HEAT EXCHANGER TUBE

PROBLEM TO BE SOLVED: To provide a heat exchanger tube which can largely improve performance more than before when employed to a heat exchanger such as an EGR cooler.SOLUTION: In a heat exchanger tube, a flat tube main body 14 is employed which has such a shape that a plurality of pieces of circular pipes are made to approximate each other, aligned in a plane shape, and connected to each other with an approximating region between the circular pipes as a communication part 13, swirl flow formation protrusions 16 are formed at internal peripheral faces of circuit pipe parts 15 equivalent to the circular pipes of the flat tube main body 14 so as to progress along spiral trajectories which are coaxial with center axes O of the circular pipe parts 15, and swirl flows of an exhaust gas 10 can be individually formed at the respective circular pipe parts 15. A partitioning wall 17 is formed at least at a part of the communication part 13 at a latter half of the flat tube main body 14.SELECTED DRAWING: Figure 1 【課題】ＥＧＲクーラ等の熱交換器に採用した場合に従来よりも大幅な性能向上を実現し得る熱交換器用チューブを提供する。【解決手段】複数本の円管を互いに近接させて平面状に並べ且つその相互間の近接部位を連通部１３として接続した如き形状の偏平チューブ本体１４を採用し、該偏平チューブ本体１４の前記円管に相当する円管部１５の内周面に該円管部１５の中心軸Ｏと同心の螺旋軌道に沿うように旋回流形成突起１６を形成し、前記各円管部１５に個別に排気ガス１０の旋回流を形成し得るように構成した熱交換器用チューブに関し、前記偏平チューブ本体１４の後半部分における少なくとも一部の連通部１３に区画壁１７を形成する。【選択図】図１