testadas variou de 8,6 a 17,1% b.u. O comportamento dos valores de condutividade térmica, difusividade térmica e calor específico em função do teor de água no produto pode ser representados por relações lineares. A condutividade térmica e o calor específico dos grãos aumentaram com o teor de água do produto, enquanto a difusividade térmica diminuiu. Erros envolvidos nas determinações das propriedades térmicas são também discutidos neste trabalho.
Values for bulk density, thermal conductivity, thermal diffusivity and specific heat of corn grains were obtained in this work as a function of product moisture content. The infinite cylinder method with a central heat source was used in the thermal conductivity and diffusivity determinations. The equipment used consisted of an aluminum tube (0.1m of diameter and 0.5m of height) isolated in the superior and inferior extremities. A resistor (nickel-chrome; strength of 4.16 W.m-1; diameter of 0.0006438m) was used as a heat source that was located at the center of the cylinder (longitudinal direction). During each determination, the resistor was submitted to a difference of potential of 2.08V that provided an electric current of 1A. The moisture content of the tested samples varied from 8.6 to 17.1% w.b. The behavior of the values of thermal conductivity, diffusivity and specific heat as a function of the product moisture content can be represented by linear relationships. The thermal conductivity and specific heat of the grains increase with the product moisture content, while the thermal diffusivity decreases. Errors involved in the thermal properties determinations are also discussed in this work.
Values for bulk density, thermal conductivity, thermal diffusivity and specific heat of corn grains were obtained in this work as a function of product moisture content. The infinite cylinder method with a central heat source was used in the thermal conductivity and diffusivity determinations. The equipment used consisted of an aluminum tube (0.1m of diameter and 0.5m of height) isolated in the superior and inferior extremities. A resistor (nickel-chrome; strength of 4.16 W.m-1; diameter of 0.0006438m) was used as a heat source that was located at the center of the cylinder (longitudinal direction). During each determination, the resistor was submitted to a difference of potential of 2.08V that provided an electric current of 1A. The moisture content of the tested samples varied from 8.6 to 17.1% w.b. The behavior of the values of thermal conductivity, diffusivity and specific heat as a function of the product moisture content can be represented by linear relationships. The thermal conductivity and specific heat of the grains increase with the product moisture content, while the thermal diffusivity decreases. Errors involved in the thermal properties determinations are also discussed in this work.
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andrade2004cinciadeterminao
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| Authors | ;Ednilton Tavares de Andrade;Sandra Maria Couto;Daniel Marçal de Queiroz;Abraão Brito Peixoto |
| Journal | information and software technology |
| Year | 2004 |
| DOI |
10.1590/S1413-70542004000300002
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