Heat transfer in spacer-filled channels of the kind used in Membrane Distillation was studied in the Reynolds number range 100–2000, encompassing both steady laminar and early-turbulent flow conditions. Experimental data, including distributions of the local heat transfer coefficient h, were obtained by Liquid Crystal Thermography and Digital Image Processing. Alternative turbulence models, both of first order (k-ε, RNG k-ε, k-ω, BSL k-ω, SST k-ω) and of second order (LRR RS, SSG RS, ω RS, BSL RS), were tested for their ability to predict measured distributions and mean values of h. The best agreement with the experimental results was provided by first-order ω-based models able to resolve the viscous/conductive sublayer, while all other models, and particularly ε-based models using wall functions, yielded disappointing predictions.

Ciofalo M., Di Liberto M., La Cerva M., Tamburini A. (2019). Turbulent heat transfer in spacer-filled channels: Experimental and computational study and selection of turbulence models. INTERNATIONAL JOURNAL OF THERMAL SCIENCES, 145, 106040 [10.1016/j.ijthermalsci.2019.106040].

Turbulent heat transfer in spacer-filled channels: Experimental and computational study and selection of turbulence models

Ciofalo M.
;
Di Liberto M.;La Cerva M.;Tamburini A.
2019-01-01

Abstract

Heat transfer in spacer-filled channels of the kind used in Membrane Distillation was studied in the Reynolds number range 100–2000, encompassing both steady laminar and early-turbulent flow conditions. Experimental data, including distributions of the local heat transfer coefficient h, were obtained by Liquid Crystal Thermography and Digital Image Processing. Alternative turbulence models, both of first order (k-ε, RNG k-ε, k-ω, BSL k-ω, SST k-ω) and of second order (LRR RS, SSG RS, ω RS, BSL RS), were tested for their ability to predict measured distributions and mean values of h. The best agreement with the experimental results was provided by first-order ω-based models able to resolve the viscous/conductive sublayer, while all other models, and particularly ε-based models using wall functions, yielded disappointing predictions.
Settore ING-IND/19 - Impianti Nucleari
Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi Chimici
http://www.journals.elsevier.com/international-journal-of-thermal-sciences/
Ciofalo M., Di Liberto M., La Cerva M., Tamburini A. (2019). Turbulent heat transfer in spacer-filled channels: Experimental and computational study and selection of turbulence models. INTERNATIONAL JOURNAL OF THERMAL SCIENCES, 145, 106040 [10.1016/j.ijthermalsci.2019.106040].
File in questo prodotto:
File Dimensione Formato  
Final_preprint.pdf

Solo gestori archvio

Tipologia: Post-print
Dimensione 5.84 MB
Formato Adobe PDF
5.84 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Turbulent heat transfer in spacer-filled channels_ Experimental and computational study and selection of turbulence models _ Elsevier Enhanced Reader.pdf

Solo gestori archvio

Descrizione: Versione editoriale
Tipologia: Versione Editoriale
Dimensione 6.01 MB
Formato Adobe PDF
6.01 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/393450
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 9
  • ???jsp.display-item.citation.isi??? 5
social impact