Effect of magnetic field on natural convection inside a partially-heated vertical duct: Experimental study. (April 2019)

• Record Type: Journal Article
• Authors: Kaneda, Masayuki; Nazato, Kensuke; Fujiwara, Hiroaki; Wada, Kengo; Suga, Kazuhiko
• Is Part Of: International journal of heat and mass transfer. Volume 132(2019)
• Page Start: 1231
• Page End: 1238
• Publication Date: 2019-04
• Subjects: Magnetic force -- Heat transfer enhancement -- Natural convection -- Paramagnetic liquid -- Magnetic field; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2018.12.056
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: The effect of the magnetic force by block magnet is experimentally investigated. Magnetic force on upper magnet edge can enhance the natural convection. That on lower magnet edge can suppress the convection. These effect and its mechanism are clarified in terms of the magnetic field from block magnet. Multiple magnet pronounces the magnetic force, but its direction is crucial for the heat transfer enhancement/suppression. Abstract: We experimentally study the effect of the magnetic force from one or more block magnets on natural convection of paramagnetic liquid inside a partially-heated duct. The permanent magnet(s) is/are placed partially/fully behind the heated wall. For a single magnet, the local heat transfer coefficient is suppressed near the bottom edge of the magnet and enhanced near the top edge if the magnet edge is behind the heated wall. This effect depends on the elevation of the magnet relative to the heated wall. Using two block magnets with alternating magnetic poles enhances the force and corresponding effect at their junction because of an increase in magnetic flux density.