The effect of wetting characteristics, thermophysical properties, and roughness on spray-wall heat transfer in selective catalytic reduction systems

Schweigert, David; Damson, B.; Lüders, Hartmut; Stephan, Peter; Deutschmann, Olaf

doi:10.1016/j.ijheatmasstransfer.2020.119554

Cited by 13 publications

(3 citation statements)

References 34 publications

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“…The latter is confirmed by reports of enhanced heat transfer in the nucleate boiling regime, also causing secondary droplets to be expelled through bubble explosion much sooner after contact than on a smooth surface [10]. No consistent dependency of spray-induced heat transfer on surface roughness could be shown in [29], which was attributed to other additional influencing factors, e.g., the introduction of surface contaminants from surface treatment.…”

Section: Influence Of Surface Roughness On Droplet Impingementmentioning

confidence: 55%

Impact of Surface Roughness on the Impingement of Urea–Water Solution Droplets

Quissek

Lauer

2023

Fluids

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The understanding of impingement processes is crucial for optimizing automotive selective catalytic reduction (SCR) systems. An accurate description of this behavior helps design exhaust systems and increases the validity of modeling approaches. A component test bench was set up, featuring a droplet chain generator for producing droplet sizes typically found in the urea–water solution sprays of SCR systems. A heatable impingement plate with an interchangeable surface enabled investigation of the influence of surface roughness. Data were acquired using a high-speed camera and image postprocessing. The droplet–wall interaction could be described using different regimes. An approach to characterizing impingement behavior based on weighted-regime superposition enabled gradual transitions between regimes, instead of step-like changes. It was observed that the surface roughness increased the droplet–solid contact area and generated thermal-induced secondary droplets at lower temperatures. A region of enhanced mechanical disintegration of the droplet was found, caused by peaks of the surface shearing off parts of the droplet. The probability of a droplet rebounding from the wall was reduced on a rough surface, due to the interference of the surface spikes with the droplet’s spreading and contracting motion. Additionally, the influence of surface topography was investigated using a shot-peened surface. Caused by this surface’s reduced root mean square slope, the aforementioned enhancement of mechanical disintegration was not observed.

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Section: Influence Of Surface Roughness On Droplet Impingementmentioning

confidence: 55%

Impact of Surface Roughness on the Impingement of Urea–Water Solution Droplets

Quissek

Lauer

2023

Fluids

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“…Therefore, a relatively low T LF should be chosen for fabrication. The substrate material, 27,40,41 surface roughness, 25,42,43 and physical properties 29,44 of the droplets have a great impact on T LF . When the substrate possesses a rather low thermal conductivity, the heat transfer from the surrounding solid area to the solid−liquid contact area is relatively weak, leading to a deviation of the boiling temperature.…”

Section: Determination Of Fabrication Conditionsmentioning

confidence: 99%

Highly Efficient and Controlled Fabrication of Supraparticles by Leidenfrost Phenomenon

Liu

Liu²,

Jy³

et al. 2022

Langmuir

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Supraparticles (SPs) are agglomerates of smaller particles, which show promising applications in catalysis, sensing, and so forth. Preparation of SPs with controlled sizes, components, and structures in an efficient, scalable, and environmentally friendly way has become an urgent demand for the development of SPs. Herein, a method to fabricate SPs based on the Leidenfrost phenomenon is described. By dropping a nano-/ microparticle dispersion on a metal plate at the Leidenfrost temperature (T LF ) or higher, the solvent evaporates quickly, and SPs can be formed within 1 min. To understand the influence of various factors on the properties of SPs, and also to optimize the fabrication of SPs, the effects of metal surface roughness and primary particle concentration on T LF were carefully observed. Plates with a higher roughness as well as a higher primary particle concentration could trigger a lower T LF . Combining the regulation of composition and volume of the droplets, SPs with different sizes, compositions, and structures were precisely fabricated. Furthermore, highly porous titanium dioxide (TiO 2 ) SPs with enhanced photocatalytic performance were fabricated via this method, showing the merits of the method in practical applications. This simple, efficient, and green method provides a new approach for controlled and large-scale fabrication of SPs with various functions.

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“…Roughness is also the only way to access hydrophobic and hydrophilic surfaces [13; 14]. A large number of studies have been devoted to studying the effect of the physicochemical properties of the surface on the adhesion between a material and steel, which induces the formation of relatively strong acidbase interactions [20].…”

Section: Introductionmentioning

confidence: 99%

Вплив Шорсткості На Фізико-Хімічні Властивості Сталі А36: Дослідження Адгезії Фосфатів

Наджіх,

Адар,

Медкур

et al. 2023

J. of Chem. and Tech.

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У цій роботі обговорюється вплив шорсткості поверхні та фізико-хімічних властивостей поверхні на початкову адгезію фосфатів до сталі. Зразки сталі, використані в цьому дослідженні, виготовлені з низьколегованої сталі A36. Фосфат був видобутий в районі Бен-Гурір-Марокко і в цій роботі використовувався у вигляді гранул, спресованих під різними тисками. Сталеву поверхню обробляли двома методами попередньої обробки поверхні – хонінгуванням та горизонтальним фрезеруванням. Досліджено вплив цих процедур на морфологію поверхні, шорсткість, поверхневу енергію та гідрофобність. Вимірюючи кут контакту на поверхнях фосфатних гранул і підкладок з низьколегованої сталі А36, ми змогли визначити деякі фізико-хімічні параметри та розрахувавши поверхневу енергію. Крім того, шорсткість кожного сталевого зразка була досліджена за допомогою вимірювача шорсткості та металургійного мікроскопа. Отримані результати показали, що фосфатована поверхня піддається впливу дисперсійних сил і має гідрофільний характер. Для поверхонь різних підкладок зі сталі А36 добре досліджено вплив шорсткості, отримано мінімальну поверхневу енергію як для попередньої обробки (хонінгування та горизонтального фрезерування), так і для визначеної шорсткості. Цей результат може бути використаний для підготовки поверхонь з мінімальною поверхневою енергією для мінімізації енергії руйнування і, отже, мінімізації адгезії та засмічення фосфатами сталі.

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The effect of wetting characteristics, thermophysical properties, and roughness on spray-wall heat transfer in selective catalytic reduction systems

Cited by 13 publications

References 34 publications

Impact of Surface Roughness on the Impingement of Urea–Water Solution Droplets

Impact of Surface Roughness on the Impingement of Urea–Water Solution Droplets

Highly Efficient and Controlled Fabrication of Supraparticles by Leidenfrost Phenomenon

Вплив Шорсткості На Фізико-Хімічні Властивості Сталі А36: Дослідження Адгезії Фосфатів

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