Pressure effect on the release of supercooled water with dissolved air

Lee, Dong Gyu; Park, Chunwan; Jeong, Sang‐Ho; Kang, Chang-Ho

doi:10.1016/j.ijrefrig.2013.09.029

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…Turbidity was determined by the nephelometric method (Turbidity meter with sample cell: HACH Model—2100P) (Shukla et al., 2013). The Azide modification of the Winkler method was used to determine the amount of DO in each sample (Donggyu et al., 2014). The hydrazine reduction method (APHA, 2005) was used to determine the amount of nitrate‐nitrogen in each sample.…”

Section: Study Area Materials and Methodsmentioning

confidence: 99%

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Spatial variation of the Akosombo hydroelectric power dam and its effects on downstream water quality, people and living organisms

Gbedemah,

Andoh,

Adanu

2023

Lakes & Reservoirs

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The Akosombo Hydroelectric Power Plant (AHPP) is one of the largest man‐made lakes in the world. The impact of the dam after its construction on living organisms and people is not known. This paper offers new insights into our understanding of how the lake affects water quality for living organisms and people living downstream of its tailrace at different spatial levels. Water samples were collected to determine physicochemical and bacteriological parameters at fifteen strategically chosen sampling points. The data were analysed in the laboratory for certain physicochemical and biological parameters. About 95 questionnaires were also administered at Abume to households to ascertain their concerns with the water from the dam. The results indicated that the operation of AHPP has statistically significant effects on pH, Dissolved Oxygen (DO), faecal coliform and total coliform. The DO and total coliform did not rejuvenate by the 1km tailrace distance of the study. However, pH rejuvenated at a distance of 750 meters. The people also point out that the quality of the river at Abume is not safe for drinking and living organisms. The study concludes that water from the AHPP downstream is a satisfactory source of raw water that can be treated for domestic use. The water can also not support large fish species like tilapia. The study recommends that cage fishing should not take place close to the tailrace. The Volta River Authority and the government should provide potable drinking water to the communities affected by the construction of the dam and new sustainable turbines should be employed to manage the dam.

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Section: Study Area Materials and Methodsmentioning

confidence: 99%

“…The Azide modification of the Winkler method was used to determine the amount of DO in each sample (Donggyu et al, 2014). The hydrazine reduction method (APHA, 2005) was used to determine the amount of nitrate-nitrogen in each sample.…”

Section: Water Sampling Proceduresmentioning

confidence: 99%

Spatial variation of the Akosombo hydroelectric power dam and its effects on downstream water quality, people and living organisms

Gbedemah,

Andoh,

Adanu

2023

Lakes & Reservoirs

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Kinetic study on electro-nucleation of water in a heterogeneous propane nano-bubble system to form polycrystalline ice I c

Ghaani

English

2020

The Journal of Chemical Physics

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Elucidating the underlying mechanisms of water solidification in heterogeneous systems is crucially important for a panoply of applications; gaining such an understanding has also proven to be very challenging to the community. Indeed, one such example lies in clarifying the thermodynamics and kinetics of electro-crystallization in heterogeneous systems, such as micro- and nano-bubble systems. Here, we employ non-equilibrium molecular dynamics of water in heterogeneous environments experiencing direct contact with a propane gas phase at various temperatures in externally applied static electric fields, elucidating significant external-field effects in inducing poly-crystalline cubic-ice formation. This is in stark contrast with recent work on homogeneous cubic-ice electro-nucleation to produce largely fault-free single crystals. We explore the kinetics of heterogeneous cubic-ice electro-nucleation under different field intensities and thermal conditions and provide an overview of time-dependent dynamics of evolution of polycrystallinity.

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Effects of Nanostructure Additives on Supercooling and Freezing of Distilled Water

Lee¹,

Kim²,

Dong

2020

Int. J. Air-Cond. Ref.

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The phenomenon of supercooling, which prevents freezing of water below the freezing point, is an obstacle to the production of inexpensive ice. In the case of ice heat storage systems using bio-preservation, low-temperature refrigeration of food and ice capsules in the HVAC industry, the supercooled water in capsules that indirectly come into contact with the outside is one of the problems that must be solved to maintain energy costs and the quality of food or organs. To improve this, experimental evaluation of additives that serve as crude nuclear agents is needed. However, research on this area needs to be supported because the types of additives are limited and their physical properties are unstable. In this paper, the effect of distilled water containing an additive of average diameter nanometer size on solution (frozen) supercooled below the freezing point was investigated. The supercooling time and supercooling level of each specimen were analyzed after addition of kaolin, strontium hydroxide, oxidizing mineral and nano-sized single-wall carbon nanotubes (SWCNT) as mineral fine particles in the distilled water. As a result, it has been confirmed that kaolin and SWCNT can be used as nuclear materials to release supercooling of water. In addition, when kaolin, a mineral fine particle, is used as a nuclear material, its size affects the performance of nuclearization. This confirmed the impact of nuclear material particle size and structure on overcooled emissions.

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Pressure effect on the release of supercooled water with dissolved air

Cited by 3 publications

References 21 publications

Spatial variation of the Akosombo hydroelectric power dam and its effects on downstream water quality, people and living organisms

Spatial variation of the Akosombo hydroelectric power dam and its effects on downstream water quality, people and living organisms

Kinetic study on electro-nucleation of water in a heterogeneous propane nano-bubble system to form polycrystalline ice I c

Effects of Nanostructure Additives on Supercooling and Freezing of Distilled Water

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