Non-Newtonian phase-change heat transfer of nano-enhanced octadecane with mesoporous silica particles in a tilted enclosure using a deformed mesh technique |
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| Institution: | 1. Metamaterials for Mechanical, Biomechanical and Multiphysical Applications Research Group, Ton Duc Thang University, Ho Chi Minh City, Vietnam;2. Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam;3. Young Researchers and Elite Club, Yasooj Branch, Islamic Azad University, Yasooj, Iran;4. Department of Mechanical Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran;5. ECAM Lyon, LabECAM, Université de Lyon, Lyon, France;1. Institute for Infrastructure and Environment, Heriot–Watt University, Edinburgh EH14 4AS, United Kingdom;2. Creative Engineering and Management Services, Deans Centre Peshawar, Pakistan;3. Department of Mechanical and Industrial Engineering, College of Engineering, Sultan Qaboos University, Oman;4. Maxwell Institute for Mathematical Sciences and Department of Mathematics, Heriot–Watt University, Edinburgh, EH14 4AS, United Kingdom;1. School of Civil Engineering, Nanyang Institude of Technology, Nanyang 473000, China;2. School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China;1. Barcelona Supercomputing Center, 08034 Barcelona, Spain;2. Laboratory of Hydraulic Engineering, Department of Civil Engineering, University of Patras, 26500, Patras, Greece;1. Departamento de Ingeniería de Proyectos, Universidad de Guadalajara, José Guadalupe Zuno No. 48, Zapopan, C.P. 45150, Jalisco, México;2. Departamento de Ingeniería en Redes y Telecomunicaciones, Universidad Politécnica de Juventino Rosas, Hidalgo No. 102, Santa Cruz de Juventino Rosas, Gto., Comunidad de Valencia, C.P. 38253, México;3. School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire, LE12 5RD, UK;4. GSC & CEIGRAM, ETSIAAB, Universidad Politécnica de Madrid (UPM). Ciudad Universitaria, C.P. 28040, Madrid, España |
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| Abstract: | In the present study, the melting phase-change heat transfer of nano-enhanced phase-change octadecane by using mesoporous silica particles is investigated in an inclined cavity, theoretically. The presence of mesoporous silica particles induces non-Newtonian effects in the molten octadecane. A phase-change interface-tracking approach, deformed mesh technique, is employed to track the phase-change interface and heat transfer in the cavity. The Arbitrary Lagrangian-Eulerian (ALE) moving mesh technique along with the finite element method is adopted to solve the governing equations for conservation of mass, momentum, and energy during the phase-change process. A re-meshing technique and an automatic time step control approach are employed to control the quality of the deformed mesh and the computed numerical solution. The effect of various mass fractions of nanoparticles and various inclination angles of the enclosure on the heat transfer and phase-change behavior of nano-enhanced octadecane are addressed. The outcome reveals that using the mesoporous silica particles diminish the heat transfer in the enclosure. Although the presence of nanoparticles improved the conductive heat transfer, a reduction in the phase-change heat transfer performance of the enclosure can be observed, which is due to the increase of the viscosity (consistency parameter) of the liquid and suppression of natural convective flows. Moreover, the presence of nanoparticles reduces the latent heat capacity of octadecane as they do not contribute to the phase-change energy storage. Dispersing 5% mass fraction of nanoparticles in octadecane can reduce the heat transfer up to 50% and increase the consistency parameter by three folds. The angle of inclination of the cavity also plays an important role in the heat transfer characteristics. Tilting the cavity by -75° leads to an 80% reduction in the heat transfer. |
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