Energy efficient thermal management at low Reynolds number with air-ferrofluid Taylor bubble flows. (June 2022)

• Record Type: Journal Article
• Authors: Kole, Madhusree; Shah, Ram Krishna; Khandekar, Sameer
• Is Part Of: International communications in heat and mass transfer. Volume 135(2022)
• Publication Date: 2022-06
• Subjects: Air-ferrofluid Taylor bubble flow -- Ferrofluid Convection -- Enhanced heat transfer -- Low Reynolds number -- Numerical simulation; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Heat -- Transmission; Mass transfer; Periodicals; 621.4022
• DOI: 10.1016/j.icheatmasstransfer.2022.106109
• Languages: English
• ISSNs: 0735-1933

Abstract

Abstract: Existing thermal management strategies for mini-/micro scale electronic devices have already reached their limits in several applications, necessitating development of innovative heat transfer methods. In this context, a novel heat transfer configuration involving convective heat transfer of two-phase air-ferrofluid Taylor bubble flow in a square mini channel at low Reynolds number ( Re between 70 and 150) is investigated. Presence of a magnetic field enhances local heat transfer while the pressure drop penalty is not high. Experimental results confirm significant augmentation of heat transfer coefficient, of the order of ~88% to ~95% depending on the flow Re . The augmentation strategy is particularly attractive for low Re flows, typically encountered in mini-/micro systems, where the induced magnetic forces will be able to dominate the flow inertia. Potential advantages of air-ferrofluid Taylor flows subjected to a magnetic field for heat transfer augmentation is exemplified through this study. Highlights: A novel study on heat transfer of two-phase air-ferrofluid Taylor bubble flow. Experiments are carried out at low Reynolds number. Heat transfer coefficient enhances ~95% in presence of a magnet compared to air-water. Pressure drop to achieve the same heat transfer is reduced with ferrofluids. Can serve as potential energy efficient thermal management candidates.