水平環状空間内の水の密度逆転を伴う3次元自然対流熱伝導(熱工学,内燃機関,動力など)

概要

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Three-dimensional natural convection of water near the density extremum within a horizontal annulus is studied numerically for three temperatures of the outer cylinder of 4, 6 and 8℃ with the inner cylinder temperature maintained at 0℃. It has been found that owing to the density extremum water flows upward along both the inner and outer cylinder surfaces and downward in-between. It has also been found that in the case of T_0=6℃, a velocity field with two pairs of counter-rotating flow form in the upward vertical cross section parallel to the annulus axis, and the local Nusselt number distribution on the inner cylinder surface takes peak values at the locations toward which the counter-rotating flow conveys the higher temperature water heated by the outer cylinder, while in the case of T_0=8℃, a velocity field with counter-rotating flow in the cross section parallel to the annulus axis forms in the side and bottom regions, and the local Nusselt number distribution on the inner cylinder surface shows the corresponding peak values.
一般社団法人日本機械学会の論文
2003-04-25