Transonic, supersonic, and hypersonic flow of rarefied gas into vacuum through channels with a forward- or backward-facing step

IF 2.3 4区 工程技术 Q2 INSTRUMENTS & INSTRUMENTATION
O. Sazhin, A. Sazhin
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Abstract

Numerical investigations of high-speed rarefied gas outflow into a vacuum through channels with a forward- or backward-facing step have been conducted using the direct simulation Monte Carlo method. Calculations have been performed for various free-stream Mach numbers, covering transonic, supersonic, and hypersonic flow regimes, and over a wide range of gas rarefaction from free molecular to near hydrodynamic conditions. Mass flow rates through the channel and the gas flow field have been accurately calculated both inside the channel and in the regions upstream and downstream. It has been established that channel geometry, the free-stream velocity, and gas rarefaction strongly influence the gas flow. In the flow field, in front of the channel, a phenomenon known as a detached shock occurs, while inside the channel, a gas recirculation zone may form.

Abstract Image

稀薄气体以跨音速、超音速和高超音速流经带有前向或后向台阶的通道进入真空
采用直接模拟蒙特卡罗方法,对高速稀薄气体通过具有前向或后向阶梯的通道流出真空进行了数值研究。计算针对各种自由流马赫数,包括跨音速、超音速和高超音速流动状态,以及从自由分子到接近流体力学条件的广泛气体稀释范围。通过通道的质量流量和气体流场在通道内部以及上下游区域都得到了精确计算。研究证实,通道的几何形状、自由流速度和气体稀释对气体流动有很大影响。在流场中,通道前方会出现一种被称为分离冲击的现象,而通道内部则可能形成气体再循环区。
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来源期刊
Microfluidics and Nanofluidics
Microfluidics and Nanofluidics 工程技术-纳米科技
CiteScore
4.80
自引率
3.60%
发文量
97
审稿时长
2 months
期刊介绍: Microfluidics and Nanofluidics is an international peer-reviewed journal that aims to publish papers in all aspects of microfluidics, nanofluidics and lab-on-a-chip science and technology. The objectives of the journal are to (1) provide an overview of the current state of the research and development in microfluidics, nanofluidics and lab-on-a-chip devices, (2) improve the fundamental understanding of microfluidic and nanofluidic phenomena, and (3) discuss applications of microfluidics, nanofluidics and lab-on-a-chip devices. Topics covered in this journal include: 1.000 Fundamental principles of micro- and nanoscale phenomena like, flow, mass transport and reactions 3.000 Theoretical models and numerical simulation with experimental and/or analytical proof 4.000 Novel measurement & characterization technologies 5.000 Devices (actuators and sensors) 6.000 New unit-operations for dedicated microfluidic platforms 7.000 Lab-on-a-Chip applications 8.000 Microfabrication technologies and materials Please note, Microfluidics and Nanofluidics does not publish manuscripts studying pure microscale heat transfer since there are many journals that cover this field of research (Journal of Heat Transfer, Journal of Heat and Mass Transfer, Journal of Heat and Fluid Flow, etc.).
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