Characteristics of heat transfer and flow resistance of magnetic fluid flow through porous media combined with magnetic field effect
Characteristics of heat transfer and flow resistance of magnetic fluid flow through porous media combined with magnetic field effect
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结合磁场效应磁性流体流过多孔介质的传热及流阻特性
DOI：
10.1016/j.expthermflusci.2023.110851
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发表时间：
2023
影响因子：
3.2
通讯作者：
Chaiworapuek Weerachai
中科院分区：
文献类型：
--
作者：
Rakpakdee Wannarat;Motozawa Masaaki;Fukuta Mitsuhiro;Chaiworapuek Weerachai
在矩形通道内，对磁场作用下磁性流体在有、无多孔介质情况下的流动换热和流动阻力进行了实验研究。使用孔密度为13 PPI（每英寸孔数）的陶瓷泡沫作为多孔介质。主流流速在0.1和3.7 l/min之间变化，同时将磁场强度调节至0、100、300和500 mT。结果表明，在非多孔陶瓷和多孔陶瓷中施加磁场后，磁流体的流动都得到了强化。在500 mT的磁场强度下，在不存在和存在泡沫的情况下的传热增量分别为约16.8%和15.3%。通过施加磁性流体流通过泡沫，最大传热增量达到171.7%相比，没有泡沫在相同的流量。值得注意的是，结合使用磁场和陶瓷泡沫导致在低流速下的热传递的协同增强。流动通过泡沫的磁性流体具有比非泡沫磁性流体流高得多的流动阻力。在泡沫存在和不存在的情况下，通过向磁性流体施加磁场来增加压降。在本研究中，基于性能评价标准值对组合传热技术的性能进行了评价。结果表明，施加磁场后，有泡沫时磁流体流动的性能评价标准值高于无泡沫时。最后给出了磁流体换热系数与努塞尔数的关系式和磁流体性能评价准则。
The heat transfer and flow resistance of magnetic fluid flow under a magnetic field in the absence and presence of porous media were investigated experimentally in a rectangular duct. A ceramic foam, with a pore density of 13PPI (pores per inch), was used as a porous media. The mainstream flow rate varied between 0.1 and 3.7 l/min, while the magnetic intensity was adjusted to 0, 100, 300, and 500 mT. The results showed heat transfer was enhanced in both the non-porous and porous ceramic by applying the magnetic field to the magnetic fluid flow. Under a magnetic intensity of 500 mT, the heat transfer increments in the absence and presence of the foam were approximately 16.8% and 15.3%, respectively. By applying a magnetic fluid flow through the foam, the maximum heat transfer increment reached 171.7% compared to the absence of foam at the same flow rate. Notably, combining the use of a magnetic field and the ceramic foam resulted in a synergetic enhancement in heat transfer at low flow rates. The magnetic fluid flowing through the foam had a substantially higher flow resistance than the non-foam magnetic fluid flow. The pressure drop increased by applying a magnetic field to the magnetic fluid in the absence and presence of foam. The performance of the combined heat transfer techniques was evaluated in this research based on a performance evaluation criterion value. The results revealed that by applying the magnetic field, the performance evaluation criterion value of the magnetic fluid flow in the presence of foam was higher than in the absence of foam. Finally, the predictive formulas for Nusselt number and performance evaluation criterion as a function of Magnetic fluid heat transfer number were proposed.