Investigations clearly show that the axial conductive heat weakens the convective heat transfer in micro steel tube and the decrement may be more than 2% compared to the quantity of whole convective heat transfer when the working fluid is nitrogen gas. 研究表明,在氮气为工质下,微钢管轴向导热导致内部换热的减弱,减少量超过总对流换热量的2%。