HEAT EXCHANGER

To provide a heat exchanger capable of achieving high cooling efficiency even though a pump with small power consumption and small output is used, and suppressing variation in a heat removal amount of an overall cooler.SOLUTION: A heat exchanger of the present invention includes a cooling liquid flow passage provided thermally connected to a heating element. A Reynolds number of cooling liquid flowing through the cooling liquid flow passage is less than a critical Reynolds number. The cooling liquid flow passage includes a plurality of weirs erected on an inner wall on the heating element side, and provided across a direction orthogonal to a direction of the cooling liquid flow passage. A shape of the weirs is a wave form rolling in the direction of the cooling liquid flow passage, and the weirs are arranged so that a heat transfer rate from the heating element to the cooling liquid on a downstream side of the cooling liquid flow passage is higher than on an upstream side, thereby providing a heat exchanger with high cooling efficiency capable of suppressing variation in a heat removal amount of an overall cooler.SELECTED DRAWING: Figure 1 【課題】消費電力が少なく出力が小さなポンプを用いても冷却効率が高く、冷却器全体の抜熱量ばらつきを抑制できる熱交換器を提供する。【解決手段】本発明の熱交換器は、発熱体に熱的に接続して設けられた冷却液流路を備える。そして、上記冷却液流路を流れる冷却液のレイノルズ数が臨界レイノルズ数未満であり、上記冷却液流路が、その発熱体側の内壁に立設し、冷却液流路方向と直交する方向に横断して設けられた堰を複数有し、上記堰の形状が、冷却液流路方向にうねった波形であり、上記冷却液流路の下流側が上流側よりも上記発熱体から上記冷却液への熱伝達率が高くなるように、上記堰が配置されていることとしたため、冷却効率が高く、冷却器全体の抜熱量ばらつきを抑制できる熱交換器を提供できる。【選択図】図１