Effect of distance between impeller blade tip and surface on mass transfer to a local electrode in a stirred vessel in a wide range of Sc number

YAPICI S., Altay I.

INDIAN CHEMICAL ENGINEER, cilt.64, sa.5, ss.576-593, 2022 (ESCI) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 64 Sayı: 5
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1080/00194506.2022.2059020
  • Dergi Adı: INDIAN CHEMICAL ENGINEER
  • Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.576-593
  • Anahtar Kelimeler: electrochemical limiting current technique, convective transfer, mass transfer, stirred vessel
  • İnönü Üniversitesi Adresli: Evet

Özet

Stirred vessels are encountered in a wide scale of applications from bench to industrial processes, and the knowledge of the heat/mass transfer rates in these vessels is required for their design, operation and control. This work submits an investigation on the mass transfer to a small circular surface immersed in a stirred vessel in the parameter ranges of 267 < Re <9437, 1473 < Sc <61,422, and 0.022 < x/d(k) < 0.22 for the distance between the impeller blade tip and the transfer surface. The Reynolds number was based on the impeller diameter. The electrochemical limiting diffusion current technique having a potassium ferri-/ferrocyanide system was applied for mass transfer coefficient measurements. Aqueous glycerine solutions were prepared to attain a wide range of Sc numbers. The rate of mass transfer is enhanced with increasing rotation rate, decreasing blade tip-to-electrode surface distance, and decreasing glycerine concentration. The experimental data were well correlated by the relation Sh = 8.517Re(0.473)Sc(0)(.402)(x/d(k))(-0.042).