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
Wetting: statics and dynamics
TL;DR: In this paper, the authors present an attempt towards a unified picture with special emphasis on certain features of "dry spreading": (a) the final state of a spreading droplet need not be a monomolecular film; (b) the spreading drop is surrounded by a precursor film, where most of the available free energy is spent; and (c) polymer melts may slip on the solid and belong to a separate dynamical class, conceptually related to the spreading of superfluids.
Journal ArticleDOI
Drop Impact Dynamics: Splashing, Spreading, Receding, Bouncing ...
TL;DR: In this article, a review deals with drop impacts on thin liquid layers and dry surfaces, referred to as splashing, and their propagation is discussed in detail, as well as some additional kindred, albeit nonsplashing, phenomena like drop spreading and deposition, receding (recoil), jetting, fingering, and rebound.
Journal ArticleDOI
Wetting: Statics and dynamics
TL;DR: In this article, experimental studies of wetting phenomena have helped to bridge the gap between the progress made in theory and simulation over the past decade, and the experimental evidence or verification of the theoretical predictions.
Journal ArticleDOI
Capillary effects during droplet impact on a solid surface
TL;DR: In this article, a numerical solution of the Navier-Stokes equation using a modified SOLA-VOF method was used to model the impact of water droplets on a flat, solid surface using both experiments and numerical simulation.
Journal ArticleDOI
On the collision of a droplet with a solid surface
Sanjeev Chandra,C.T. Avedisian +1 more
TL;DR: In this paper, the collision dynamics of a liquid droplet on a solid metallic surface were studied using a flash photographic method, which provided clear images of the droplet structure during the deformation process.
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