A numerical study on condensation heat transfer and pressure drop characteristics of low-pressure vapor in a plate heat exchanger
2020
In this work, the condensation heat transfer and pressure drop
characteristics of plate heat exchangers were simulated, and the
threedimensional temperature, pressure, and velocity fields were
obtained. From the flow field, we can see that the velocity of vapor is higher
than that of condensate. From the pressure field, we can see that the
pressure shows a downward trend along the flow direction, and there is,
the more pressure drop in the first half of the plate. From the temperature
field, we can see that the temperature gradient increases with the increase
of velocity and pressure gradient. Meanwhile, the effect of vapor mass
flow, dryness and superheat on condensation heat transfer coefficients and
pressure drops were investigated. The results show that the pressure drop and
heat transfer coefficient both increase with the increase of dryness, degree
of superheat and mass flow. In addition, the correlation equations developed
to predict the condensation heat transfer and friction factor perfectly agree
with the experimental results.
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