On laminar natural convection inside multi-layered spherical shells

Yosef Gulberg, Yuri Feldman

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


Laminar natural convection flow inside multi-layered spherical shells with internal hot and external cold boundaries was investigated. Direct numerical simulations (DNS), which were performed by utilizing the immersed boundary method, addressed the fully 3D natural convection flow inside spherical shells with concentric, eccentric, equi-spaced and non-equi-spaced zero-thickness internal baffles. The insulation efficiency of the spherical shell was studied for up to four equi-spaced concentric internal layers. A unified functional dependency correlating modified Nu∗ and Ra∗ numbers was derived for spherical shells with up to four equi-spaced concentric internal layers. The effects of both vertical and horizontal eccentricity of the internal layers and of the width variation of concentric layers on the overall insulating performance of the spherical shell were investigated and quantified in terms of the Nu-Ra functionality.

Original languageEnglish
Pages (from-to)908-921
Number of pages14
JournalInternational Journal of Heat and Mass Transfer
StatePublished - 29 Dec 2015


  • Immersed boundary method
  • Laminar natural convection
  • Multi-layered spherical shells
  • Nu-Ra functional relation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes


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