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NUMERICAL INVESTIGATION OF HEAT TRANSFER FROM EYE BY THERMAL PLUME AROUND A HUMAN BODY

DOI: 10.1615/ICHMT.2014.IntSympConvHeatMassTransf.600
pages 789-802

Farnaz Feyli
School of Mechanical Engineering, Shiraz University, Shiraz, Iran

Omid Abouali
School of Mechanical Engineering, Shiraz University, Shiraz, Iran

Mahmood A. Yaghoubi
School of Mechanical Engineering, Shiraz University, P. O. Box 71348-51154, Shiraz, Iran; Academy of Science, I.R. Iran

Goodarz Ahmadi
Mechanical and Aeronautical Engineering Department, Clarkson University, Potsdam, NY 13699-5725, USA

Abstract

In this article, a three dimensional manikin in a sufficiently large domain is modeled numerically to study heat removal from the eyes due to natural convection. It is assumed that the movement of surrounding air is only due to buoyancy effect. For simulating the free convection, equations of continuity, momentum, energy and turbulence (k−ε) are solved numerically to find velocity and temperature distributions around the manikin as well as the natural buoyant flow around the head. To verify the accuracy of this approach, the velocity field around the manikin is compared with the experimental data in the literature, which quantified the velocity distribution around a human body using particle image velocimetry (PIV) technique. It is shown that there is a reasonably good agreement between numerical solution and the reference data for velocity profiles over the head region. Using the verified numerical technique, various simulations are performed to predict heat transfer between human eyes and the thermal plume around the body. The heat removal from the eye surface for different ambient air temperatures is then evaluated and results are compared with those from related studies. Results of this study suggest that the present technique is a more comprehensive approach for the assessment of convective heat transfer around the human body than assuming a constant convection coefficient.

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