| 摘要 |
PURPOSE:To obtain a heat transfer medium having high heat transfer characteristic by incorporating a plurality of cylindrical first recesses relatively narrowed at openings and second recesses of smaller diameter and respectively formed in the bottoms of the first recesses in a porous electrodeposited metal layer. CONSTITUTION:In a heat transfer medium, a porous electrodeposited metal layer is formed on a metal base, and the layer has a plurality of cylindrical first recesses narrowed at openings and second recesses of smaller diameter and respectively formed in the bottoms of the first recesses. Since a nucleate boiling occurs not only in the first recesses but also in the second recesses, the boiling feasibly occurs as in the case of the sole first recesses, thereby enhancing thermal conduction efficiency. That is, bubbles to become seeds of nucleate boiling are generated from the second recesses, and the first recesses are then filled with the bubbles. In other words, the recesses of the small diameter performs a function as an initial boiling nucleate, then continuous nucleate boiling occurs, and the degree of superheat for the nucleate boiling is lowered. Since the recesses of different diameters are present, the recesses of suitable size for various viscous fluids are present to generate nucleate boiling. |
