An empirical model for the prediction of cloud height

Altintas E., AYRANCI TANSIK İ.

Chemical Engineering Research and Design, cilt.202, ss.327-335, 2024 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 202
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1016/j.cherd.2023.12.021
  • Dergi Adı: Chemical Engineering Research and Design
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), Biotechnology Research Abstracts, CAB Abstracts, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, Environment Index, Food Science & Technology Abstracts, Greenfile, INSPEC, Metadex, Pollution Abstracts, Veterinary Science Database, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.327-335
  • Anahtar Kelimeler: Cloud height model, High solids concentration, Solids suspension, Tall stirred tanks
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

At high solids concentrations (>2 vol%), a clear interface appears between solid-rich and liquid-rich parts of a solid-liquid mixing tank. The height of this interface is known as cloud height. The cloud height is one of the key design parameters; therefore, accurate prediction of it plays a critical role in the design of solid-liquid mixing tanks. This study proposes an empirical model that predicts cloud height as a function of particle properties, solids concentration (XV), off-bottom clearance, and impeller speed. Experiments were performed in a tall tank (H=1.5 T) agitated with a 45° down-pumping PBT. The model was tested against two independent data sets. It successfully predicts the cloud height for XV between 2 to 8 vol% and off-bottom clearance between T/6 to T/3. The size and the density of the particles were varied between 123 to 712 µm and 2500 to 7600 kg/m3, respectively. A modified version of the model was also proposed for high solids concentrations.