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TECHNICAL BRIEFS

# Optimal Molar Gas Composition of Selected Gas Mixtures With Helium that Maximize Turbulent Free Convection Along Vertical Plates

[+] Author and Article Information
Antonio Campo1

Department of Mechanical Engineering, The University of Vermont, Burlington, VT 05405acampo@cems.uvm.edu

Salah Chikh

Départment de Génie Mécanique, USTHB, B.P. 32, El Alia, Bab Ezzoaur 16111, Algeria

Shyam S. Sablani

Department of Bioresource and Agricultural Engineering, Sultan Qaboos University, Al-Khod PC 123, Muscat, Oman

1

Corresponding author.

J. Fluids Eng 128(1), 199-201 (Jul 13, 2005) (3 pages) doi:10.1115/1.2137349 History: Received May 18, 2004; Revised July 13, 2005

## Abstract

With the goal of intensifying turbulent free convection from heated vertical plates to cold gases, five binary gas mixtures are examined in this technical note. Helium (He) is chosen as the principal gas while xenon (Xe), nitrogen $(N2)$, oxygen $(O2)$, carbon dioxide $(CO2)$, and methane $(CH4)$ are the companion gases. From thermal physics, the thermophysical properties affecting turbulent free convection of binary gas mixtures are the viscosity $μmix$, the thermal conductivity $λmix$, the density $ρmix$, and the heat capacity at constant pressure $Cp,mix$. Invoking the similarity variable transformation, the system of two nonlinear differential equations is solved numerically by the shooting method and a fourth-order Runge-Kutta-Fehlberg algorithm. From the numerical temperature fields, the allied mean convection coefficients $h¯mix∕B$ changing with the molar gas composition $w$ in the $w$ domain [0, 1] are plotted in congruous diagrams for the five binary gas mixtures under study.

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## Figures

Figure 1

Variation of the allied mean convection coefficient h¯mix∕B with the molar gas composition w for the five binary gas mixtures at a film temperature of 300K

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