Flow Characteristics of Erythritol Slurry as Heat Transfer Medium for Medium/Low Temperature Application with Pipe Transportation

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Other Title
  • 配管搬送を想定した中低温用熱媒体エリスリトールスラリーの流動特性
  • 配管搬送を想定した中低温用熱媒体エリスリトールスラリーの流動特性 : 水平冷却管内壁面への結晶固着と剥離条件
  • ハイカン ハンソウ オ ソウテイ シタ ナカビクオンヨウ ネツバイタイ エリスリトールスラリー ノ リュウドウ トクセイ : スイヘイ レイキャクカン ナイヘキメン エ ノ ケッショウ コチャク ト ハクリ ジョウケン
  • －Conditions of Crystals Fixation and Separation on Inner Wall of Horizontal Cooled Pipe－
  • －水平冷却管内壁面への結晶固着と剥離条件－

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<p>We investigated the blockage condition of erythritol slurry flowing in cooled pipe to avoid the blockage of the pipe. In this work, we focused on the effect of the fixation of the solid on the inner surface of the pipe. The fixation condition was investigated by varying the flow velocity and cooling rate. The PMMA pipe was used to investigate the effect of surface properties of the pipe, and the result was compared with that of previous work in which silicone tube was used. As the results of the experiment, we found 4 flow patterns in the slurry flow depending on flow velocity and solid fraction. When flow velocity is low, erythritol crystals sinks the bottom of the pipe, and fixation causes on the top and bottom surface of the pipe. The sinking crystals cause blockage because of accumulation of the crystals. When flow velocity is larger and it forms heterogeneous flow, erythritol crystals fix on the top of the pipe, while they do not fix on the bottom. Because crystals on the bottom surface are separated by collision of the flowing crystals. When it forms homogeneous flow, the fixation is inhibited, because the separation by the collision occurs in the whole side. Comparing silicone tube, the fixation is facilitated on the surface of PMMA pipe. As a result, it can be said that the blockage condition depends on flow velocity, cooling rate, flow pattern and surface properties of the pipe.</p>

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