線熱源からの対流プルームの多孔質層透過に関する研究

概要

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An experimental and analytical study is made on the effects of a horizontal porous layer on the development of the buoyant plume arising from a line heat source. In the experiments, the porous layer is simulated by an array of acrylic resin plates spaced with a small gap width according to the Hele-Shaw analogy. Visual observations and experimental temperature distributions show the expansion and contraction of the plume at the lower and upper interfaces of the permeable layer. It is then found that similarity solutions assuming their proper virtual origins can approximately predict the changes in the plume width at the interfaces. The vicinity of the interface is understood as a region of transition between the similarity solutions. The numerical analysis adopts the Beavers-Joseph slip boundary condition with the slip coefficient a estimated as α=1/√<ε>, where ε is the prosity of the porous layer. A fairly good agreement between the experimental and numerical results confirms the validity of the slip coefficient a=1/√<ε>.
社団法人日本機械学会の論文
1993-02-25