Enhanced solar evaporation of water from porous media, through capillary mediated forces and surface treatment

Canbazoglu, F. M.; Fan, Bei; Kargar, Ali Reza; Vemuri, Krishna P.; Bandaru, Prabhakar R.

doi:10.1063/1.4961945

Cited by 33 publications

(23 citation statements)

References 24 publications

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“…The pore sizes of fabricated membranes are of primary interest because the pores are the driveway paths in which evaporation flux occurs. Moreover, it has been reported in the literature that a higher rate of mass transfer occurs at the edges of the pores rather than their middle regions, as suggested by the perimeter effect phenomenon [3,4], suggesting that smaller pore sizes can drive a higher rate of evaporation, as shown in the literature via mathematical modeling approaches [31].…”

Section: The Impact Of Fs Blending On the Membrane Propertiesmentioning

confidence: 98%

Effect of Pore Characteristics in Polyvinylidene Fluoride/Fumed Silica Membranes on Mass Flux in Solar-Assisted Evaporation Applications

et al. 2019

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Although important, very little has been demonstrated in the literature to experimentally demonstrate the effects of porosities and pore size on the evaporation flux in polymeric membranes. Additionally, we suspect that a batch-mode setup, i.e., stagnant water, could cause a build-up of heat in the system, influencing the evaporation mass-flux mechanism, and jeopardizing the ability to attain a real correlation between evaporation and effects of pore characteristics. Herein, we fabricate polyvinylidene fluoride membranes containing variable amounts of a Fumed Silica additive to achieve membranes with variable properties, and we investigate the change in the performance of the solar-assisted thin-film evaporation utilizing an in-house built continuous flow evaporation setup (to avoid heat build-up effects in the bulk of the water and demonstrate a continuous flow system). Our membrane design approach had two important advantages: (1) the achievement of similar heat transfer and solar absorbance properties and (2) the achievement of variable pore sizes and volume porosities. We show that the mass flux increased as the mean pore size decreased, indicating that the mode of mass transfer occurred due to the thin-film region of the meniscus from the small fluid velocities near the interface, and we attribute the results to the increase in the capillary pumping effects through the mesoporous channels as they get thinner.

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Section: The Impact Of Fs Blending On the Membrane Propertiesmentioning

confidence: 98%

Effect of Pore Characteristics in Polyvinylidene Fluoride/Fumed Silica Membranes on Mass Flux in Solar-Assisted Evaporation Applications

et al. 2019

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“…Optimizing the proper amount of water supply is very important. Hydrophilic [46,49,100] or hydrophobic [59,65,101], pore size and coupling with other physics-assisted enhancement etc. have great impacts on the water transport and the efficiency of water vapor generation.…”

Section: Mass Transfermentioning

confidence: 99%

Photothermal materials for efficient solar powered steam generation

Liu

Lai

Zhao

et al. 2019

Front. Chem. Sci. Eng.

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Solar powered steam generation is an emerging area in the field of energy harvest and sustainable technologies. The nano-structured photothermal materials are able to harvest energy from the full solar spectrum and convert it to heat with high efficiency. Moreover, the materials and structures for heat management as well as the mass transportation are also brought to the forefront. Several groups have reported their materials and structures as solutions for high performance devices, a few creatively coupled other physical fields with solar energy to achieve even better results. This paper provides a systematic review on the recent developments in photothermal nanomaterial discovery, material selection, structural design and mass/heat management, as well as their applications in seawater desalination and fresh water production from waste water with free solar energy. It also discusses current technical challenges and likely future developments. This article will help to stimulate novel ideas and new designs for the photothermal materials, towards efficient, low cost practical solar-driven clean water production.

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“…Recently, Canbazoglu et al [81] presented enhanced solar evaporation of water in porous media, through capillary mediated forces and surface treatment. Generally, in solar evaporation involving porous media, there are several variables that govern the efficiency via the throughput and conversion of the liquid water to water vapor.…”

Section: Liquid Propagationmentioning

confidence: 99%

Novel Receiver-Enhanced Solar Vapor Generation: Review and Perspectives

Raza

Alzaim

et al. 2018

Energies

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Efficient solar vapor/steam generation is important for various applications ranging from power generation, cooling, desalination systems to compact and portable devices like drinking water purification and sterilization units. However, conventional solar steam generation techniques usually rely on costly and cumbersome optical concentration systems and have relatively low efficiency due to bulk heating of the entire liquid volume. Recently, by incorporating novel light harvesting receivers, a new class of solar steam generation systems has emerged with high vapor generation efficiency. They are categorized in two research streams: volumetric and floating solar receivers. In this paper, we review the basic principles of these solar receivers, the mechanism involving from light absorption to the vapor generation, and the associated challenges. We also highlight the two routes to produce high temperature steam using optical and thermal concentration. Finally, we propose a scalable approach to efficiently harvest solar energy using a semi-spectrally selective absorber with near-perfect visible light absorption and low thermal emittance. Our proposed approach represents a new development in thermally concentrated solar distillation systems, which is also cost-effective and easy to fabricate for rapid industrial deployment.

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Enhanced solar evaporation of water from porous media, through capillary mediated forces and surface treatment

Cited by 33 publications

References 24 publications

Effect of Pore Characteristics in Polyvinylidene Fluoride/Fumed Silica Membranes on Mass Flux in Solar-Assisted Evaporation Applications

Effect of Pore Characteristics in Polyvinylidene Fluoride/Fumed Silica Membranes on Mass Flux in Solar-Assisted Evaporation Applications

Photothermal materials for efficient solar powered steam generation

Novel Receiver-Enhanced Solar Vapor Generation: Review and Perspectives

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