Natural convection heat transfer of cold water between concentric cylinders for high rayleigh numbers—a numerical study

Natural convective heat transfer of water near its density maximum in an eccentric horizontal annulus

“…It was concluded that the effect of density inversion was unexpectedly large and average Nusselt (Nu) number was different from that of the Boussinesq liquids whose density decreases linearly with the increase of temperature. Later, Nguyen et al [26], Vasseur et al [27], Raghavarao and Sanyasiraju [28] obtained the heat transfer characteristics, velocity profiles, local and average Nusselt numbers of steady natural convection of cold water between two horizontal concentric cylinders with constant surface temperature for different Rayleigh (Ra) number, radius ratio and density inversion parameter. It was also found that the flow pattern was greatly influenced by the density inversion parameter of water.…”

Natural convection of water near its density maximum between horizontal cylinders

“…However, up to now, only a few investigations about this heat transfer problem have been reported. Seki et al [28], Nguyen et al [29], Vasseur et al [30] and Raghavarao and Sanyasiraju [31] investigated steady natural convective heat transfer of water near its density maximum between two horizontal concentric cylinders with constant surface temperatures for different Rayleigh (Ra) number, the radius ratio and the density inversion parameter. It was found that the flow pattern was greatly influenced by the density inversion parameter of water, and concluded that the effect of density inversion was unexpectedly large and the average Nusselt (Nu) number was different from that of Boussinesq liquids whose density decreased linearly with the increase of temperature.…”

Natural convection process endorsed in coaxial duct with Soret/Dufour effect

“…Borjini et al (1999) have mixed radiation and NC in a collaborating material between two horizontal co-focal ellipticals. The heat transfer of cold water via natural convection with density inversion of two isothermal horizontal concentric cylinders has been investigated numerically by Raghavarao and Sanyasiraju (1994). The results show that the inversion parameter, which defines the effects of additional convection caused by the inversion of water density within the annulus, has significant impact on flow patterns.…”