The study is concerned with the heat and moisture transport in a ventilated fabric-skin system composed of a microclimate air annulus that separates an outer cylindrical fabric boundary and an inner oscillating cylinder representing human skin boundary for open and closed aperture settings at the ends of the cylindrical system. The cylinder ventilation model of Ghaddar et al. (2005, Int. J. Heat Mass Transfer, 48(15), pp. 3151–3166) is modified to incorporate the heat and moisture transport from the skin when contact with fabric occurs at repetitive finite intervals during the motion cycle. During fabric skin contact, the heat and moisture transports are modeled based on the fabric dry and evaporative resistances at the localized touch regions at the top and bottom of points of the cylinder. Experiments were conducted to measure the mass transfer coefficient at the skin to the air annulus under periodic ventilation and to measure the sensible heat loss from the inner cylinder for the two cases of fabric-skin contact and no contact. The model predictions of time-averaged steady-periodic sensible heat loss agreed well with the experimentally measured values at different frequencies. The model results showed that the rate of heat loss increased with increased ventilation frequency at fixed (=amplitude/mean annular spacing). At amplitude factor of 1.4, the latent heat loss in the contact region increased by almost 40% compared to the loss at amplitude factor of 0.8 due to the increase in fabric temperature during contact. The sensible heat loss decreased slightly between 3% at $f=60rpm$ and 5% at $f=25rpm$ in the contact region due to higher air temperature and lack of heat loss by radiation when fabric and skin are in touch. The presence of an open aperture has a limited effect on increasing the total heat loss. For an open aperture system at amplitude factor of 1.4, the increase in heat loss over the closed apertures is 4.4%, 2.8%, and 2.2% at $f=25$, 40, and $60rpm$, respectively.

1.
,
N.
,
Ghali
,
K.
,
Harathani
,
J.
, and
Jaroudi
,
E.
, 2005, “
Ventilation Rates of Micro-climate Air Annulus of the Clothing-skin System Under Periodic Motion
,”
Int. J. Heat Mass Transfer
0017-9310,
48
(
15
), pp.
3151
3166
.
2.
,
N.
,
Ghali
,
K.
, and
Harathani
,
J.
, 2005, “
Modulated Air Layer Heat and Moisture Transport by Ventilation and Diffusion From Clothing With Open Aperture
,”
ASME J. Heat Transfer
0022-1481,
127
(
3
), pp.
287
297
.
3.
Harter
,
K. L.
,
Spivak
,
S. M.
, and
Vigo
,
T. L.
, 1981, “
Applications of the Trace Gas Technique in Clothing Comfort
,”
Text. Res. J.
0040-5175,
51
, pp.
345
355
.
4.
Lotens
,
W.
, 1993, “
Heat Transfer From Humans Wearing Clothing
,” doctoral thesis, TNO Institute for Perception, Soesterberg, The Netherlands, pp.
34
37
.
5.
Danielsson
,
U.
, 1993, “
Convection Coefficients in Clothing Air Layers
,” Ph.D. thesis, The Royal Institute of Technology, Stockholm.
6.
Havenith
,
G.
,
Heus
,
R.
, and
Lotens
,
W. A.
, 1990, “
Resultant Clothing Insulation: a Function of Body Movement, Posture, Wind Clothing Fit and Ensemble Thickness
,”
Ergonomics
0014-0139,
33
(
1
), pp.
67
84
.
7.
Jones
,
B. W.
,
Ito
,
M.
, and
McCullough
,
E. A.
, 1990, “
Transient Thermal Response Systems
,”
Proceedings of the 4th International Conference on Environmental Ergonomics
, Austin, TX, October 2–4, pp.
66
67
.
8.
Jones
,
B. W.
, and
McCullough
,
E. A.
, 1985, “
Computer Modeling for Estimation of Clothing Insulation
,”
Proceedings of CLIMA 2000
,
World Congress on Heating, Ventilating, and Air Conditioning
, Copenhagen, Denmark, August 25–30, Vol.
4
, pp.
1
5
.
9.
Ghali
,
K.
,
,
N.
, and
Jones
,
B.
, 2002, “
Multi-Layer Three-Node Model of Convective Transport Within Cotton Fibrous Medium
,”
J. Porous Media
1091-028X,
5
(
1
), pp.
17
31
.
10.
Ghali
,
K.
,
,
N.
, and
Jones
,
B.
, 2002, “
Modeling of Heat and Moisture Transport by Periodic Ventilation of Thin Cotton Fibrous Media
,”
Int. J. Heat Mass Transfer
0017-9310,
45
, pp.
3703
3714
.
11.
,
N.
,
Ghali
,
K.
, and
Harathani
,
J.
, 2005, “
Modulated Air Layer Heat and Moisture Transport by Ventilation and Diffusion From Clothing With Open Aperture
,”
ASME J. Heat Transfer
0022-1481,
127
(
3
), pp.
287
297
.
12.
Womersley
,
J. R.
, 1955, “
Oscillatory Motion of Viscous Liquid in Thin-walled Elastic Tube: I. The Linear Approximation for Long Waves
,”
Philos. Mag.
0031-8086,
46
, pp.
199
221
.
13.
Lamoreux
,
L. W.
, 1971, “
Kinematic Measurements in the Study of Human Walking
,”
Bull. Prosthet. Res.
0007-506X, pp.
3
86
.
14.
Farnsworth
,
B.
, 1986, “
A Numerical Model of Combined Diffusion of Heat and Water Vapor Through Clothing
,”
Text. Res. J.
0040-5175,
56
, pp.
653
655
.
15.
Jones
,
B. W.
, and
Ogawa
,
Y.
, 1992, “
Transient Interaction Between the Human and the Thermal Environment
,”
ASHRAE Trans.
0001-2505,
98
(
1
), pp.
189
195
.
16.
Hyland
,
R. W.
, and
Wexler
,
A.
, 1983, “
Formulations for the Thermodynamic Properties of the Saturated Phases of H2O From 173.15K to 473.15K
,”
ASHRAE Trans.
0001-2505,
89
(
2A
), pp.
500
519
.
17.
ASHRAE
, 1993,
Handbook of Fundamentals
,
American Society of Heating, Refrigerating and Air conditioning Engineers
, Atlanta, GA.
18.
Kerslake
,
D. McK.
, 1972,
The Stress of Hot Environments
,
Cambridge University Press
, Cambridge.
19.
Mochida
,
T.
, 1970, “
Convective and Radiative Heat Transfer Coefficients for the Human Body
,”
Bulletin of the Faculty of Engineering
,
, pp.
1
11
.
20.
,
N.
,
Ghali
,
K.
, and
Jones
,
B.
, 2003, “
Integrated Human-Clothing System Model for Estimating the Effect of Walking on Clothing Insulation
,”
Int. J. Therm. Sci.
1290-0729,
42
(
6
), pp.
605
619
.