Heat transfer and flowfields in short microchannels using direct simulation Monte Carlo

10.2514/3.926 ◽  
1997 ◽  
Vol 11 ◽  
pp. 489-496
Author(s):  
Rong F. Huang ◽  
Han W. Lee ◽  
C. Mavriplis ◽  
J. C. Ahn ◽  
R. Goulard
Keyword(s):  
Heat Transfer ◽  
Monte Carlo ◽  
Direct Simulation Monte Carlo ◽  
Direct Simulation ◽  
Simulation Monte Carlo

Computations of Low Pressure Fluid Flow and Heat Transfer in Ducts Using Direct Simulation Monte Carlo Method

1999 ◽  
Author(s):  
Fang Yan ◽  
Bakhtier Farouk
Keyword(s):  
Heat Transfer ◽  
Monte Carlo ◽  
Noble Gas ◽  
Direct Simulation Monte Carlo ◽  
Low Pressure ◽  
Direct Simulation ◽  
Flow And Heat Transfer ◽  
Gas Transport Properties ◽  
Pressure Profiles ◽  
Simulation Monte Carlo

Abstract High Knudsen (Kn) number flows are found in vacuum and micro-scale systems. Such flows are characterized by non-continuum behavior. For gases, the flows are usually in the slip or transition regimes. In this paper, the direct simulation Monte Carlo (DSMC) method has been applied to compute low pressure, high Kn flow fields in partially heated channels. Computations were carried out for nitrogen, argon, hydrogen, oxygen and noble gas mixtures. Variation of the Kn is obtained by reducing the pressure while keeping the channel width constant. Nonlinear pressure profiles along the channel centerline are observed. Heat transfer from the channel walls is also calculated and compared with the Graetz solution. The effects of varying pressure, inlet flow and gas transport properties (Kn, Reynolds number, Re and the Prandtl number, Pr respectively) on the wall heat transfer (Nu) were examined. A simplified correlation for predicting Nu¯ as a function of Pe¯ and Kn¯ is presented.

Gas Properties Effects in Microchannel Studies Using Direct Simulation Monte Carlo

2010 ◽  
Author(s):  
Masoud Darbandi ◽  
Abolfazl Karchani ◽  
Hassan Akhlaghi ◽  
Gerry Schneider
Keyword(s):  
Heat Transfer ◽  
Monte Carlo ◽  
Slip Flow ◽  
Direct Simulation Monte Carlo ◽  
Direct Simulation ◽  
Polyatomic Gases ◽  
Flow And Heat Transfer ◽  
Flow Through ◽  
Simulation Monte Carlo ◽  
Gas Properties

This paper concern is to study the gas properties effect in flow and heat transfer behaviors through microchannels using the direct simulation Monte Carlo method. The flow is rarefied and supersonic. The channels are investigated at two different inlet boundary conditions. The collision process is modeled using the NTC (no-time-counter) scheme. The VHS model is chosen to simulate collision between particle pairs. The study is provided for many different gases including nitrogen, helium, and oxygen. The Knudsen number is chosen in a manner to provide slip flow through the channel. The results show that the heat transfer from the wall is lower for heavier gases. A comparative study among the monatomic, diatomic, polyatomic gases shows that the heat transfer rate is lower for the polyatomic gases. The result shows that, the heat transfer from the wall is lower for the heavier gases than that for the lighter gas. For a fixed Mach number, the heat transfer from the wall decreases as the molecular diameter increases.

Unsteady disturbances in micro Rayleigh-Bénard flows using direct simulation Monte Carlo method

2018 ◽  
Vol 17 (4-5) ◽  
pp. 425-437 ◽  
Author(s):  
Y Fang ◽  
WW Liou
Keyword(s):  
Heat Transfer ◽  
Monte Carlo ◽  
Monte Carlo Method ◽  
Direct Simulation Monte Carlo ◽  
Vortical Flow ◽  
Computational Domain ◽  
Dependent Manner ◽  
Direct Simulation ◽  
Simulation Monte Carlo ◽  
Rayleigh Benard

The direct simulation Monte Carlo method is applied in this paper to simulate the micro Rayleigh-Bénard convection for the Rayleigh number of 10,159 and the Knudsen number of 0.01 in a time-dependent manner. A monatomic gas is enclosed between two infinite, parallel plates with the bottom plate at a higher temperature. Cases of three different computational domain sizes in the horizontal directions are simulated. Evolutions of the convective flow unsteady disturbances patterns and the wall heat transfer are studied in detail. Three stages of distinct flow characteristics can be identified as the flows develop from an initially uniform state. In the first stage, the heat is transferred mainly by conduction. The onset of the vortical flow structures marks the beginning of the second stage. Significant differences in the flow and the heat transfer characteristics are observed in the third stage of the three simulated flows. It is found that the simulated microflows develop vortex rolls that advect along the plates at uniform speeds, which has not been reported previously.

Computations of Low Pressure Fluid Flow and Heat Transfer in Ducts Using the Direct Simulation Monte Carlo Method

2002 ◽  
Vol 124 (4) ◽  
pp. 609-616 ◽  
Author(s):  
Fang Yan ◽  
Bakhtier Farouk
Keyword(s):  
Heat Transfer ◽  
Monte Carlo ◽  
Noble Gas ◽  
Direct Simulation Monte Carlo ◽  
Low Pressure ◽  
Gas Flows ◽  
Direct Simulation ◽  
Flow And Heat Transfer ◽  
Pressure Profiles ◽  
Simulation Monte Carlo

High Knudsen number (Kn) gas flows are found in vacuum and micro-scale systems. Such flows are usually in the slip or transition regimes. In this paper, the direct simulation Monte Carlo (DSMC) method has been applied to compute low pressure, high Kn flow fields in partially heated channels. Computations were carried out for nitrogen, argon, hydrogen, oxygen and noble gas mixtures. Variation of the Kn is obtained by reducing the pressure while keeping the channel width constant. Nonlinear pressure profiles along the channel centerline are observed. Heat transfer from the channel walls is also calculated and compared with the classical Graetz solution. The effects of varying pressure, inlet flow and gas transport properties (Kn, Reynolds number, Re and the Prandtl number, Pr respectively) on the wall heat transfer (Nusselt number, Nu) were examined. A simplified correlation for predicting Nu¯ as a function of the Peclet number, Pe¯ and Kn¯ is presented.

Heat Transfer in Noble Gases Using Direct Simulation Monte Carlo Technique (DSMC)

2002 ◽  
Vol 2 (12) ◽  
pp. 1050-1056 ◽  
Author(s):  
Mohamed M. Elafify . ◽  
Khalil M. Elawadly . ◽  
Sherif G. Elsharkawy . ◽  
M. Bassiouny .
Keyword(s):  
Heat Transfer ◽  
Monte Carlo ◽  
Noble Gases ◽  
Direct Simulation Monte Carlo ◽  
Monte Carlo Technique ◽  
Direct Simulation ◽  
Simulation Monte Carlo

Heat Transfer and Flowfields in Short Microchannels Using Direct Simulation Monte Carlo

1997 ◽  
Vol 11 (4) ◽  
pp. 489-496 ◽  
Author(s):  
C. Mavriplis ◽  
J. C. Ahn ◽  
R. Goulard
Keyword(s):  
Heat Transfer ◽  
Monte Carlo ◽  
Direct Simulation Monte Carlo ◽  
Direct Simulation ◽  
Simulation Monte Carlo
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