Publications de Peter Ott | EPFL Graph Search

Celebration of Professor Bernhard Weigand on his 60th birthday

PERGAMON-ELSEVIER SCIENCE LTD2022

Experimental investigation of sequential narrow impingement channels for turbine cooling

Sequentially stacked impingement channels allow for a more effective use of the cooling fluid and can limit the heat transfer reduction due to the crossflow when the number of jets increases. In this paper, sequential impingement channels are experimentall ...

2021

Transient Liquid Crystal Thermography Using a Time Varying Surface Heat Flux

Peter Ott, Alexandros Terzis, Michele Gaffuri

Heat transfer measurements are required in a wide range of fields, for example to validate new cooling concepts in turbomachinery, to assess the performances of heat exchangers, and to provide data for numerical simulations. Thereby transient methods are o ...

2021

Heat Transfer Enhancement in a Double Sequential Impingement Channel

Peter Ott, Michele Gaffuri

Sequential impingement channels can reduce the adverse effect of crossflow in narrow impingement channels, as well as increase the cooling efficiency. In this work, sequential impingement channels are experimentally investigated using the transient liquid ...

2021

Narrow Impingement Channels: Recent Advancements and Future Directions

Peter Ott, Alexandros Terzis, Michele Gaffuri

This paper summarizes the state-of-the-art related to the heat transfer characteristics of narrow impingement cooling channels, which can nowadays be integrated within the external wall of turbine airfoils. Particular emphasis is given to the experimental ...

European Turbomachinery Society2019

Mechanisms of Control Authority by Nanosecond Pulsed Dielectric Barrier Discharge Actuators on Flow Separation

Peter Ott, Pénélope Leyland, Christoforos Skourides, Dimitrios Nyfantis, Hugo Bosse

The mechanisms that should be considered for separation flow control applications of nanosecond pulsed dielectric barrier discharge (DBD) actuators were investigated on a NACA 0015 profile for velocities of 10 m/s (Re = 100, 000) and 20 m/s (Re = 200, 000) ...

2019

Evaluation of Heat Transfer Coefficients for an Impingement Cooling Cascade: Experimental Challenges and Preliminary Results

Peter Ott, Alexandros Terzis, Michele Gaffuri

In this paper, a modification of the widely used transient liquid crystal heat transfer measurement technique for impingement cooling is presented, in which a constant heat flux at the surface is used to drive the experiment, instead of a step change in th ...

2018

Ammonia toxicity: from head to toe?

Peter Ott, Veronika Rackayová

Ammonia is diffused and transported across all plasma membranes. This entails that hyperammonemia leads to an increase in ammonia in all organs and tissues. It is known that the toxic ramifications of ammonia primarily touch the brain and cause neurologica ...

Springer Verlag2017

On the Effects of Coating Thickness in Transient Heat Transfer Experiments Using Thermochromic Liquid Crystals

Peter Ott, Alexandros Terzis, Sebastian Schulz

Transient heat transfer experiments typically employ thermochromic liquid crystals to temporally map surface temperatures. The desired heat transfer coefficient is then calculated from the solution of Fourier’s 1D transient heat conduction equation which i ...

Elsevier2016

OES Characterization of Steamers in a Nanosecond Pulsed SBDB Using N2 and Ar Transitions

Christoph Hollenstein, Peter Ott, Pénélope Leyland, Philip Peschke, Sami Goekce

The characterization of non-thermal homogeneous plasmas is possible using optical emission spectroscopy (OES), notably by estimating the reduced electric field. This method was applied to characterize streamers generated by a nanosecond pulsed surface diel ...

Iop Publishing Ltd2016