3D laminar natural convection in a cubical enclosure with gradually changing partitions

UĞURLUBİLEK N., SERT Z., Selimefendigil F., Öztop H. F.

International Communications in Heat and Mass Transfer, cilt.133, 2022 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 133
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1016/j.icheatmasstransfer.2022.105932
  • Dergi Adı: International Communications in Heat and Mass Transfer
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Compendex, INSPEC, Civil Engineering Abstracts
  • Anahtar Kelimeler: Gradually changing partition, Enclosure, Natural convection, CFD, 3D, HEAT-TRANSFER, SQUARE ENCLOSURE, NUMERICAL-ANALYSIS, RECTANGULAR ENCLOSURES, CONDUCTIVE PARTITION, FLUID-FLOW, CAVITY, HOT, AIR, PIV
  • Eskişehir Osmangazi Üniversitesi Adresli: Evet

Özet

© 2022 Elsevier LtdIn this paper, laminar natural convection heat transfer was numerically investigated in cubical air-filled enclosures with partitions attached to the walls with different positions. Steady-state governing equations were solved using the Boussinesq approximation by the finite volume method. Two cases were considered that the partitions were placed perpendicular (Case 1) and parallel (Case 2) to the active walls, respectively. The opposing lateral walls of the enclosure are heated and cooled while the other walls are adiabatic. The effect of the two inclined partitions attached to the bottom and top adiabatic walls at the different positions on the heat transfer rate was examined. The dimensionless partition heights and positions were h/H = 0.1, 0.2 and 0.3, and c/H = 0.25, 0.5 and 0.75, respectively. The inclination of the partitions was θ =3°, 4°, and 5°. The air (Pr = 0.7) streamlines and the temperature fields were obtained for the Rayleigh numbers 103 ≤ Ra ≤ 106 for both cases studied. The mean dimensionless heat transfer ratio (Nusselt number) over the cold wall for both cases was also obtained. The effects of the dimensionless parameters considered on the heat transfer for both cases were concluded. It was seen that the parameters considered are important for Case 2 whereas they did not play a major role for Case 1.