CAJ | 학술논문

建立了处于空间中的孤立永磁体产生的永磁场中的二维方腔热磁自然对流模型，并通过数值计算的方法研究了方腔内空气在重力和磁化力驱动下的自然对流现象.在瑞利数105和磁场强度0.5~3.5 T范围内，研究了梯度磁场对自然对流的抑制作用，给出了方腔内磁浮升力场，温度场、流场的变化以及方腔内壁面的换热特性.结果表明：高剩磁钕铁硼永磁体磁场可以明显的抑制方腔内自然对流，与重力场自然对流相比，方腔内流场和温度场发生了明显的变化，剩磁3.5 T时Nu减小达47%.
건립료처우공간중적고립영자체산생적영자장중적이유방강열자자연대류모형，병통과수치계산적방법연구료방강내공기재중력화자화력구동하적자연대류현상.재서리수105화자장강도0.5~3.5 T범위내，연구료제도자장대자연대류적억제작용，급출료방강내자부승력장，온도장、류장적변화이급방강내벽면적환열특성.결과표명：고잉자녀철붕영자체자장가이명현적억제방강내자연대류，여중력장자연대류상비，방강내류장화온도장발생료명현적변화，잉자3.5 T시Nu감소체47%.
Magneto-thermal natural convection of air in a square enclosure under gravity field and together with a non-uniform magnetic field provided by a permanent Neodymium-Iron-Boron mag-net is numerically studied.The physical fields of magnetizing force,velocity and temperature as well as the local distribution characteristics of Nusselt number are all presented in this paper with Rayleigh number 105 and with the residual magnetic flux density ranges from 0.5 T to 3.5 T.The results show that the natural convection of air in the square enclosure under the magnetic and gravity fields is quite different from that under the gravity field alone.The natural convection is decreased when the magnetic field is added to the gravity field as the model studied in this paper and the inhibitory effect increases with increase of magnetic filed strength.The velocity and tem-perature fields and the distribution of the local value of Nusselt number are quite different from that under the gravity field alone.Under the magnetic field supplied by a permanent magnet with a residual magnetic flux density 3.5 Tesla,the value of Nu drops by 47%.