Journal ArticleDOI
Role of Bouncing Potential in Molten Ash Impaction
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TLDR
In this article, the authors developed a model to predict the outcome of a molten ash particle impacting a heat transfer surface, where the main driving force for a splat at maximum spread state to recoil is the difference in surface energies of the splat and its equilibrium sessile drop state.Abstract:
The aim of the present study is to develop a model to predict the outcome of a molten ash particle impacting a heat-transfer surface. The main driving force for a splat at maximum spread state to recoil is the difference in surface energies of the splat and its equilibrium sessile drop state. If the difference in surface energies is significant, a vigorous recoiling then leads to rebounding. During the travel from splat to equilibrium state, the viscous dissipation in the rim opposes the recoiling process. By overcoming the dissipation loss, the splat reaches sessile drop state. If the drop possesses energy greater than the adhesion energy, it will detach itself from the surface; otherwise, it will deposit. A bouncing potential model based on this concept is derived and compared with models and experimental data in literature.read more
Citations
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Journal ArticleDOI
Modeling of ash formation and deposition processes in coal and biomass fired boilers: A comprehensive review
Yongtie Cai,Kun Lin Tay,Zhimin Zheng,Wenming Yang,Hui Wang,Guang Zeng,Zhiwang Li,Siah Keng Boon,Prabakaran Subbaiah +8 more
TL;DR: In this article, a comprehensive review on the development of the modelling of ash deposition with particle combustion, sticking, rebound and removal behaviors is presented, including the modeling of ash deposit morphomology.
Journal ArticleDOI
Mechanistic modeling, numerical simulation and validation of slag-layer growth in a coal-fired boiler
TL;DR: In this paper, a mechanistic bouncing potential model, incorporating the phenomenon of recoiling of molten ash droplets after impaction, is employed to determine the outcome of slag-layer impaction.
Journal ArticleDOI
Ultrasonic coal washing to leach alkali elements from coals.
TL;DR: Ulasonic water-washing and chemical-washing, in comparison with agitation, are studied in order to estimate the intensification of the alkali removal process by sonication.
Journal ArticleDOI
Mechanistic Model for Ash Deposit Formation in Biomass Suspension Firing. Part 1: Model Verification by Use of Entrained Flow Reactor Experiments
TL;DR: In this article, two models for deposit formation in suspension firing of biomass have been developed: model #1 employs a reference viscosity in the description of the sticking probability, while model #2 combines impaction of viscoelastic particles on a solid surface with particle capture by a viscous surface.
Journal ArticleDOI
Influence of Chemical Leaching on Rheology and Ash Reduction of Indian Coal
TL;DR: The quality and calorific value of Indian coal are very low. as discussed by the authors The objective of the present study was to reduce the ash content and to produce ultraclean coal (UCC).
References
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Journal ArticleDOI
Submodel for Predicting Slag Deposition Formation in Slagging Gasification Systems
TL;DR: In a slagging combustion system, some of ash/slag generated through the combustion of solid fuels is molten and adheres to tube surfaces or the refractory wall during operation.
Journal ArticleDOI
Asymptotic analysis of the dewetting rim
Jacco H. Snoeijer,Jens Eggers +1 more
TL;DR: This work calculates the shape of the rim as well as the speed of the front using lubrication theory and employs asymptotic matching between the contact line region, the rim, and the film.
Journal ArticleDOI
Retraction phenomena of surfactant solution drops upon impact on a solid substrate of low surface energy
TL;DR: In this article, the impact of surfactant solutions drop on a low-surface-energy solid substrate is investigated using a high-speed photographic technique (one picture every 100 μs) which allows simultaneous top and side views.
Journal ArticleDOI
Dewetting of thin polymer films near the glass transition.
TL;DR: This work analyzes the profile of the dewetting film, and characterize the time evolution of the dry region radius, R(d)(t), and of the rim height, h(m)(t).
Journal ArticleDOI
The bursting of soap films
TL;DR: In this article, a photographic technique for the study of spontaneous bursting of soap films is described, based on submicrosecond flash photography triggered by the burst itself, which is similar to spark-initiated bursting studied previously but originates always at the margin of the film.
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