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Experimental study on differences of heat and mass flux on opposite side of a 10-nm nanoporous ceramic membrane tube

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Abstract

A nanoporous ceramic membrane tube (CMT) is able to extract water vapor and latent heat from gas mixture, such as flue gas exhausted from thermal power plant, because of its excellent permselectivity and heat-exchange capacity. However, due to the effect of the gravity force on condensation film formation and condensate permeation process, the water and heat-recovery performance on top and bottom parts of a horizontal CMT may be distinct. In this study, a corresponding experiment was performed to verify and research the phenomenon by installing six equidistant and symmetrical measuring points at top and bottom parts of the experimental CMT module, respectively. According to the experimental data, the local temperature of cooling water on top (Tc,l,t) and bottom (Tc,l,b) parts of CMT module exhibited a distinct changing tendency, and the maximum temperature difference (ΔTc) could approach 2.68 °C. Typically, the effects of gravity force on condensation film was negligible, while the permeation capacity of condensate was influenced by gravity force apparently. Moreover, most of condensate (92.24% maximally) was generated during the normal condensation process, merely a small proportion of condensate was produced by the capillary condensation process. This paper is useful for horizontal membrane type gas-water technology improvement.

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Abbreviations

h :

Heat transfer coefficient(W/m2.°C)

T :

Temperature(°C)

d :

Inner diameter(m)

Q :

Heat flux(kW)

U :

Velocity(m/s)

c p :

Specific isobaric heat capacity (kJ/kg.°C)

L :

length of ceramic membrane tube(m)

M :

Mass flux (kg/s)

m :

Weight (kg)

g :

Gravity acceleration(m/s2)

W :

Efficiency

w :

Water-recovery rate (kg/m2.h)

t :

Experimental time(s)

x :

x-coordinate (mm)

all :

Overall

in :

Inlet

out :

Outlet

l :

Local

lat :

Latent heat

sat :

Saturated state

rec :

Water recovery

per :

Water permeation

cap :

Capillary condensation

wall :

Wall surface of ceramic membrane tube

r :

Residual condensation liquid film

n :

Normal condensation

con :

Condensation

f :

Feed gas side

c :

Cooling water side

top :

Top part of the module

bot :

Bottom part of the module

b :

Bulk temperature (velocity) of feed gas

δ :

Thickness (mm)

λ :

Thermal conductivity(W/m.°C)

γ :

Latent heat (kJ/kg)

μ :

Dynamic viscosity (Pa.s)

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Funding

This study was funded by the National Key R&D Program of China (grant number 2018YFB0604302).

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Correspondence to Boran Yang.

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The authors declare that they have no conflict of interest. This article does not contain any studies performed by any of the authors. Informed consent was obtained from all individual participants included in the study.

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Chen, H., Yang, B., Ye, C. et al. Experimental study on differences of heat and mass flux on opposite side of a 10-nm nanoporous ceramic membrane tube. Heat Mass Transfer 56, 219–237 (2020). https://doi.org/10.1007/s00231-019-02711-0

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  • DOI: https://doi.org/10.1007/s00231-019-02711-0

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