The model development and case study for transient thermal response of the human body interacting with the coupled fabric-environment system

Shih, Shih-Hao; Shih, Yen‐Ping; Wang, Li-Chu; Shiah, Sheau-Wen; Hu, Shih−Cheng

doi:10.1016/j.csite.2020.100592

Cited by 5 publications

(3 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During the heat transfer process of the gaseous phase, the transfer of the gaseous phase involves the diffusion of water vapor in the air and moisture convection, the convection–diffusion equation in the transient regime for the gaseous phase is expressed as follows 44 where c v is the water vapor concentration (mol/m 3 ), Jtrue→ is the water vapor diffusion flux (mol·m −2 ·s −1 ), utrue→g is the convection velocity of the gaseous phase (moisture, m/s), and R is the universal gas constant (m 3 ·Pa·mol −1 ·K −1 ).…”

Section: Methodsmentioning

confidence: 99%

“…When water vapor (as a solute) diffuses in the air (as a solvent), according to the equations (14) and (15), even for saturated water vapor ( c vsat : 2.194 mol/m, 3 at 308.15 K), the molar coefficient of water vapor ( X v ) is only 0.055, while the molar coefficient of air ( X a ) is as high as 0.945, indicating that the content of water vapor in the air is extremely low, and the gaseous phase is a dilute substance.…”

Section: Methodsmentioning

confidence: 99%

“…1,2 The heat transfer performance adjusts the heat dissipation efficiency of human body, thereby maintaining the body temperature balance. 3 The transmission characteristics of water vapor adjust the transmission rate of sweat on the skin surface and improve the evaporation and heat dissipation of sweat. 4 The thermal comfort of the fabric is usually characterized by experimental tests of water vapor resistance ( R et ) and water vapor permeability ( W d ), 5,6 which reflects the heat convection and water vapor transmission.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Simulation of coupled transient heat and water vapor transfer in porous fiber membrane with different fiber orientations and porosity

Gao

et al. 2021

Journal of Industrial Textiles

View full text Add to dashboard Cite

The transfer process of heat and water vapor in a porous fiber membrane was investigated through the simulation of a 3D model for optimizing the configuration design. 3D models with different fiber orientations and porosity were constructed by the parameter input method, and the accuracy of the model was validated by the coefficient of determination (R2) between the apparent velocity of the model and the air permeability of the membrane. The permeability of 3D model was used to reflect the discrepancy in fiber orientation of the model. The influences of fiber orientation and porosity on heat and water vapor transfer were surveyed by the coupled physics of heat transfer and dilute substance transfer. Since there was no temperature difference in the entire domain, heat conduction (10−9 W/m2) and moisture convection (10−14 mol·m−2·s−1) were faint in the model. With the diffusion of water vapor in the moisture, the heat convection flux and water vapor diffusion flux gradually decreased and reached equilibrium. When the permeability was increased by adjusting the fiber orientation (from 1.002 to 1.200 m2), the heat convection flux and water vapor diffusion flux followed a similar growth pattern due to the coupling effect of heat transfer and water vapor transfer. The R2 for the heat convection flux and water vapor transmission rate of the simulations and experiments with different porosity (44.87, 47.64 and 50.15%) were 0.999 and 0.923, respectively, which demonstrated the validation of the simulation in heat and water vapor transfer.

show abstract