The document discusses a new diagram for predicting two-phase flow patterns that was created by the author as an improvement over the commonly used Baker-Plot method. The Baker-Plot uses parameters along the axes that are not dimensionless, so the boundaries for predicting flow patterns change based on fluid properties and tube dimensions. The author developed a new plot in the 1970s using dimensionless parameters and published the results, but still found colleagues using the Baker-Plot method in 2000. The conclusion is that the new plot provides a better prediction of flow patterns, even for non-adiabatic flows.

1. New Diagram for Prediction of Two Phase Flow Ir. Martin F.G. van der Jagt 5 jan 2010

2. The Baker-Plot is the most used plot for the prediction of Two-Phase Flow patterns. An amazing disadvantage of this plot is the fact that the parameters along the axis are not dimensionless! So the boundaries for the patterns will change location depending on gas-and liquid properties and the tube dimensions. Starting in 1971 I tried to understand the Flow-patterns in horizontal Evaporator tubes of refrigeration plants. I first started to use the Baker-Plot, but discovered the problem.

3. I created a new plot based on dimensionless parameters. I published the results at the 1975 XIV International Congress of Refrigeration in Moscow. In 2000 I discovered that me young colleges were still using the Baker-Plot. In this presentation I will introduce the New Two-Phaseflow prediction Plot

14.  Parameter in the Baker-Plot  Parameter in the Baker-Plot Symbols(1)  = density kg/m 3  = surface tension N/m  m = massflowrate kg/s  = dynamic viscosity kg/(m.s) D = tubediameter m

15. Symbols (2) Fr = Froude number Wb = Weber number = V G 2 /(g.D) = D.  G .V G 2 /  Re G = Reynolds number for the gas =  .D.V G /  V = velocity m/s V G = defined as  G /A A = surface of tube cross-section m 2 g = acceleration of gravity m/s 2