A Thermochromic Liquid Crystals Image Analysis technique to investigate temperature polarization in spacer-filled channels for Membrane Distillation

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

The analysis of flow fields and temperature distributions is of paramount importance in the development and optimization of new spacer-filled channel geometries for Membrane Distillation modules. The literature reports only few studies on the experimental characterization of such channels and, to the authors’ knowledge, none of them presents local information concerning the temperature distribution on the membrane surface. In the present work, a non-intrusive experimental technique named TLC-IA-TP is presented: it is based on the use of Thermochromic Liquid Crystals (TLCs) and digital Image Analysis (IA) and it is applied here for the first time to the analysis of Temperature Polarization (TP) in spacer-filled channels typically adopted in thermally-driven membrane separation processes. In particular, this technique allows the local distribution of convective heat transfer coefficients to be determined, thus providing (i) useful indications on strengths and weaknesses of some spacer arrangements and (ii) valuable benchmark data for Computational Fluid Dynamics (CFD) studies. For the purpose of the present work, the technique’s fundamentals are presented, along with a comprehensive assessment of the technique’s accuracy. Results of some preliminary measurements on commercial spacers are also reported.
Original languageEnglish
Pages (from-to)260-273
Number of pages14
JournalJournal of Membrane Science
Volume447
Publication statusPublished - 2013

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • General Materials Science
  • Physical and Theoretical Chemistry
  • Filtration and Separation

Fingerprint

Dive into the research topics of 'A Thermochromic Liquid Crystals Image Analysis technique to investigate temperature polarization in spacer-filled channels for Membrane Distillation'. Together they form a unique fingerprint.

Cite this