Rheological and heat transfer characterizations of non-Newtonian fluid falling film in evaporation process

  • Liu Zhi-jun  (刘志军)Email author
  • Liu Feng-xia  (刘凤霞)
  • Shi Qi-cai  (史启才)
  • Sun Fu-tao  (孙福涛)


A set of experimental equipment was established for falling film evaporation. The aqueous CMC (carboxymethylcellulo) solution was used to simulate the non-Newtonian fluid that obeys the power law model. Effects of rheology of the non-Newtonian fluid on heat transfer were investigated experimentally. A theoretical model was developed and coupling characteristics between rheology and heat transfer were described in non-Newtonian environmental fluid falling film in evaporation process. The different theoretical models were established for the developing region and the fully developed region in this evaporation process, respectively. Using finite difference method and shooting method, the simulated calculations were obtained. Furthermore, by introducing the generalized Reynolds number and the Prandtl number, which includes the necessary physical properties of the non-Newtonian fluid, a correlation about the Nusselt number was proposed for non-Newtonian fluid falling film in evaporation process.

Key words

non-Newtonian fluid rheology heat transfer falling film evaporation 


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Copyright information

© Central South University Press, Sole distributor outside Mainland China: Springer 2007

Authors and Affiliations

  • Liu Zhi-jun  (刘志军)
    • 1
    Email author
  • Liu Feng-xia  (刘凤霞)
    • 1
  • Shi Qi-cai  (史启才)
    • 1
  • Sun Fu-tao  (孙福涛)
    • 1
  1. 1.Department of Chemical MachineryDalian University of TechnologyDalianChina

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