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Significance of Truckenbrodt's Energy and Momentum Coefficients for Loss Calculation in Ramified Pipe Systems
Author(s) -
Niessner Herbert,
Codan Ennio
Publication year - 2010
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201010217
Subject(s) - momentum (technical analysis) , energy–momentum relation , yield (engineering) , simple (philosophy) , flow (mathematics) , energy (signal processing) , mechanics , mathematics , statistical physics , physics , thermodynamics , statistics , economics , philosophy , finance , epistemology
For one‐dimensional simulation of flow in ramified pipe systems loss prediction in junctions is essential. In the standard literature (e.g. [1]) total pressure loss coefficients serve this purpose. Elementary formulas follow from the principle of momentum and some simple assumptions [2]. They yield rather crude estimates, often twice as large as experimental values. Modifications described by Idelchik [3] look nice, but after all turn out to be not more accurate. We explain deviations and propose improved loss formula based on Truckenbrodt's energy and momentum coefficients [4], thus paying regard to velocity distributions over pipe cross‐sections. We further discuss extraction of the coefficient's values from experiments. (© 2010 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)