Publications de Eugene van Rooyen

Flow boiling data and prediction method for enhanced boiling tubes and tube bundles with R-134a and R-236fa including a comparison with falling film evaporation

New enhanced boiling tubes from Wolverine Tube Inc. (Turbo-B5) and Wieland-Werke AG (Gewa-B5) were investigated using R-134a and R-236fa as test fluids. The tests were done at saturation temperatures of 5 and 15 degrees C, mass flow rates from 4 to 35 kg m ...

Elsevier Sci Ltd2014

Pressure drop data and prediction method for enhanced external boiling tube bundles with R-134a and R-236fa

John Richard Thome, Eugene van Rooyen

The pressure drops of external flow over enhanced tube bundles were experimentally obtained at both adiabatic and diabatic conditions using R-134a and R-236fa as test fluids. The tests were carried out at saturation temperatures of 5 and 15 degrees C, mass ...

Elsevier2013

Modified Wilson Plots for Enhanced Heat Transfer Experiments: Current Status and Future Perspectives

John Richard Thome, Marcel Christians, Eugene van Rooyen

Heat transfer coefficients for enhanced tubes are typically measured indirectly using the "Wilson plot" method to first characterize the thermal performance of the one side (heating or cooling supply) and then to obtain the heat transfer data for the enhan ...

2012

Boiling on a Tube Bundle: Part II-Heat Transfer and Pressure Drop

John Richard Thome, Navid Borhani, Francesco Agostini, Eugene van Rooyen

An extensive experimental study was undertaken to measure nucleate pool boiling heat transfer coefficients, local bundle boiling heat transfer coefficients, and two-phase bundle pressure drops for R134a and R236fa on one plain tube bundle configuration. Th ...

2012

Boiling on a Tube Bundle: Part I-Flow Visualization and Onset of Dryout

John Richard Thome, Navid Borhani, Francesco Agostini, Eugene van Rooyen

A novel visualization method was developed and implemented in a refrigerant-flooded evaporator tube bundle. Specifically, a method to visualize the two-phase flow inside plain tube bundles was developed using a dummy tube with a tubular glass section for v ...

2012

Boiling on a Tube Bundle : Heat Transfer, Pressure Drop and Flow Patterns

Eugene van Rooyen

The complexity of two-phase flow boiling on a tube bundle presents many challenges to the understanding of the physical phenomena taking place. It is important to quantify these numerous heat flow mechanisms in order to better describe the performance of t ...

EPFL2011