<p>In this study, a sensitivity numerical analysis of turbulence parameters based on Reynolds Averaged Navier–Stokes (RANS) equations has been conducted to model the heat and mass transfer in the cross flow transport membrane condenser (TMC) based heat exchanger. The heat exchanger under investigation is designed to recover both sensible and latent heat due to transport of heat and mass through a nanoporous ceramic membrane in the bundle of tubes of the heat exchanger. The RNG k-ε two-equation turbulence model was used to model the turbulent flow of the flue gas mixture. The condensation rate of the water vapor from the flue gas were calculated using a mixed condensation model. The mixed model is based on the capillary condensation and wall condensation in the membrane tube. The numerical study were focused on the investigation of the impact of the turbulent intensity of the flue gas at various inlet conditions, such as Reynolds numbers and temperatures, &nbsp;on the heat and mass transfer mechanism inside the TMC and pressure drop characteristics The numerical results are validated against the experimental results reported in the literature. The preliminary results showed that an increase in turbulent intensity leads to a significant increase on the condensation rate and a slight change on the pressure drop in the heat exchanger. &nbsp;In addition, the effects of inlet flow velocity and temperature profiles on the heat and mass transfer were also presented and discussed.</p>

Influence of Flue Gas Turbulence Intensity on the Heat and Mass Transfer and Pressure Drop Inside a Tmc Based Heat Exchanger

Paper Proceedings: https://asmedigitalcollection.asme.org/HT/HT2021/volume/84874

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