[en] There are several methods for enhancement of heat transfer such as attaching radial and spiral fins on a channel surface or inserting twisted tape in the channel. These methods increase heat transfer coefficient or area by manufacturing of the heat transfer surface. The objective of this study is to clarify characteristics of heat transfer and pressure drop in the channel inserted metallic wire with high porosity. A heat transfer experiment was performed using a vertical rectangular or a horizontal circular channel to obtain the heat transfer characteristics in the channel inserted copper wire. From the results obtained in this experiment, it was found that an amount of heat removal in the channel with the copper wire was larger than that without one. An effectiveness of heat transfer enhancement increased with the temperature of the heated wall. The amount of heat removal in the rectangular and circular channel inserted copper wire, which has 0.993-0.998 of porosity, increased about 20% comparing with the channel having a smooth wall surface under the condition of the constant heat flux and lower than 170degC of wall temperature. (author)