Drag measurements of cones in the rarefied flow regime.

AIAA Journal ◽  
1967 ◽  
Vol 5 (10) ◽  
pp. 1901-1902
Author(s):  
M. I. KUSSOY
Keyword(s):  
Flow Regime ◽  
Rarefied Flow

Convective Cooling in the Transitional Rarefied Flow Regime

2014 ◽  
Author(s):  
Andrew D. Strongrich ◽  
Alina A. Alexeenko
Keyword(s):  
Heat Transfer ◽  
Flow Regime ◽  
Heat Transfer Performance ◽  
Thermal Dissipation ◽  
Potential Influence ◽  
Rarefied Flow ◽  
Rarefied Flows ◽  
Convective Thermal ◽  
Freely Suspended ◽  
Performance Results

Convective heat transfer in the transitional rarefied flow regime is evaluated both numerically using the ES-BGK collision model and experimentally for freely suspended silicon beams. Results are compared to both empirically derived continuum correlations as well as analytical free-molecule solutions, demonstrating a monotonic nonlinear transition between the two regimes. Both horizontal and vertical orientations were explored in an effort to evaluate the potential influence of buoyancy on heat transfer performance. Results demonstrate that such effects are largely insignificant for transitional rarefied flows and convective thermal dissipation is instead driven by thermal creep phenomena.

A Combined Rarefied and Continuum Flow Regime Model for Physical Vapor Deposition (PVD) Manufacturing Processes

2009 ◽  
Author(s):  
Kevin Gott ◽  
Anil K. Kulkarni ◽  
Jogender Singh
Keyword(s):  
Flow Regime ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Vacuum Chamber ◽  
Ideal Gas ◽  
Theoretical Studies ◽  
Cfd Analysis ◽  
Rarefied Flow ◽  
Continuum Flow ◽  
Vapor Cloud

Several modifications to physical vapor deposition (PVD) models are proposed to address the deficiencies in current theoretical studies. Simple calculations show that the flow regime of PVD fabrications will most likely vary from a continuum flow to a rarefied flow in the vacuum chamber as the vapor cloud expands toward the substrate. The flow regime for an evaporated ideal gas is calculated and then an improved equation of state is constructed and analyzed that more accurately describes vaporized metals. The result, combined with experimental observations, suggests PVD fabrication is best represented by a multi-regime flow. Then, a CFD analysis is summarized that further validates the multi-regime analysis hypothesis. Finally, a methodology for constructing and implementing the results of a theoretical multi-regime PVD model is presented.

DSMC Analysis of Fractal-like Aggregates of Spores in the Semi-rarefied Flow Regime

2011 ◽  
Author(s):  
Rakesh Kumar ◽  
TOng Zhu ◽  
Evgeny Titov ◽  
Deborah Levin
Keyword(s):  
Flow Regime ◽  
Rarefied Flow
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