scholarly journals Flux-limiting effects in a quasisteady plasma corona with nonclassic heat flux

1992 ◽  
Vol 10 (4) ◽  
pp. 645-649
Author(s):  
J. Ramirez
Keyword(s):  
Heat Flux ◽  
Transition Regime ◽  
Plasma Corona ◽  
Heat Flux Law ◽  
Flux Limiting ◽  
Calculated Flux

The quasisteady expansion of a plasma ablated from a laser-irradiated pellet with classic (Spitzer) heat flux is reconsidered with a nonclassic heat flux law. The nonphysical flux factor (calculated flux vs. free streaming), going to infinity as one goes away from the pellet in the above transition regime, is corrected.

The conserved Penrose–Fife system with Fourier heat flux law

2003 ◽  
Vol 53 (7-8) ◽  
pp. 1089-1100 ◽  
Author(s):  
Elisabetta Rocca ◽  
Giulio Schimperna
Keyword(s):  
Heat Flux ◽  
Heat Flux Law

Non-Fourier Heat-Flux Law for Diatomic Gases

2000 ◽  
Vol 14 (2) ◽  
pp. 281-283 ◽  
Author(s):  
Abdulmuhsen H. Ali
Keyword(s):  
Heat Flux ◽  
Heat Flux Law

Bénard convection and the Cattaneo law of heat conduction

1984 ◽  
Vol 96 (1-2) ◽  
pp. 175-178 ◽  
Author(s):  
B. Straughan ◽  
F. Franchi
Keyword(s):  
Heat Flux ◽  
Heat Conduction ◽  
Onset Of Convection ◽  
Bénard Convection ◽  
Benard Convection ◽  
Heat Flux Law ◽  
Rayleigh Numbers ◽  
Cattaneo Heat Flux

SynopsisCritical Rayleigh numbers are obtained for the onset of convection when the Maxwell–Cattaneo heat flux law is employed. It is found that convection is possible in both heated above and below cases.

Towards the development of a multiscale, multiphysics method for the simulation of rarefied gas flows

2010 ◽  
Vol 661 ◽  
pp. 262-293 ◽  
Author(s):  
DAVID A. KESSLER ◽  
ELAINE S. ORAN ◽  
CAROLYN R. KAPLAN
Keyword(s):  
Heat Flux ◽  
Boltzmann Equation ◽  
Conservation Laws ◽  
Rarefied Gas ◽  
Multiscale Methods ◽  
Time Interval ◽  
Gas Flows ◽  
Transition Regime ◽  
Rarefied Gas Flows ◽  
The Boltzmann Equation

We introduce a coupled multiscale, multiphysics method (CM3) for solving for the behaviour of rarefied gas flows. The approach is to solve the kinetic equation for rarefied gases (the Boltzmann equation) over a very short interval of time in order to obtain accurate estimates of the components of the stress tensor and heat-flux vector. These estimates are used to close the conservation laws for mass, momentum and energy, which are subsequently used to advance continuum-level flow variables forward in time. After a finite time interval, the Boltzmann equation is solved again for the new continuum field, and the cycle is repeated. The target applications for this type of method are transition-regime gas flows for which standard continuum models (e.g. Navier–Stokes equations) cannot be used, but solution of Boltzmann's equation is prohibitively expensive. The use of molecular-level data to close the conservation laws significantly extends the range of applicability of the continuum conservation laws. In this study, the CM3 is used to perform two proof-of-principle calculations: a low-speed Rayleigh flow and a thermal Fourier flow. Velocity, temperature, shear-stress and heat-flux profiles compare well with direct-simulation Monte Carlo solutions for various Knudsen numbers ranging from the near-continuum regime to the transition regime. We discuss algorithmic problems and the solutions necessary to implement the CM3, building upon the conceptual framework of the heterogeneous multiscale methods.

Transition Boiling Heat Transfer and the Film Transition Regime

1987 ◽  
Vol 109 (3) ◽  
pp. 746-752 ◽  
Author(s):  
J. M. Ramilison ◽  
J. H. Lienhard
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Contact Angle ◽  
Boiling Heat Transfer ◽  
Negative Slope ◽  
Transition Regime ◽  
Rational Scheme ◽  
Advancing Contact Angle ◽  
Minimum Heat ◽  
Made In

The “Berenson” flat-plate transition-boiling experiment has been re-created with a reduced thermal resistance in the heater, and an improved access to those portions of the transition boiling regime that have a steep negative slope. Tests have been made in Freon-113, acetone, benzene, and n-pentane boiling on horizontal flat copper heaters that have been mirror-polished, “roughened,” or teflon-coated. The resulting data reproduce and clarify certain features observed by Berenson: the modest surface finish dependence of boiling burnout, and the influence of surface chemistry on both the minimum heat flux and the mode of transition boiling, for example. A rational scheme of correlation yields a prediction of the heat flux in what Witte and Lienhard previously identified as the “film-transition boiling” region. It is also shown how to calculate the heat flux at the boundary between the pure-film, and the film-transition, boiling regimes, as a function of the advancing contact angle.

The Effect of Heat Flux Limiting on Divertor Fluid Models

1996 ◽  
Vol 36 (2-3) ◽  
pp. 419-423 ◽  
Author(s):  
M. Day ◽  
B. Merriman ◽  
F. Najmabadi ◽  
R. W. Conn
Keyword(s):  
Heat Flux ◽  
Fluid Models ◽  
Flux Limiting
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