**Greek symbols**


#### **Subscripts**

338 Mass Transfer - Advanced Aspects

3. Under the experimental conditions of the present study, the effect of the porosity of the

4. The effect of pore diameter on the moisture transport depends on the pore diameter and the plate thickness. That is, the smaller the pore diameter and the thicker the plate,

5. The effect of the channel height on the moisture transport depends on the thermal conductivity of the porous plate. For the low-thermal-conductivity plate, the moisture transport increased when channel height varied from 1.5 mm to 1.0 mm, and the moisture transport varied little when the channel height varied from 1.0 mm to 0.5 mm. However, for the high-thermal-conductivity plate, the moisture transport increased when the channel height varied from 1.5 mm to 1.0 mm and from 1.0 mm to 0.5 mm. Thus, for highly efficient moisture recovery, a compact device is preferable, provided

This project supported by the National Natural Science Foundation of China (Grant No.

porous plate on the performance of moisture transport was not significant.

transfer at the surface of porous plate.

that the pressure drop ends in a limited range.

)

the greater the effect.

**5. Acknowledgements** 

**6. Nomenclature** 

*K D* (, ) ε

50876076) and Nissan Motor Co. Ltd.

*d* absolute humidity (g/kg'

 permeability (m2) *L* channel length (m) *M* mass flux (kg/(m2s)) Δ*P* pressure drop (Pa) *q* heat flux (W/m2)

*Rfp* moisture transport resistance (1/m)

*Rtp* thermal resistance (m2K/W)

*V* air volumetric flow (m3/s) Δ*x* thickness of porous plate (m)

moisture absorption rate

*<sup>p</sup>* thermal conductivity (W/(mK))

*RH* relative humidity *v* air velocity (m/s)

**Greek symbols** 

porosity

viscosity (Pa.s)

contact angle

ε

η

λ

μ

θ

*D* pore diameter (μm) *De* equivalent diameter (m) *gl h* latent heat (kJ/kg)

thermal resistance inside the porous plate for the low-thermal-conductivity plate; whereas, for the high-thermal-conductivity plate the controlling factor is the heat

