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Laminar Pipe Flow with Mixed Convection under the Influence of Magnetic Field

机译：磁场影响下具有混合对流的层流管流

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摘要

Magnetic influence on ferronanofluid flow is gaining increasing interest from not only the scientific community but also industry. The aim of this study is the examination of the potentials of magnetic forces to control heat transfer. Experiments are conducted to investigate the interaction between four different configurations of permanent magnets and laminar pipe flow with mixed convection. For that purpose a pipe flow test rig is operated with a water-magnetite ferronanofluid. The Reynolds number is varied over one order of magnitude (120–1200). To characterise this suspension, density, solid content, viscosity, thermal conductivity, and specific heat capacity are measured. It is found that, depending on the positioning of the magnet(s) and the Reynolds number, heat transfer is either increased or decreased. The experiments indicate that this is a local effect. After relaxation lengths ranging between 2 and 3.5 lengths of a magnet, all changes disappeared. The conclusion from these findings is that magnetic forces are rather a tool to control heat transfer locally than to enhance the overall heat transfer of heat exchangers or the like. Magnetically caused disturbances decay due to viscous dissipation and the flow approaches the basic state again.
机译：磁性影响对铁氧氧氧氧化体流动的磁力影响不仅会增加兴趣，不仅是科学界，而且越来越兴趣。本研究的目的是检查磁力的潜力以控制热传递。进行实验以研究与混合对流的永磁体和层管流的四种不同配置之间的相互作用。为此目的，使用水磁铁矿FerronanofloId操作管道流量试验台。雷诺数在一个数量级（120-1200）上变化。为了表征该悬浮液，测量密度，固体含量，粘度，导热率和特定热容量。发现，根据磁铁的定位和雷诺数，传热增加或减少。实验表明这是一种局部效果。放松长度在2到3.5长的磁铁之间的范围内，所有变化都消失了。从这些发现的结论是磁力是控制热传递局部的工具，而不是增强热交换器的总热传递等。由于粘性耗散而磁性引起的干扰衰减，并且流程再次接近基本状态。

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