期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 417, 期 -, 页码 148-159出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2016.05.029
关键词
Heat transfer; Ferrofluid; Thermomagnetic pump; Fluid mechanics; Natural convection
资金
- Blue Sky Instrument of SINTEF Energy research through a Strategic Institute Programme (SIP) by the National Basic Funding Scheme of Norway
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.
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