Pressure Drop of HFE7000 and HFE7100 in Flow Condensation in Minichannels With Account of Non-Adiabatic Effects
1 Gdansk University of Technology, Faculty of Mechanical Engineering, Gdansk, Poland
2 The Szewalski Institute of Fluid-Flow Machinery PAS, ul. Fiszera 14, 80-231 Gdansk, Poland
Flow boiling and flow condensation are often regarded as two opposite or symmetrical phenomena involving the change of phase. There is a temptation to describe both these phenomena with one only correlation. From amongst the structures present in flow boiling and flow condensation at least the annular flow structure seems to be mostly appropriate to the common modeling. However, the shear stress acting between vapor phase and liquid phase is not the same in the respective cases, i.e. flow boiling and flow condensation. Most of modeling of heat transfer in case of condensation inside channels relates the heat transfer coefficient to the friction coefficient. All existing approaches are either the empirical fits to experimental data or form an attempt to combine two major influences to heat transfer, namely the convective flow boiling without bubble generation and nucleate boiling. In the paper the authors present investigations of flow condensation with the use of the HFE7100 and HFE 7000 as a working fluids and their own condensation model inside tubes with account of non-adiabatic effects. The model will be confronted with own data for a new fluid HFE7000 and HFE 7100.
© Owned by the authors, published by EDP Sciences, 2014
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