Experimental study of water evaporation rate, at the surface of aqueous solution, under the effect of a discontinuity of chemical potential – Effect of water activity and air pressure

AbstractWe developed a 3D solar steam generator with the highest evaporation rate reported so far using a carbonized luffa sponge (CLS). The luffa sponge consisted of entangled fibers with a hierarchically porous structure; macropores between fibers, micro-sized pores in the fiber-thickness direction, and microchannels in the fiber-length direction. This structure remained after carbonization and played an important role in water transport. When the CLS was placed in the water, the microchannels in the fiber-length direction transported water to the top surface of the CLS by capillary action, and the micro-sized pores in the fiber-thickness direction delivered water to the entire fiber surface. The water evaporation rate under 1-sun illumination was 3.7 kg/m2/h, which increased to 14.5 kg/m2/h under 2 m/s wind that corresponded to the highest evaporation rate ever reported under the same condition. The high evaporation performance of the CLS was attributed to its hierarchically porous structure. In addition, it was found that the air temperature dropped by 3.6 °C when the wind passed through the CLS because of the absorption of the latent heat of vaporization. The heat absorbed by the CLS during water evaporation was calculated to be 9.7 kW/m2 under 1-sun illumination and 2 m/s wind, which was 10 times higher than the solar energy irradiated on the same area (1 kW/m2).

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An experimental study of the evaporation rate of nanofluid droplets with SiO2 nanoparticles

Journal of Physics Conference Series ◽

10.1088/1742-6596/1675/1/012046 ◽

2020 ◽

Vol 1675 ◽

pp. 012046

Author(s):

E M Bochkareva ◽

N B Miskiv ◽

A D Nazarov ◽

V V Terekhov ◽

V I Terekhov

Keyword(s):

Experimental Study ◽

Evaporation Rate ◽

Sio2 Nanoparticles

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The Effect of Water Activity and theawControlling Solute on Spore Germination ofBacillus stearothermophilus

Journal of Applied Bacteriology ◽

10.1111/j.1365-2672.1981.tb00898.x ◽

1981 ◽

Vol 50 (2) ◽

pp. 335-349 ◽

Cited By ~ 11

Author(s):

G. D. ANAGNOSTOPOULOS ◽

H. S. SIDHU

Keyword(s):

Water Activity ◽

Spore Germination ◽

Effect Of Water ◽

Ofbacillus Stearothermophilus

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Experimental Study on Fire Extinguishing Effect of Water-based Fixed Fire Extinguishing System in full-Scale Bus Cabin

2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE) ◽

10.1109/icfsfpe48751.2019.9055834 ◽

2019 ◽

Author(s):

Yanying Cheng ◽

Chunjie Mou ◽

Ke Chen ◽

Hui Bai ◽

Yu Liu ◽

...

Keyword(s):

Experimental Study ◽

Full Scale ◽

Effect Of Water ◽

Fire Extinguishing ◽

Water Based ◽

Fire Extinguishing System

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Comparison of a Non Electrostatic Surface Complexation Model and Surface Phase Theories for Prediction of Future Sorption Properties.

MRS Proceedings ◽

10.1557/proc-824-cc7.2 ◽

2004 ◽

Vol 824 ◽

Author(s):

Allan T. Emrén ◽

Anna-Maria Jacobsson

Keyword(s):

Aqueous Solution ◽

Chemical Potential ◽

Surface Complexation ◽

Sorption Properties ◽

Phase Method ◽

Detailed Knowledge ◽

Surface Phase ◽

Surface Complexation Model ◽

Advantages And Disadvantages ◽

The One

AbstractIn performance assessments, sorption of radionuclides dissolved in groundwater is mostly handled by the use of fixed Kd values. It has been well known that this approach is unsatisfying. Only during the last few years, however, tools have become available that make it possible to predict the actual Kd value in an aqueous solution that differs from the one in which the sorption properties were measured.One such approach is surface complexation (SC) that gives a detailed knowledge of the sorption properties. In SC, one tries to find what kinds of sorbed species are available on the surface and the thermodynamics for their formation from species in the bulk aqueous solution. Recently, a different approach, surface phase method (SP), has been developed. In SP, a thin layer including the surface is treated as a separate phase. In the bulk aqueous solution, the surface phase is treated as a virtual component, and from the chemical potential of this component, the sorption properties can be found.In the paper, we compare advantages and disadvantages of the two kinds of models. We also investigate the differences in predicted sorption properties of a number of radionuclides (Co, Np, Th and U). Furthermore, we discuss under which circumstances, one approach or the other is preferable.

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Experimental Measurements of the Water Evaporation Rate of a Physical Model

Slovak Journal of Civil Engineering ◽

10.1515/sjce-2017-0003 ◽

2017 ◽

Vol 25 (1) ◽

pp. 19-23 ◽

Cited By ~ 3

Author(s):

Róbert Turza ◽

Belo B. Füri

Keyword(s):

Energy Demand ◽

Evaporation Rate ◽

High Water ◽

Hvac Systems ◽

Swimming Pool ◽

Water Evaporation ◽

Specific Enthalpy ◽

High Water Content ◽

Indoor Environments ◽

Indoor Swimming Pool

Abstract As the number of indoor swimming pools and wellness centers are currently growing, it is necessary to concentrate on the parameters of indoor environments. These parameters are necessary for the design of the HVAC systems that operate these premises. In indoor swimming-pool facilities, the energy demand is large due to ventilation losses from exhaust air. Since water evaporates from a pool’s surface, exhaust air has a high water content and specific enthalpy. In this paper the results of the water evaporation rate measured from swimming pool surfaces at higher thermal water temperatures are described.

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