Study on the heat and mass transfer in air-bubbling enhanced vacuum membrane distillation

Wu, Chunrui; Li, Zhengang; Zhang, Jianhua; Jia, Yongzhong; Gao, Qijun; Lu, Xiaolong

doi:10.1016/j.desal.2015.07.001

Cited by 43 publications

(9 citation statements)

References 45 publications

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“…First, the air-covered areas still experience evaporation at the air-water interface similar to that at the air-water interface in MD membrane pores. Additionally, vapor transport may be improved by enhanced local agitation, reduced salt/surfactant deposition/adhesion on the membrane surface/pores, and reduced temperature and concentration polarization effects in the feed-membrane boundary layers [58]. Finally, the concentration factor and water recovery were considerably affected by wetting (Fig.…”

Section: Effect Of Membrane Superhydrophobicity With Mesh Spacer and mentioning

confidence: 99%

Wetting prevention in membrane distillation through superhydrophobicity and recharging an air layer on the membrane surface

Rezaei

Warsinger

Lienhard

et al. 2017

Journal of Membrane Science

126

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Although membrane distillation offers distinctive benefits in some certain areas, i.e., RO concentrate treatment, concentrating solutions in the food industry and solar heat utilization, the occurrence of wetting of the hydrophobic membrane hinders its potential industrial applications.Therefore, wetting prevention is a vital criterion for the treatment of solutions with lower surface tension than water. The present work examines the effect of recharging air bubbles on the membrane surface for the wetting incidence when a surfactant (sodium dodecyl sulfate, SDS) exists in a highly concentrated NaCl aqueous solution. This study shows that the presence of the air bubbles on the surface of the superhydrophobic membrane in a direct contact membrane distillation setup inhibited the occurrence of wetting (~100% salt rejection) even for high concentrations of the surface-active species (up to 0.8 mM SDS) in the feed solution while no undesirable influence on the permeate flux was observed. Introducing air into the feed side of the membrane displaces the liquid which partly tends to penetrate the macroporous structure with air bubbles and therefore increases the liquid entry pressure, and in addition, the simultaneous use of a superhydrophobic membrane enhances the solution contact angle.

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Section: Effect Of Membrane Superhydrophobicity With Mesh Spacer and mentioning

confidence: 99%

Wetting prevention in membrane distillation through superhydrophobicity and recharging an air layer on the membrane surface

Rezaei

Warsinger

Lienhard

et al. 2017

Journal of Membrane Science

126

View full text Add to dashboard Cite

show abstract

“…where Q in is the heat input from the external thermostat, kJ, C p is specific heat of hot feed, kJ / (kg ·°C), Q is the flow rate of hot feed, L/h, T 1 and T 4 are the temperature of the hot feed inlet and the cold feed outlet, respectively,°C, and ΔH is the evaporation enthalpy of the hot feed that can be calculated by [29], kJ/kg:…”

Section: Performance Of Agmd Processmentioning

confidence: 99%

Study on the performance of double-pipe air gap membrane distillation module

Liu

Gao

et al. 2016

Desalination

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“…Ahmed et al [26] had developed an evacuated tube solar desalination system; they had studied the multistage characteristics of ETC in solar distillation. Wu et al [27] have made an effective study on the heat and mass transfer in vacuum membrane distillation based on air bubbling, whereas Jahangiri et al [28] had performed an experiment using solar energy to assess the performance of thermosyphon heat pipes as well as vacuum glass. Dwivedi and Tiwari [29] conducted a comparison study on internal heat transfer coefficients in a passive solar still by different thermal models.…”

Section: Introductionmentioning

confidence: 99%

Effect of Reflecting Material on CPC to Improve the Performance of Hybrid Groundwater Solar Desalination System

Kedar

Bewoor²,

Murali

et al. 2021

International Journal of Photoenergy

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Water-energy nexus is a crucial and challenging concern that addressing it is noteworthy for the future of human beings. In addition, freshwater production is a highly energy-intensive procedure. Therefore, developing a suitable solution for this problem is of importance. In the present scenario, solar energy is one of the suitable options for desalination because solar energy is available at a low cost, is clean for the environment, and is widely available. Generally, solar collectors such as flat plate collectors (FPC) and evacuated tube collectors were experimented for desalination applications. This work presents an experimental investigation of a single-stage hybrid (ETC-CPC) groundwater solar desalination system. A compound parabolic concentrator (CPC) is placed below the evacuated tube collector (ETC) for collecting solar radiations to transfer heat to evacuated tubes which improves performance in the case of different weather conditions of Pune city in India. Experimental results show that the hybrid solar groundwater desalination system, by maintaining the optimum distance of 20 mm between ETC and CPC with Mylar as the reflecting material, could offer a drinking water production rate of up to 3.4 l/(m2h)/day. However, the proposed single-stage hybrid (ETC+CPC) groundwater solar desalination system with aluminum foil as a reflecting material could generate 1.9 liters of soft water per day. Further, the use of Mylar as a reflecting material could generate 3.5 liters of soft water per day.

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Study on the heat and mass transfer in air-bubbling enhanced vacuum membrane distillation

Cited by 43 publications

References 45 publications

Wetting prevention in membrane distillation through superhydrophobicity and recharging an air layer on the membrane surface

Wetting prevention in membrane distillation through superhydrophobicity and recharging an air layer on the membrane surface

Study on the performance of double-pipe air gap membrane distillation module

Effect of Reflecting Material on CPC to Improve the Performance of Hybrid Groundwater Solar Desalination System

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