| 摘要 |
A passage to supply the coolant and impellers having scraper vanes extending toward the surface of said passage are arranged in proximal relation to each other in a space for housing the liquid to be cooled. At least one of the coolant passage and the impeller is made movable in relation to the other. By the relative movement of the passage and the impeller, the motion of forcibly removing the cooled liquid from the heat exchange portion of the passage surface and the motion of supplying the high temperature liquid to the said heat exchange portion are repeated.
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