Potential of enhancing a natural convection loop with a thermomagnetically pumped ferrofluid

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:417

Article

Aursand, Eskil¹  Gjennestad, Magnus Aa.¹  Lervag, Karl Yngve¹  Lund, Halvor¹ 

[1] SINTEF Energy Res, POB 4671 Sluppen, NO-7465 Trondheim, Norway

关键词: Heat transfer;    Ferrofluid;    Thermomagnetic pump;    Fluid mechanics;    Natural convection;   

DOI  :  10.1016/j.jmmm.2016.05.029

来源: Elsevier

【 摘 要 】

The feasibility of using a thermomagnetically pumped ferrofluid to enhance the performance of a natural convection cooling loop is investigated. First, a simplified analytical estimate for the thermomagnetic pumping action is derived, and then design rules for optimal solenoid and ferrofluid are presented. The design rules are used to set up a medium-scale (1 m, 10-1000 W) case study, which is modeled using a previously published and validated model (Aursand et al. [1]). The results show that the thermomagnetic driving force is significant compared to the natural convection driving force, and may in some cases greatly surpass it. The results also indicate that cooling performance can be increased by factors up to 4 and 2 in the single-phase and two-phase regimes, respectively, even when taking into the account the added heat from the solenoid. The performance increases can alternatively be used to obtain a reduction in heat-sink size by up to 75%. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free