Langmuir–Maxwell and Langmuir–Smoluchowski boundary conditions for thermal gas flow simulations in hypersonic aerodynamics

Le, Nam T. P.; White, Craig; Reese, Jason M.; Myong, R.S.

doi:10.1016/j.ijheatmasstransfer.2012.04.050

Cited by 43 publications

(54 citation statements)

References 13 publications

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“…Maxwellian definition can be used for calculation of the molecular mean free path λ (Le et al, 2012), but for the VHS collision model the molecular mean free path can be calculated as follows (Bird, 1994)…”

Section: Ns Solvermentioning

confidence: 99%

Study of the effects of preheated wall/plates in microthruster systems

Lekzian

Parhizkar

Ebrahimi

2018

jtam

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In the present paper, effects of pre-heated walls/plates on microthrusters performance are studied using a DSMC/NS solver. Three microthruster configuration types are studied. Type 1 is a cold gas microthrster. Microthruster type 2 has pre-heated walls. Pre-heated plates are inserted inside the chamber of microthruster type 3. It is observed that in microthruster type 2 the flow is accelerated and the specific impulse is elevated. However, by insertion of the pre-heated plates in microthruster type 3, viscous effects have stronger negative influence and the thrust is decreased. By implementing temperature gradients on walls in type 2 and on plates in type 3, it is observed that a higher temperature gradient enhances performance parameters of microthruters. Among all types of microthrusters, microthruster type 2 with pre-heated walls has the highest thrust and specific impulse. Microthruster type 3 with a temperature gradient of 300-500 K has the minimum thrust due to a considerable decrease in the mass flow rate.

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Section: Ns Solvermentioning

confidence: 99%

Study of the effects of preheated wall/plates in microthruster systems

Lekzian

Parhizkar

Ebrahimi

2018

jtam

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“…The implemented approach of nonequilibrium boundary condition was described in our previous work [5,7]. The Maxwell slip condition with the curvature effect will be used for all CFD simulations.…”

Section: New Temperature Jump Condition In Cfdmentioning

confidence: 99%

New temperature jump boundary condition in high-speed rarefied gas flow simulations

Loc

et al. 2017

Vietnam J. Mech.

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Abstract. The effect of the sliding friction has been important in calculating the heat flux of gas flow from the surface since there is some slip over the surface. There has not been any the temperature jump condition including the sliding friction part so far. In this paper, we will propose a new temperature jump condition that includes the sliding friction. Our new temperature jump condition will be evaluated for NACA0012 micro-airfoil in highspeed rarefied gas flow simulations using the CFD method, which solves the NavierStokes equations within the OpenFOAM framework with working gas as air. The airfoil case is simulated with various Knudsen numbers from 0.026 to 0.26, and the angles-ofattack (AOAs) from 0-deg to 20-deg. The surface gas temperatures predicting by our new temperature jump condition give good agreements with the DSMC data, especially the NACA0012 micro-airfoil cases with the high Knudsen numbers, Kn = 0.1, and Kn = 0.26 with AOA = 20-deg. for the lower surface.

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“…The hybrid conditions such as the Langmuir-Maxwell (LM) and Langmuir-Smoluchowski (LS) conditions were proposed by Le et al [25] by inserting the Langmuir adsorption isotherm [3,29] into the Maxwell and Smoluchowski (MS) equations. They assumed that only diffuse reflection and perfect energy exchange are taken into account for developing these hybrid slip/jump conditions (i.e.…”

Section: Computational Fluid Dynamics (Cfd)mentioning

confidence: 99%

“…The hybrid slip and jump conditions were presented in Ref. [25] as follows: (6) which the right hand side of the hybrid slip condition also contains three terms that are associated with (in order): the surface velocity, the so-called curvature effect [23], and thermal creep. The hybrid jump condition is 7The fraction of coverage is computed by the Langmuir adsorption isotherm [3,29].…”

Section: Computational Fluid Dynamics (Cfd)mentioning

confidence: 99%

“…The Maxwell slip velocity [23] and the Smoluchowski temperature jump [24] boundary conditions for CFD are revisited in the present work. Recently, Le et al [25] proposed the Langmuir-Maxwell and Langmuir-Smoluchowski boundary conditions, so-called "hybrid boundary conditions", for rarefied gas simulation by combining the Langmuir adsorption isotherm and kinetic theory. These hybrid conditions are investigated in the present study for a flow with separation and reattachments.…”

Section: Introductionmentioning

confidence: 99%

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