Advanced models of fuel droplet heating and evaporation

https://web.ics.purdue.edu/~lqiao/Publications_files/Combustion%20characteristics%20of%20fuel%20droplets%20with%20addition%20of%20nano%20and%20micron-sized%20aluminum%20particles.pdf

Combustion characteristics of fuel droplets with addition of nano and micron-sized aluminum particles

There is an acknowledged growing need for efficient and sustainable systems that use available energy resources in an “optimal” (including constraints) way. Such a goal cannot be effectively achieved without taking into account the limits posed by the second law of thermodynamics. A possible approach consists in the so-called entropy generation analysis, which possesses key features making it more attractive than traditional energy balance approaches. In fact, entropy generation analysis allows for a direct identification of the causes of inefficiency and opens up the possibility for designers to conceive globally more effective systems. Furthermore, thanks to its direct derivation from basic thermodynamic principles, entropy generation analysis can be in principle used for any type of energy conversion system. These attractive features have made entropy generation analysis a popular thermodynamic method for the design and the optimization of less unsustainable systems. This paper presents a critical review of contributions to the theory and application of entropy generation analysis to different types of engineering systems. The focus of the work is only on contributions oriented toward the use of entropy generation analysis as a tool for the design and optimization of engineering systems. A detailed derivation of the existing entropy generation formulations is first presented, and the two more popular approaches are discussed: the entropy generation minimization (EGM) and the entropy generation analysis (EGA). The relevant literature is further classified in two categories, depending on whether the level of the analysis is global or local. This review will further clarify the use of entropy generation-based design methods, indicate the areas for future work, and provide the necessary information for further research in the development of efficient engineering systems.

Entropy generation analysis as a design tool - A review

Three-dimensional numerical analysis of PEM fuel cells with straight and wave-like gas flow fields channels

Nowadays wastewater zero emission in power plants has attracted great attention in the world. This paper describes the recent progress in the cooling of flue gas by the evaporation of desulfurization wastewater. The desulfurization wastewater slurry is mixed with pressurized compression air, and then sprayed into flue gas duct between the air pre-heater and electro-static precipitator or separated evaporation tower, to evaporate the wastewater instantaneously using the exhausted heat of flue gas. This process can reduce water consumption in flue gas desulfurization, cut down the traditional disposing expense consumed in desulfurization wastewater treatment, and reduce gypsum rain discharged from stack etc. This paper summarizes the negative impacts due to the omission of gas–gas heater (GGH) and the difficulties in desulfurization wastewater treatment in current power plants, and also points out that desulfurization wastewater evaporation technology is an important way to achieve zero emission of desulfurization wastewater or other high salt concentration wastewater and solve the problems related to omitting GGH. The instant regulation and control mechanism involved in desulfurization wastewater, migration and transformation rules of desulfurization wastewater and other key problems to be solved are also mentioned respectively. Hopefully, through multidisciplinary researches, evaporation treatment technology for desulfurization wastewater or other high salt concentration wastewater in coal-fired power plants will become mature and be applied widely in near future.

Research on desulfurization wastewater evaporation: Present and future perspectives

Effects of gravity and ambient pressure on liquid fuel droplet evaporation

https://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1003&context=mechengcombust

Daniel N. Pope

Papers

Effects of gravity and ambient pressure on liquid fuel droplet evaporation

Numerical simulation of fuel droplet extinction due to forced convection

Surface tension effects during low-Reynolds-number methanol droplet combustion

Effects of the ambient temperature and initial diameter in droplet combustion

Numerical study of Marangoni convection during transient evaporation of two-component droplet under forced convective environment