Results 1 to 10 of about 1,710,741 (119)

Prediction of Heat Transfer and Fluid Flow Effects on Entropy Generation in a Monolithic Catalytic Converter Using Large-Eddy Simulation

Entropy, 2022
In the present work, heat transfer and fluid flow and their effects on entropy generation in a realistic catalytic converter of a Lada Niva 21214 vehicle are studied using large eddy simulation. At first, the pressure drop over the catalytic converter is
Yongxiang Li, Luis Felipe Rico Cortes, Hardy Hamel, Kaushal Nishad, Luigi Biondo, Florian Ries   +5 more
doaj   +1 more source

Analysis of Local Exergy Losses in Combustion Systems Using a Hybrid Filtered Eulerian Stochastic Field Coupled with Detailed Chemistry Tabulation: Cases of Flames D and E

Energies, 2021
A second law analysis in combustion systems is performed along with an exergy loss study by quantifying the entropy generation sources using, for the first time, three different approaches: a classical-thermodynamics-based approach, a novel turbulence ...
Senda Agrebi, Louis Dreßler, Hendrik Nicolai, Florian Ries, Kaushal Nishad, Amsini Sadiki   +5 more
doaj   +1 more source

Multiparameter Determination of Thin Liquid Urea-Water Films

Applied Sciences, 2021
In this work, wavelengths were determined for the robust and simultaneous measurement of film thickness, urea concentration and fluid temperature. Film parameters such as film thickness, film temperature and the composition of the film are typically ...
Sani van der Kley, Gabriele Goet, Anna Schmidt, Valentina Einspieler, Steven Wagner   +4 more
doaj   +1 more source

Evaluation of the unsteady flamelet progress variable approach in Large Eddy Simulations of the ECN Spray A

Science and Technology for Energy Transition, 2022
Within the Unsteady Flamelet Progress Variable – Large Eddy Simulation (UFPV-LES) approach the local scalar dissipation rate represents one key parameter, significantly affecting the ignition behaviour.
Gierth Sandro, Haspel Philip, Scholtissek Arne, Sun Zhen, Popp Sebastian, Hasse Christian   +5 more
doaj   +1 more source

The Exergy Losses Analysis in Adiabatic Combustion Systems including the Exhaust Gas Exergy

Entropy, 2022
The entropy generation analysis of adiabatic combustion systems was performed to quantify the exergy losses which are mainly the exergy destroyed during combustion inside the chamber and in the exhaust gases. The purpose of the present work was therefore:
Senda Agrebi, Louis Dreßler, Kaushal Nishad   +2 more
doaj   +1 more source

Numerical Prediction of Turbulent Spray Flame Characteristics Using the Filtered Eulerian Stochastic Field Approach Coupled to Tabulated Chemistry

Fluids, 2021
The Eulerian stochastic fields (ESF) method, which is based on the transport equation of the joint subgrid scalar probability density function, is applied to Large Eddy Simulation of a turbulent dilute spray flame.
Louis Dressler, Fernando Luiz Sacomano Filho, Florian Ries, Hendrik Nicolai, Johannes Janicka, Amsini Sadiki   +5 more
doaj   +1 more source

Experimental Investigation of AdBlue Film Formation in a Generic SCR Test Bench and Numerical Analysis Using LES

Applied Sciences, 2021
In this work, an experimental investigation of AdBlue film formation in a generic selective catalytic reduction (SCR) exhaust gas test bench is presented.
Anna Schmidt, Matthias Bonarens, Ilia V. Roisman, Kaushal Nishad, Amsini Sadiki, Andreas Dreizler, Jeanette Hussong, Steven Wagner   +7 more
doaj   +1 more source

Entropy Generation Analysis in Turbulent Reacting Flows and Near Wall: A Review

Entropy, 2022
This paper provides a review of different contributions dedicated thus far to entropy generation analysis (EGA) in turbulent combustion systems.
Amsini Sadiki, Senda Agrebi, Florian Ries   +2 more
doaj   +1 more source

Robust, spatially scanning, open-path TDLAS hygrometer using retro-reflective foils for fast tomographic 2-D water vapor concentration field measurements [PDF]

Atmospheric Measurement Techniques, 2015
We have developed a fast, spatially scanning direct tunable diode laser absorption spectrometer (dTDLAS) that combines four polygon-mirror based scanning units with low-cost retro-reflective foils.
A. Seidel, S. Wagner, A. Dreizler, V. Ebert   +3 more
doaj   +1 more source

Shock-tube study of the ignition and product formation of fuel-rich CH4/ozone/air and natural gas/ozone/air mixtures at high pressure

Applications in Energy and Combustion Science, 2022
The influence of ozone on the ignition delay times and product formation of methane and natural gas was determined in a high-pressure shock tube at fuel-rich conditions (ϕ = 2 and 10), ozone concentrations of 550 ppm, temperatures between 850 and 1700 K ...
Jürgen Herzler, Mustapha Fikri, Christof Schulz   +2 more
doaj   +1 more source