Effects of high magnetic fields on thermal convection of conductive aqueous solution
Effects of high magnetic fields on thermal convection of conductive aqueous solution
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DOI：
10.7567/jjap.54.077301
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发表时间：
2015-06
影响因子：
1.5
通讯作者：
Yan Wang;N. Hirota;H. Okada;Y. Sakka
中科院分区：
文献类型：
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作者：
Yan Wang;N. Hirota;H. Okada;Y. Sakka
通过热输运测量和基于阴影技术的可视化，研究了常温下磁场对导电水溶液中热对流的影响。事实上，在导电性的硫酸铵反磁性水溶液中观察到了磁场对热对流的抑制作用。发现抑制的大小取决于施加的磁场和样品流体的电导率。通过假设作用在流体上的洛伦兹力是主要参与者，可以定性地理解这些影响。在此基础上，提出了一种利用强磁场控制换热过程的方法。用电解质水溶液和超导磁体相结合来理解液态金属的行为似乎是可行的，因为这样就可以认为流动条件类似于工业电磁铁中液态金属的流动条件。
Effects of magnetic fields on the thermal convection in conductive aqueous solutions at ambient temperatures have been studied through heat transport measurements combined with shadowgraph technique-based visualization. The suppression of thermal convection by magnetic field was in fact observed in conductive diamagnetic aqueous solutions of ammonium sulfate. The magnitude of the suppression was found to depend on the applied magnetic field and the electrical conductivity of the sample fluid. These effects are qualitatively understood by assuming that Lorentz force acting on the fluid is a main player. Based on these results, a control method of heat transfer process using high magnetic fields has been demonstrated. It seems feasible to understand the behaviors of liquid metals by using electrolytes aqueous solution combined with a superconducting magnet, since flow conditions thereby are regarded as similar to those for liquid metals in industrial electromagnets.