Non-Uniform Magnetic Field Effect on Forced Convection Heat Transfer of Flattened Tubes Using Two-Phase Mixture Model

Yousefi, Elnaz; Nazif, Hamid Reza; Khaboshan, Hasan Najafi; Azarinia, Amiratabak

doi:10.1080/01457632.2020.1766251

Cited by 15 publications

(5 citation statements)

References 61 publications

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“…This is because an externally applied magnetic field increases the collision and attraction between particles-liquid, particles-particles, particles-wall, and improves the fluid's heat transfer having magnetic nanoparticles suspension. Factors such as distribution, inclination, and direction of the magnetic field considerably affect the improvement of heat transfer under the magnetic field [339][340][341].Here, a summary of these forces is described. Table 5 below shows the external forces.…”

Section: External Forcesmentioning

confidence: 99%

Recent advances on the fundamental physical phenomena behind stability, dynamic motion, thermophysical properties, heat transport, applications, and challenges of nanofluids

et al. 2022

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Section: External Forcesmentioning

confidence: 99%

Recent advances on the fundamental physical phenomena behind stability, dynamic motion, thermophysical properties, heat transport, applications, and challenges of nanofluids

et al. 2022

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“…Many factors, such as the direction, the inclination of the magnetic field and the distribution of the magnetic field, will considerably influence the heat transfer enhancement in the presence of a magnetic field. Wu et al [30], Siddiqui et al [112], Singh et al [113], and Yousefi et al [114] considered the influence of magnetic field direction, magnetic field inclination angle and magnetic field distribution on the heat transfer of magnetic fluid. Wu et al [30] explored the influence of magnetic field intensity and distribution on magnetic fluid.…”

Section: Positive Impactmentioning

confidence: 99%

“…It was also shown, the average Nusselt number increases with the Hartmann number. Yousefi et al [114] simulated the influence of a non-uniform magnetic field on the forced convection heat transfer of ferrofluids. The results showed that placing two parallel wires in the flat part of the flattened tube will produce the maximum heat transfer and pressure drop of ferrofluids.…”

Section: Positive Impactmentioning

confidence: 99%

A Review on Heat Transfer of Nanofluids by Applied Electric Field or Magnetic Field

et al. 2020

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Nanofluids are considered to be a next-generation heat transfer medium due to their excellent thermal performance. To investigate the effect of electric fields and magnetic fields on heat transfer of nanofluids, this paper analyzes the mechanism of thermal conductivity enhancement of nanofluids, the chaotic convection and the heat transfer enhancement of nanofluids in the presence of an applied electric field or magnetic field through the method of literature review. The studies we searched showed that applied electric field and magnetic field can significantly affect the heat transfer performance of nanofluids, although there are still many different opinions about the effect and mechanism of heat transfer. In a word, this review is supposed to be useful for the researchers who want to understand the research state of heat transfer of nanofluids.

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“…The influence of several factors on flow pressure drop was investigated, including Reynolds number of fluid flow, aspect ratio, and concentration of nano-particles in the base fluid. Yousefi et al [13] used a model of two-phase mixture to explore the influence of a magnetic field on forced convection heat transmission of ferro-fluids in flattened tubes. They also investigate the impact of tube flattening in a non-uniform magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Gas-liquid two-phase flow pressure drop in flattened tubes: an experimental and numerical study

YAQOP

2024

Journal of Thermal Engineering

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Experimental, numerical and empirical research is carried out on pressure drop features of air-water two-phase flow in horizontal flattened tubes. Circular tubes of 10.5 mm I.D. made of copper were successively flattened into inner heights of 9, 8, and 6 mm (AR=1.27, 1.5, and 2.2, respectively). The experiment operation conditions were 200, 500, and 1000 kg/m2s for mass velocity, 6, 8, 10 LPM for flow rate, and 0 to 0.005 for gas quality. Also, the pressure drop for R134a and R410A was estimated numerically using ANSYS Fluent. The simulation test condi-tions were for vapor quality of 0.1 to 0.9 and saturation temperature of 40°C, while the condi-tions for mass velocity and flowrate are taken as that of the experiment test. The experimental data were examined to see how different factors affect on the pressure gradient. According to the outcomes and as compared to the circular tube, the pressure gradient was raised up to 27%, 95%, and 218% for tubes ﬂattened with aspect ratio of 1.27, 1.5, and 2.2, respectively. More-over, the pressure drop for either air-water or refrigerant fluids is increased dramatically with increasing flow rate, but it decreases with increasing vapor quality. When compared to known circular tube correlations, a good agreement was achieved. Finally, the minimum difference between the experimental, numerical, and correlated results was less than 3% for gas quality of 0.0048 and aspect ratio of 2.2.

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Non-Uniform Magnetic Field Effect on Forced Convection Heat Transfer of Flattened Tubes Using Two-Phase Mixture Model

Cited by 15 publications

References 61 publications

Recent advances on the fundamental physical phenomena behind stability, dynamic motion, thermophysical properties, heat transport, applications, and challenges of nanofluids

Recent advances on the fundamental physical phenomena behind stability, dynamic motion, thermophysical properties, heat transport, applications, and challenges of nanofluids

A Review on Heat Transfer of Nanofluids by Applied Electric Field or Magnetic Field

Gas-liquid two-phase flow pressure drop in flattened tubes: an experimental and numerical study

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