Splashing of a gasoline-camellia oil droplet impacting its thin film on heated wall: Crown evolution

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-05-17 DOI:10.1016/j.powtec.2025.121113

Guanqing Wang , Yan Cui , Zhiyu Li , Enhua Zheng , Lu Wang , Tao Wang , Jiangrong Xu

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引用次数: 0

Abstract

Biomass oil is increasingly recognized as a sustainable energy resource due to its low net carbon emissions, high energy density, and renewable properties. In the process of its atomization during combustion, oil droplet impact on heated wall is crucial. However, understanding the mixed fuel droplet impact on heated walls and splashing behavior remains insufficient. This study experimentally investigated the splashing behavior of a gasoline-camellia oil (GCO) droplet impacting its thin film on a heated wall, focusing on the crown evolution and its transition regimes to splashing. Its morphologies along with spreading velocities are characterized by considering the effects of Weber number (We), Ohnesorge number (Oh) and wall temperature. The transition regimes of crown morphology are further characterized in three typical diagrams. The results show that diameter evolution of the crown exhibits two patterns depending on its rupture, whereas its height evolution shows three distinct scenarios. A concise prediction correlation for spreading velocity was derived using a multiple power law function involving We and Oh. Morphology transition of the crown exhibits five typical patterns with distinct regular distribution in their respective diagrams, signifying the critical transition thresholds between them. These results provide a morphological basis for further investigation into the heat and mass transfer mechanisms involved in the process, thereby facilitating the effective utilization of biomass oil as a substitute for gasoline.

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汽油-山茶油滴在加热壁上冲击其薄膜的飞溅：树冠演化

由于其低净碳排放、高能量密度和可再生特性，生物质油越来越被认为是一种可持续能源。在燃烧雾化过程中，油滴对受热壁面的冲击至关重要。然而，对混合燃料液滴对加热壁面的影响和飞溅行为的了解仍然不够充分。实验研究了汽油-山茶油（GCO）液滴在加热壁面上撞击其薄膜时的飞溅行为，重点研究了其树冠演化及其向飞溅过渡的机制。考虑了韦伯数（We）、奥内乔治数（Oh）和壁温的影响，表征了其形貌随扩散速度的变化。在三个典型图中进一步描述了树冠形态的转变机制。结果表明，冠的直径演化随冠的破裂呈现两种模式，冠的高度演化呈现三种不同的模式。利用包含We和Oh的多重幂律函数导出了传播速度的简明预测相关性。树冠形态转变呈现出5种典型模式，它们在各自的图中有明显的规律分布，表明了它们之间的临界过渡阈值。这些结果为进一步研究该过程中的传热传质机制提供了形态学基础，从而促进了生物质油作为汽油替代品的有效利用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.