単相密閉型サーモサイフォン内の流動特性(流体工学,流体機械)

概要

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As the heat transfer in the thermosyphon depends on natural convection flow inside, it is important to investigate the flow characteristics. Upward and downward flows meet each other in the intermediate section of thermosyphon and then a complicated flow takes place. Under certain condition, mutual interaction between both flows results in multi-branched flow. Present study focuses on such flow regime. Flow field in a series of vertical planes was measured by means of PIV technique. Experiments were conducted by using thermosyphon models; 100mm length, 30 or 46mm diameters. Three kinds of silicon oil were used as the working fluid and temperature difference between cooled and heated surfaces was changed up to 12K. Though similar flow patterns were observed, the number of branches increased when increasing the modified Rayleigh number Ra^* and at maximum 5 pairs of branches appeared for Ra^* of 10^6.
一般社団法人日本機械学会の論文
2004-09-25