Numerical investigation of transient natural convection heat transfer of freezing water in a square cavity

EZAN M. A., Kalfa M.

INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, cilt.61, ss.438-448, 2016 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 61
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1016/j.ijheatfluidflow.2016.06.004
  • Dergi Adı: INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.438-448
  • Anahtar Kelimeler: Transient model, Effectiveness, Solidification, Phase change, PHASE-CHANGE MATERIAL, RECTANGULAR CAVITY, DENSITY EXTREMUM, ENCLOSURE, BUOYANCY, MAXIMUM
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

In this study, a transient heat transfer process of freezing water inside a two-dimensional square cavity has been investigated numerically. Water was used as a phase-change medium, and the numerical model has been created with control volume approach by using C++ programming language. To be able to accelerate the numerical calculations, CUT (Consistent-Update-Technique) algorithm has been implemented in the numerical code. Span-wise variations of the vertical component of the velocity have been represented in comparison with the experimental measurements from the literature at various vertical positions to examine the accuracy of the numerical scheme. The influence of natural convection has been considered by comparing the conduction and convection dominated solidification under same boundary conditions. Comparative results have been obtained regarding time-wise variations of the cold wall temperature and the dimensionless effectiveness. Moreover, the streamlines and isotherms have been represented to understand the differences between the conduction and convection driven phase change processes.