CENTRO NACIONAL DE INVESTIGACIÓN Y

DESARROLLO TECNOLOGICO

Inglés

Catedrático:

Lic. Guadalupe Patricia Armas León

Trabajo Final

“Traducción y Resumen de un Aríiculo”

Presenta:

Erick Iván Téllez Velázquez

2do Semestre

01 de Julio de 2015

A b s t r a c t Traducción del resumen del artículo “Laminar natural convection in a square

cavity: Low Prandtl numbers and large density differences” al español.

Convección natural estable con números pequeños de Prandtl causados por

grandes diferencias de densidad en una cavidad cuadrada calentada a través

de las paredes laterales, se investiga numérica y teóricamente.

Una dimensión adecuada de bajo parámetro caracteriza las diferencias de

densidad del fluido de trabajo que es identifica por el número de Gay –Lussac.

La aproximación de Boussinesq es alcanzada cuando el número Gay -Lussac

tiende a cero. El número Nusselt se deriva para los rangos de número de

Rayleigh 10<Ra< 108, en el número de Prandtl 0.0071< Pr< 7.1 y en el número

de Gay- Lussac 0< Ga < 2. Los efectos de los números de Rayleigh, Prandtl y

Gay - Lussac en el número de Nusselt se discuten por razones físicas por medio

de un análisis de escala. Finalmente, basados en los argumentos físicos, se

propone una correlación de transferencia de calor, válidos para todos los

rangos de números de Prandtl y Gay – Lussac propuestos en este trabajo.

Resumen de la Introducción Se presenta el resumen en inglés de la introducción del artículo antes

mencionado.

Natural convection in cavities has been studied extensively in the literature

because of its relevance to many fields of science and technology, such as

geophysics, nuclear reactor systems, energy storage and smelting processes.

Natural convection in cavities only due to the temperature difference in the

absence of both, heat generation and concentration gradients, three main

configurations have been considered in the literature:

1. Natural convection in horizontal layers through heating of the upper and

lower walls.

2. Heating a lateral initially stratified fluid layer.

3. Natural convection in enclosures heated side walls.

The square cavity has been considered in the literature as the best option for

most cases of convection and to do the validation of the numerical codes of

thermal analysis and physical understanding of natural convection in

enclosures.

The working fluids analyzed in literature are mainly air and water. It can be

concluded from a review of the literature there is a lack of information on the

influence of low and very low numbers Prandtl and large density differences

due to the large temperature differences in heat transfer due to natural

convection.

This paper deals with these latter aspects. The analysis was conducted for the

case of laminar heated in a square cavity flow laterally. The dimensionless

parameter that characterizes the differences in density of the working fluid has

been identified as the number of Gay-Lussac. His influence on the Nusselt

number is derived through its entire physical realm where borderline cases

lead to the Boussinesq approximation and extreme variation respectively

density.

In addition, the influence of Prandtl number on the Nusselt number has been

examined by 0.0071 <Pr <7.1. The number of Rayleigh studied here range from 10-

108.