publication . Article . Other literature type . 2018

numerical simulation of nanofluid suspensions in a geothermal heat exchanger

Sun, Xiao-Hui; Yan, Hongbin; Massoudi, Mehrdad; Chen, Zhi-Hua; Wu, Wei-Tao;
Open Access
  • Published: 13 Apr 2018 Journal: Energies, volume 11, page 919 (eissn: 1996-1073, Copyright policy)
  • Publisher: MDPI AG
Abstract
It has been shown that using nanofluids as heat carrier fluids enhances the conductive and convective heat transfer of geothermal heat exchangers. In this paper, we study the stability of nanofluids in a geothermal exchanger by numerically simulating nanoparticle sedimentation during a shut-down process. The nanofluid suspension is modeled as a non-linear complex fluid; the nanoparticle migration is modeled by a particle flux model, which includes the effects of Brownian motion, gravity, turbulent eddy diffusivity, etc. The numerical results indicate that when the fluid is static, the nanoparticle accumulation appears to be near the bottom borehole after many ho...
Subjects
arXiv: Physics::Fluid DynamicsPhysics::Geophysics
free text keywords: General Computer Science, Suspension (vehicle), Fluid dynamics, Geothermal gradient, Geothermal heating, Engineering, business.industry, business, Mechanics, Thermal diffusivity, Convective heat transfer, Heat exchanger, Electronic engineering, Nanofluid, nanofluids, geothermal heat exchanger, suspension stability, pulsed flow, nanoparticle accumulation, Technology, T
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publication . Article . Other literature type . 2018

numerical simulation of nanofluid suspensions in a geothermal heat exchanger

Sun, Xiao-Hui; Yan, Hongbin; Massoudi, Mehrdad; Chen, Zhi-Hua; Wu, Wei-Tao;