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Flow and Heat and Mass Transfer in Laminar and Turbulent Mist Gas-Droplets Stream over a Flat Plate (Paperback, 2014 ed.)
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Flow and Heat and Mass Transfer in Laminar and Turbulent Mist Gas-Droplets Stream over a Flat Plate (Paperback, 2014 ed.)
Series: SpringerBriefs on Multiphase Flow
Expected to ship within 10 - 15 working days
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In this book the author presents selected challenges of
thermal-hydraulics modeling of two-phase flows in minichannels with
change of phase. These encompass the common modeling of flow
boiling and flow condensation using the same expression. Approaches
to model these two respective cases show, however, that
experimental data show different results to those obtained by
methods of calculation of heat transfer coefficient for respective
cases. Partially that can be devoted to the fact that there are
non-adiabatic effects present in both types of phase change
phenomena which modify the pressure drop due to friction,
responsible for appropriate modelling. The modification of
interface shear stresses between flow boiling and flow condensation
in case of annular flow structure may be considered through
incorporation of the so called blowing parameter, which
differentiates between these two modes of heat transfer. On the
other hand, in case of bubbly flows, the generation of bubbles also
modifies the friction pressure drop by the influence of heat flux.
Presented are also the results of a peculiar M-shape distribution
of heat transfer coefficient specific to flow boiling in
minichannels. Finally, some attention is devoted to mathematical
modeling of dryout phenomena. A five equation model enabling
determination of the dryout location is presented, where the mass
balance equations for liquid film, droplets and gas are
supplemented by momentum equations for liquid film and two-phase
core.
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