PRESSURE LOSS COEFFICIENT OF LAMINAR FLOW ACROSS 30°, 45° AND 60° MINI MITRE BENDS

Wameedh T.M.  Al-Tameemi; Mohammed Ridha Jawad  Al-Tameemi; Ahmed Jameel  Khudhair

doi:10.30572/2018/KJE/160417

Authors

Wameedh T.M. Al-Tameemi Department of Architectural Engineering, University of Diyala, 32001 Diyala, Iraq
Mohammed Ridha Jawad Al-Tameemi Department of Mechanical Engineering, University of Diyala, 32001 Diyala, Iraq
Ahmed Jameel Khudhair Middle Technical University (MTU), Technical Institute of Baquba, Diyala, Iraq

DOI:

https://doi.org/10.30572/2018/KJE/160417

Keywords:

Laminar flow, Mini pipes, Minor losses, Mitre bends, Pressure loss coefficient

Abstract

Pressure loss coefficient of laminar flow across 30°, 45° and 60° mini scale mitre bends investigated for the first time by using CFD simulation. Various flow velocities between 0.05 and 2.2 m/s and three different pipes’ diameters 1, 2 and 3mm were used to obtain laminar flow with Reynolds numbers range between 150 and 2190 for each mitre angle. More than one hundred case studies were used in the study. The extracted data from the simulation were employed to compute the key values theoretically for each case. The friction factor results of the present work agrees with the experimental values from the literature with less than ±5 % average error. The obtained data of mitre bends’s pressure drop illustrate the independency of the Pressure coefficient K on both of the flow Reynolds numbers and the pipe diameter for the employed pipe sizes and flow conditions. The results obtained from this work verify the independent influence of the mitre angle on the pressure loss coefficient. New values of pressure loss coefficient for mini mitre bends are found, and they have 39-59% larger values than those for normal size mitre conduits

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