| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Engblom, Markus
Åbo Akademi University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (7/7 displayed)
- 2024Understanding the crystallization behavior of bioactive glass S53P4 powder compacts under various heating conditionscitations
- 2021Superheater deposits and corrosion in temperature gradient – Laboratory studies into effects of flue gas composition, initial deposit structure, and exposure timecitations
- 2018Experimental and modeling approaches to simulate temperature-gradient induced intradeposit chemical processes with implications for biomass boiler corrosion
- 2017Simultaneous melt and vapor induced ash deposit aging mechanisms – Mathematical model and experimental observationscitations
- 2017The influence of flue gas temperature on lead chloride induced high temperature corrosioncitations
- 2015Alkali chloride transport within superheater deposits due to temperature gradients
- 2014Changes in Composition of Superheater Deposits due to Temperature Gradients
Places of action
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article
Simultaneous melt and vapor induced ash deposit aging mechanisms – Mathematical model and experimental observations
Abstract
<p>A laboratory method was used to study the effects of temperature gradients on synthetic ash deposits consisting of KCl-K2SO4 or NaCl-Na2SO4. The cross-sections of the deposits were analyzed using SEM/EDX. The deposits were observed to form multilayered morphologies, with porous inner layers and dense outer layers. In addition, the outer layer composition was homogenized. The densification and chemical homogenization occurred by liquid-phase sintering and by temperature gradient induced liquid-phase migration. Alkali chlorides were observed to migrate in the gas-phase towards the colder temperatures. The phenomenon was modeled and recognized to be temperature gradient induced Fickian gas-phase concentration diffusion. The migration rate is directly proportional to the temperature gradient and increases exponentially as a function of the absolute temperature. The microstructure of the particle of origin for the gaseous species was observed to function as a crucial limiting factor for the migration rate. The results show that temperature gradients affect the morphology and chemistry of ash deposits and induce alkali chloride migration towards the steel surface.</p>