Heat flux at the transition from harmonic to chaotic flow in thermal convection

Details Heat flux at the transition from harmonic to chaotic flow in thermal convection Heat flux at the transition from harmonic to chaotic flow in thermal convection

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998phrve..58.4016c&link_type=abstract

Physical Review E (Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics), Volume 58, Issue 3, September 19

Physics

4

Transition To Turbulence, Stability Of Laminar Flows, Nonequilibrium And Irreversible Thermodynamics

Scientific paper

Numerical simulations of the fully compressible Navier-Stokes equations are used to study the transition from simple-periodic ``harmonic'' thermal convection to chaotic thermal convection as the Rayleigh number Ra is increased. The simulations suggest that a sharp discontinuity in the relationship between the Nusselt number Nu (the ratio of the total heat flux to the Fourier heat flux) and the Rayleigh number is associated with this transition in flow morphology. This drop in the Nusselt number is also seen in the data reported in independent experiments involving the convection of two characteristically different fluids-liquid mercury [Phys. Rev. E 56, R1302 (1997)] (a nearly incompressible fluid with Prandtl number Pr=0.024) and gaseous helium [Phys. Rev. A 36, 5870 (1987)] (a compressible fluid with unit Pr). The harmonic flow generates a dual-maximum (quasiharmonic) temperature histogram, while the chaotic flow generates a single-maximum histogram at the center point in the simulated cell. This is consistent with the temperature distributions reported for the convecting mercury before and after the drop in Nu. Our simulations also suggest a hysteresis in the Nu-Ra curve linking the two distinctly different flow morphologies, heat fluxes, and temperature-fluctuation histograms at the same Rayleigh number.

Affiliated with

Also associated with

No associations

Rating

Heat flux at the transition from harmonic to chaotic flow in thermal convection does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Heat flux at the transition from harmonic to chaotic flow in thermal convection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Heat flux at the transition from harmonic to chaotic flow in thermal convection will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1054700