Numerical study on flow and heat transfer characteristics of low pressure gas in slip flow regime

Xie, Fushou; Li, Yanzhong; Wang, Xing-Bao; Wang, Ying; Lei, Gang; Xing, Kewei

doi:10.1016/j.ijthermalsci.2017.09.022

Cited by 25 publications

(15 citation statements)

References 32 publications

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“…Values for the constants in Equation 7are calculated using a non-linear least-squares fit to the experimental data. No physical justification was given for Equation (7). Data published by Xie et al [6] and a subsequent study by the same group are the only transitionregime hotwire experimental results that the authors are aware of [7].…”

Section: Introductionmentioning

confidence: 99%

“…Extensive theoretical and experimental studies have been conducted for hotwires in the continuum (Kn < 10 −3 ) and slip-flow (10 −3 < Kn < 10 −1 ) regimes [1][2][3][4][5]. Little work has been published that addresses the behavior of hotwires in the transition-regime (10 −1 < Kn < 10 1 ) [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Few numerical simulation investigations of fine-wire heat transfer have been conducted [7,[9][10][11][12]. Çelenligil [12] uses the direct simulation Monte Carlo (DSMC) method to explore heat transfer to cylinders with Kn = 0.02 and 0.2.…”

Section: Introductionmentioning

confidence: 99%

“…Cylinder Re ranged from 0.6 to 24. In Xie et al [7], slip-flow boundary conditions are derived and implemented into the ANYSYS Fluent finite volume computational fluid dynamics (CFD) solver. The study is limited to low wire temperatures relative to the free-stream (T w − T ∞ ≈ 1 • C) to avoid implementing temperature-dependent fluid properties.…”

Section: Introductionmentioning

confidence: 99%

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Low-Speed DSMC Simulations of Hotwire Anemometers at High-Altitude Conditions

Roseman

Argrow

2021

Fluids

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Numerical simulations of hotwire anemometers in low-speed, high-altitude conditions have been carried out using the direct simulation Monte Carlo (DSMC) method. Hotwire instruments are commonly used for in-situ turbulence measurements because of their ability to obtain high spatial and temporal resolution data. Fast time responses are achieved by the wires having small diameters (1–5 μm). Hotwire instruments are currently being used to make in-situ measurements of high-altitude turbulence (20–40 km). At these altitudes, hotwires experience Knudsen number values that lie in the transition-regime between slip-flow and free-molecular flow. This article expands the current knowledge of hotwire anemometers by investigating their behavior in the transition-regime. Challenges involved with simulating hotwires at high Knudsen number and low Reynolds number conditions are discussed. The ability of the DSMC method to simulate hotwires from the free-molecular to slip-flow regimes is demonstrated. Dependence of heat transfer on surface accommodation coefficient is explored and discussed. Simulation results of Nusselt number dependence on Reynolds number show good agreement with experimental data. Magnitude discrepancies are attributed to differences between simulation and experimental conditions, while discrepancies in trend are attributed to finite simulation domain size.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Low-Speed DSMC Simulations of Hotwire Anemometers at High-Altitude Conditions

Roseman

Argrow

2021

Fluids

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“…Abhishek and Agrawal simulated the slip flow in three‐dimensional microtubes with various aspect ratios. Xie et al studied numerically the slip flow behavior for first‐order slip wall conditions. Reis and Dellar provided a numerical study for rarefied compressible gas slip flow using second‐order Maxwell slip boundary conditions in microchannel.…”

Section: Introductionmentioning

confidence: 99%

Gaseous slip flow affected by inclined low magnetic field using second‐order boundary conditions

2019

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In this study, asymptotic solutions of a near continuum gaseous slip flow in two-dimensional rectangular microchannels under the effect of electromagnetic force are presented. An inclined magnetic field was assumed in this study. Nondimensional equations were obtained that relate the pressure ratio, Mach number, magnetic Reynolds number, magnetic force number, and Reynolds number. The asymptotic solutions for the

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