Multijet impingement heat transfer under the combined effects of encapsulated-PCM and inclined magnetic field during nanoliquid convection

In this study, convective heat transfer performance for confined multiple jet impinging system with phase change-packed bed (PCM-PB) installed sub-system under magnetic field effects is numerically assessed during hybrid nanoliquid convection. Both phase transition and heat transfer dynamics are analyzed by using finite element method. Numerical study is conducted for different magnetic field strength (Hart-mann number-Ha between 0-40), inclination (between 0-90), distance between the slots (between 3w-6w) and nanoparticle loading (between 0-2 % ) for the cases with and without PCM-PB zone. Phase tran-sition and heat transfer dynamics are influenced by the presence of magnetic field and varying its am-plitude/inclination. Complete phase change time (TP) is reduced by about 15 % and 11.7 % for pure liquid and nanoliquid when varying Ha from 0 to 10. Inclination of gamma = 0 provides the fastest phase transi-tion dynamics. Spatial average Nusselt number (Nu) rises by about 13.5 % by using impinging system with PCM+nanoliquid at the highest Ha as compared to system using only pure liquid. Phase transi-tion becomes slower for higher distance values between the slots while the average Nu rises by about 48.8 % . As the reference case of system using pure liquid without magnetic filed and without PCM are used, up to 84.88 % rise of average Nu is achieved by using PCM+nanoliquid under magnetic field at the highest strength. Dynamic fit for the thermal performance of the impinging system installed with PCM+nanoliquid under magnetic field with system identification is obtained.(c) 2022 Elsevier Ltd. All rights reserved.

Automated summary

This study numerically evaluates the convective heat transfer performance of a confined multiple jet impinging system with a phase change-packed bed (PCM-PB) sub-system under the effects of a magnetic field during hybrid nanoliquid convection. The presence of the magnetic field and its amplitude/inclination variation influence phase transition and heat transfer dynamics. The complete phase change time is reduced by about 15% and 11.7% for pure liquid and nanoliquid, respectively, when varying the magnetic field strength. The fastest phase transition dynamics are observed at an inclination angle of 0. Impinging system using PCM+nanoliquid at the highest magnetic field strength shows a 13.5% increase in the spatial average Nusselt number (Nu) compared to the system using only pure liquid. The phase transition becomes slower with larger distance values between the slots, while the average Nu increases by about 48.8%. When compared to the reference case without a magnetic field and PCM, the use of PCM+nanoliquid under a magnetic field at the highest strength achieves up to an 84.88% increase in the average Nu. The thermal performance of the impinging system installed with PCM+nanoliquid under a magnetic field is obtained through system identification. (c) 2022 Elsevier Ltd. All rights reserved.