Publication
Adiabatic vertical downward air-water flow pattern map: influence of inlet device, flow development length and hysteresis effects
Related publications (35)
A method to visualise near wall fluid flow patterns using locally resolved convective heat transfer experiments
Peter Ott, Alexandros Terzis, Bernhard Weigand
The present study demonstrates an alternative approach for describing fluid flow characteristics very close to the wall, using locally resolved convective heat transfer experiments. Heat transfer coefficients on the base surface and around a surface mounted v ...
Elsevier2015Thermo-Hydrodynamics in a Closed Loop Pulsating Heat Pipe
Pulsating heat pipes (PHPs) represent a promising solution for passive on-chip, two-phase cooling of micro-electronics, providing advantages such as a simple construction and operation in any gravitational orientation. Unfortunately, the unique coupling of ...
EPFL2014High Voltage Pulsed DBD Effects on the Aerodynamic Performances and on the Shock Buffet
Christoph Hollenstein, Peter Ott, Pénélope Leyland, Philip Peschke
The applications of surface dielectric barrier discharge plasma actuators, (DBD), have known a considerable interest recently in the field of flow control. In general, such actuators consist of two electrodes separated by an insulation covering the lower e ...
2013Measurements of the pore-scale water flow through snow using Fluorescent Particle Tracking Velocimetry
Michael Lehning, Benjamin Andreas Walter
Fluorescent Particle Tracking Velocimetry (FPTV) measurements of the pore-scale water flow through the pore space of a wet-snow sample are presented to demonstrate the applicability of this measurement technique for snow. For the experiments, ice-cooled wa ...
American Geophysical Union2013Forced reattachment in separated flows: a variational approach to recirculation length reduction
François Gallaire, Edouard Boujo
Sensitivity analysis is used to design an open-loop control for separated flows. The length of the recirculation region is expressed as a cost functional, and its sensitivity to actuation is derived analytically. This analysis allows to identify regi ...
2013Characterization of Annular Two-Phase Down Flow Using Non Intrusive Optical Techniques for Flow Patterns, Entrainment, Film Thickness and Velocity Profile
In this study, adiabatic vertical cocurrent downward air-water flow in an 8.8 mm internal diameter channel was investigated using non intrusive optical techniques. Flow pattern tests were performed to assess the influence of the inlet device, of the test s ...
EPFL2012Wind Tunnel Studies of Shear Stress Partitioning in Live Plant Canopies
The earth's surface is permanently exposed to the atmosphere and accordingly to strong wind forces in many regions. Aerodynamic entrainment, transport and redeposition of sand, soil or snow are able to considerably reshape the surface morphology and influe ...
EPFL2012A 3D ALE Finite Element Method for Two-Phase Flows with Phase Change
A new numerical method is proposed to study two-phase flow and heat transfer for interlayer cooling of the new generation of multi-stacked computer chips. The fluid flow equations are developed in 3-dimensions based on the Arbitrary Lagrangian-Eulerian for ...
EPFL2012Analytical method to predict two-phase flow pattern in horizontal micro-capillaries
Albert Renken, Lioubov Kiwi, Madhvanand Namadeo Kashid
An a priori prediction of multiphase flow pattern in micro-capillaries or microstructured reactors (MSR) is required for their rational design. The state-of-the-art numerical models require huge computational efforts. In the present work, an analytical mod ...
2012Investigation on the Three-Dimensional Flow Mechanisms in Annular Axial Compressor Cascades for Aero Engines with Flow Control by Aspiration on the Hub and on the Blades
The axial compressor is an essential component of aero-engines and gas turbines. This work investigates how flow control by aspiration applied to the hub and to the blades of axial compressor wheels can improve the static pressure rise by preventing detrim ...
EPFL2011