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TECHNICAL PAPERS: Heat and Mass Transfer

Modulated Air Layer Heat and Moisture Transport by Ventilation and Diffusion From Clothing With Open Aperture

[+] Author and Article Information
Nesreen Ghaddar, Jihad Harathani

American University of Beirut, Beirut, Lebanon

Kamel Ghali

Beirut Arab University, Beirut, Lebanon

J. Heat Transfer 127(3), 287-297 (Mar 24, 2005) (11 pages) doi:10.1115/1.1857949 History: Received January 09, 2004; Revised December 13, 2004; Online March 24, 2005
Copyright © 2005 by ASME
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References

Figures

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Schematic representation of the air mass balance on element of thickness dx
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Computational grid system
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The variation with time of the internal modulated air layer parallel flow rate and normal mass flux (a) ṁax and (b) ṁay, respectively, at x=0.2 L, 0.4 L, 0.6 L, 0.8 L and L using the presented Womersley model for the parallel flow at the frequency of 25 rpm, CD=1,Ym=38.1 mm, and ΔY=6.35 mm
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The variation of the Womersley and Poisueille models time-averaged mass flow rates with x at three different ventilation frequencies of 15, 25, and 35 rpm for CD=1,Ym=38.1 mm, and ΔY=6.35 mm
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The fabric space-averaged regain as a function of time for the both the Womersley and Poiseuille 2D models of parallel flow (open aperture), and the 1D normal flow model (closed aperture)
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The variation in time of (a) the internal air layer temperature at x=0.4, 0.6 L, 0.8 L and L, at f=25 rpm and CD=1, and for the 1D normal flow model at f=25 rpm, (b) the 2D space-averaged internal air layer temperature over the length L and 1D normal flow model f=25 rpm, and (c) the 2D space-averaged humidity ratios of the 2D and 1D models at f=25 rpm
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The Womersley-based 2D model time-averaged (a) sensible and (b) latent heat losses from the skin in Watt/m2 as a function of x at three different ventilation frequencies of 15, 25, and 35 rpm for CD=1,Ym=38.1 mm and ΔY=6.35 mm. The Poisueille-based 2D model at f=25 rpm is also shown.
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The parallel Womersley flow model time-averaged (a) sensible and (b) latent heat losses from the skin in W/m2 as a function of x
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The predicted fabric regain using ventilation model for the conditions of Ghali et al. experiment 1 at various air flow rates from zero to 0.05242 kg/m2 ⋅s. On the same graph, the diffusion model regain in still air is shown.
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Schematic of the physical domain of (a) the fabric-air layer-skin system; (b) the fabric model, and (c) the variation in time of the ratio of air layer thickness to the air layer mean thickness

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