Nucleate boiling heat transfer of binary mixtures at low to moderate heat fluxes
- Indian Inst. of Tech. Madras, Chennai (India). Dept. of Chemical Engineering
Nucleate boiling is characterized by the formation of vapor at preferred sites (nucleation sites) on a heating surface that is submerged in the liquid and maintained at a temperature above the saturation temperature of the liquid. In the present study, a model has been developed for pool boiling of binary mixtures based on an additive mechanism. Nucleate pool boiling of binary mixtures finds many applications in the refrigeration and air conditioning industry, the chemical process industries, such as the liquid natural gas industry, and in the reboilers of distillation columns among others. Here, a model for nucleate pool boiling heat transfer of binary mixtures has been proposed based on an additive mechanism. The contributing modes of heat transfer are (i) the heat transferred by microlayer evaporation, (ii) the heat transferred by transient conduction during the reformation of the thermal boundary layer, and (iii) the heat transferred by turbulent natural convection. The model takes into account the microroughness of the heating surface which has been defined quantitatively. The model compares satisfactorily with data obtained in the present study and in the literature. These data were obtained on a variety of heating surfaces such as a vertical platinum wire, a horizontal stainless steel tube and flat horizontal aluminium, and stainless steel surfaces (with various surface finishes) thereby demonstrating the validity of the model.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 361754
- Journal Information:
- Journal of Heat Transfer, Vol. 121, Issue 2; Other Information: PBD: May 1999
- Country of Publication:
- United States
- Language:
- English
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