Journal article

Energy loss and developing length during reciprocating flow in a pipe with a free-end

MK Hasan, R Manasseh, JS Leontini

Physics of Fluids | American Institute of Physics | Published : 2020

Abstract

Direct numerical simulations of reciprocating pipe flow in a straight pipe with a free-end are presented. The range of amplitudes and frequencies studied span the laminar regime and the beginning of transition toward a conditionally turbulent flow. Two primary results are reported: the measurement of the flow development length and the loss of energy, both due to the presence of the free-end. Two regimes of flow are identified with distinct length scales. For low frequencies, the development length scales with the pipe diameter D. However, for higher frequencies, the development length scales with the Stokes layer thickness δ=2ν/ω. The energy loss is studied by calculating the viscous dissip..

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University of Melbourne Researchers