Boiling Heat Transfer in Dilute Emulsions by Matthew Lind Roesle, Francis A. Kulacki
By Matthew Lind Roesle, Francis A. Kulacki
Boiling warmth move in Dilute Emulsions synthesizes contemporary advances and confirmed figuring out with regards to boiling in dilute emulsions. Experimental effects from numerous resources are amassed and analyzed, together with modern experiments that correlate visualization with warmth move information. released types of boiling warmth move in dilute emulsions, and their implementation, are defined and assessed opposed to experimental data.
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Additional resources for Boiling Heat Transfer in Dilute Emulsions
2006), therefore, the phase of the dispersed component cannot be easily determined based on either temperature or other macroscopic properties of the mixture. Thus, the liquid droplets and vapor bubbles must be treated as separate phases. The boiling emulsion is then modeled as a three-phase flow, where boiling and condensation of M. L. Roesle and F. A. 1007/978-1-4614-4621-7_4, Ó The Author(s) 2013 47 48 4 A Model of Boiling in Emulsions the dispersed component results in mass transfer between the droplet and the bubble (vapor) phases.
A key simplifying assumption is that the bubble nucleus forms and remains at the center of the spherical droplet so that spherical symmetry is maintained (Fig. 2a). Each liquid is assumed to be incompressible and have constant properties. The bubble vapor is assumed to obey the ideal gas law, and the temperature and pressure are assumed to be uniform throughout the bubble. A more realistic model would allow for departures from spherical symmetry if the bubble nucleus forms at some point away from the center of the droplet (Fig.
15), dt is the thickness of the thermal boundary layer, A is the heated surface area, and ed is the volume fraction of droplets, so that Adt ed represents the total volume of droplet liquid in the boundary layer. 4 Boiling in Dilute Emulsions 23 Fig. 8 Configuration of Bulanov’s model of boiling in an emulsion (Roesle and Kulacki 2010a) obtained by dividing Eq. 15) by the droplet residence time s. The boiling heat transfer coefficient may therefore be expressed as h ¼ Q=AsðTs À Tsat Þ: Next, Bulanov equates the droplet residence time to the time required for a bubble to rise through the thermal boundary layer due to buoyancy.