Abstract
The effect of different heater surface configurations on two-phase flow instabilities has been investigated in single channel, forced convection , up-flow and horizontal systems. Freon-11 is used as the test fluid, and different heater tubes with various surface configurations have been tested at different heat inputs. The effect of augmentation on flow instabilities is studied with three different tubes made of different inner surfaces, at various inlet temperatures. All experiments are carried out at constant system pressure and exit restriction. Steady-state characteristics of the system composed of different tubes are found and presented in pressure-drop versus mass flow rate diagrams. Dynamic instabilities, such as pressure-drop-type, density-wave-type instabilities and thermal oscillations are found to occur in every system, and boundaries for the appearance of these oscillations are found. The dependence of the characteristics of these oscillations on the augmented surfaces is emphasized, and comparisons between the bare tube and the augmented tubes are made.
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© 1999 Springer Science+Business Media Dordrecht
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Kakaç, S. (1999). The Effect of Augmented Surfaces on Two-Phase Flow Instabilities. In: Kakaç, S., Bergles, A.E., Mayinger, F., Yüncü, H. (eds) Heat Transfer Enhancement of Heat Exchangers. Nato ASI Series, vol 355. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-9159-1_25
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DOI: https://doi.org/10.1007/978-94-015-9159-1_25
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