Instability Modes and Scaling Analysis During Electro-Hydro-Dynamic-Atomization: Theoretical and Experimental Study

IF 2 3区工程技术 Q3 MECHANICS

Flow, Turbulence and Combustion Pub Date : 2024-07-15 DOI:10.1007/s10494-024-00567-x

Alok Kumar Ray

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Abstract

The electro-hydro-dynamic-atomization (EHDA) is a well-established technology with numerous micro/nanoparticle fabrication applications. However, a consistent method for explaining the physics behind the process has yet to be established. The present study aims to report a comprehensive non-dimensional analysis to develop a correlation between different process parameters. The dimensionless numbers derived from Buckingham’s pi theorem match well with those derived from the Navier–Stokes equation, establishing the forces involved in EHDA. Flow instability modes during the EHDA process are experimentally visualized using the flow visualization technique and characterized using a microscope. The instability modes are described using derived non-dimension numbers, and results closely align with Ganan-Calvo’s findings. Derived scaling for the current is in good agreement with Ganan-Calvo (1997), which complies with the condition if δ_μ × (Q/Qo)^1/3 > > 1, then I/Io = 11 × (Q/Qo)^1/4 -5. Moreover, the ratio of ln (Ehd)/ ln (Md) in cone jet mode is found to be ≈2, irrespective of fluids.

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电流体动力原子化过程中的不稳定模式和缩放分析：理论与实验研究

电流体动力原子化（EHDA）是一项成熟的技术，在微/纳米粒子制造方面应用广泛。然而，解释该过程背后物理学原理的一致方法尚未建立。本研究旨在报告一项全面的非维度分析，以建立不同工艺参数之间的相关性。从白金汉π定理推导出的无量纲数与纳维-斯托克斯方程推导出的无量纲数非常吻合，从而确定了 EHDA 所涉及的力。使用流动可视化技术对 EHDA 过程中的流动不稳定模式进行了实验可视化，并使用显微镜对其进行了表征。不稳定模式使用推导出的非维度数进行描述，结果与 Ganan-Calvo 的发现非常吻合。推导出的电流缩放与 Ganan-Calvo（1997 年）的结果非常一致，如果 δμ × (Q/Qo)1/3 > > 1，则 I/Io = 11 × (Q/Qo)1/4 -5。此外，在锥形喷流模式中，无论流体如何，ln (Ehd)/ ln (Md) 之比均为≈2。

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来源期刊

Flow, Turbulence and Combustion 工程技术-力学

CiteScore

5.70

自引率

8.30%

发文量

审稿时长

2 months

期刊介绍： Flow, Turbulence and Combustion provides a global forum for the publication of original and innovative research results that contribute to the solution of fundamental and applied problems encountered in single-phase, multi-phase and reacting flows, in both idealized and real systems. The scope of coverage encompasses topics in fluid dynamics, scalar transport, multi-physics interactions and flow control. From time to time the journal publishes Special or Theme Issues featuring invited articles. Contributions may report research that falls within the broad spectrum of analytical, computational and experimental methods. This includes research conducted in academia, industry and a variety of environmental and geophysical sectors. Turbulence, transition and associated phenomena are expected to play a significant role in the majority of studies reported, although non-turbulent flows, typical of those in micro-devices, would be regarded as falling within the scope covered. The emphasis is on originality, timeliness, quality and thematic fit, as exemplified by the title of the journal and the qualifications described above. Relevance to real-world problems and industrial applications are regarded as strengths.