Abstract
This paper investigates the influence of low-pressure glow plasma water treatment on boiling phenomenon. The presented results show the novel influence and potential new applications of low-pressure glow plasma treated water. Low-pressure glow plasma water treatment affects some of its physical properties such as surface tension, pH, and electric conductivity; this is due to changes in the water structure. An experimental analysis aimed to investigate the effect of such a treatment on the boiling heat transfer coefficient of water, and to assess the stability of GPTW. The experiments were carried out at atmospheric and reduced pressure for heat fluxes up to 70 kW/m2. The analysis shows significant deterioration of the boiling heat transfer coefficient under reduced pressure. In addition, the plasma treatment process had no significant effect on the thermal conductivity of water, as confirmed experimentally. A slight increase was observed, but it was within the measuring error range of the instruments used.
Highlights
The phenomenon of boiling plays a vital role in various branches of industry
All samples were subjected to thermal conductivity tests
An examination of the boiling process of glow plasma treated water (GPTW) at normal pressure showed that the heat transfer coefficient (HTC) for the analyzed fluids was very similar in the entire heat flux density range
Summary
The phenomenon of boiling plays a vital role in various branches of industry. The effects on the boiling process have various parameters, related to the properties of the boiling liquid, the characteristics of the heating surface, and the way these interact. A more detailed description will allow more precise predictions to be made of the thermal effects associated with this phenomenon This will, in turn, make it possible to optimize the design process and operation of equipment and systems using boiling of working substances. Each of the natural refrigerants has some advantages and disadvantages: hydrocarbons have flammable properties, ammonia is a highly toxic, carbon dioxide has a relatively low heat of evaporation and high working pressures, and water has a very high boiling point at normal pressure. All of these working fluids have unique advantages, due to their thermodynamic and physical properties, availability, or price
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