Publisher DOI: 10.1016/j.ijheatfluidflow.2015.06.004
Title: The head change coefficient for branched flows : why "losses" due to junctions can be negative
Language: English
Authors: Schmandt, Bastian 
Herwig, Heinz 
Keywords: Branching;Dissipation;Energy transfer;Junction;Mixer;Negative loss coefficient
Issue Date: Aug-2015
Publisher: Elsevier Science
Journal or Series Name: International journal of heat and fluid flow 
Abstract (english): In this study, the phenomenon of negative "loss"-coefficients reported in various studies about turbulent branched flows through combining junctions is investigated systematically. It turns out, that the "loss" for one branch of a junction and its adjacent ducts only in parts is due to devaluation of mechanical energy, which would be a real loss, so that the term energy change is more appropriate. The other part of the energy change which is not due to a loss is due to a mutual energy transfer between the two partial flows. As a consequence, non-dimensional coefficients should be called energy change coefficients rather than head loss coefficients whenever branching of flows occurs. Furthermore, a method is introduced by which losses and the energy transfer are determined directly in the flow field. The field values allow a quantification and visualization of the local loss and work transfer, while their integral values can be used to quantify the individual contributions of losses and energy transfer within the energy change of a flow through a junction.
URI: http://hdl.handle.net/11420/6227
ISSN: 1879-2278
Institute: Technische Thermodynamik M-21 
Thermofluiddynamik (M-21H) 
Type: (wissenschaftlicher) Artikel
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