Heat transfer and pressure drop of lithium flow under longitudinal strong magnetic field

The experiment was conducted to gain basic data for applying to the fusion reactor cooling. An electric heater pin of 7.6mm O.D. and 317mm active length with ten 0.5mm thermocouples was concentrically inserted into a 15.8mm I.D., 1.65mm thick, 316-SS tubing, forming an annular lithium flow channel. The test channel, blanketed with vacuum insulation and cooling layers, was placed in a solenoidal SCM of 104mm bore which had a maximum rating of B= 5T over 30cm axial length within 1% nonuniformity. The lithium loop had an electromagnetic pump of 40 lit/min and 3bar ratings and operated between 350-450 deg.C. The results are summarized as follows. In the absence of magnetic field, the heat transfer characteristics nearly agree with the Dwyers correlation. In the presence of magnetic field, the same as in the case of natural convection, the forced-convection heat transfer has a different trend from the general anticipation made so far that the heat transfer should be decreased in monotone with increasing the magnetic flux density B because suppression of flow turbulence