On the interaction of boundary layer and mixing layer in stratified pipe flow

Elia Merzari, Paul Fischer, W. David Pointer, Marco Pellegrini, Hisashi Ninokata

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Stratified pipe flow in a pipe has been the subject of several investigations over the years. In fact it is relevant to the operation of thermal energy systems involving significant temperature gradients and low flow conditions. Stratification affects mixing, and is one the key phenomena that need to be addressed in the design of any mixing system of devices involving significant density difference. In order for thermal stratification in a pipe to be correctly modeled the underlying hydrodynamic behavior related to the mixing of two streams in a pipe needs to be fully understood. The present paper deals with the numerical simulation of the flow in a pipe where the bottom half has a lower velocity compared to the upper half. A turbulent mixing layer develops in the streamwise direction at the interface between low flow region and higher flow region. Since the Reynolds number is low, the boundary layer and the mixing layer are about the same size. This translates in non trivial interactions between the structures in the boundary layer and the mixing layer. The failure of RANS models in accounting for the mixing points in this direction. An LES of the flow in this geometry has been performed with the spectral code Nek5000. The averaged statistics have been compared with available experimental results. Proper Orthogonal Decomposition has been applied to clarify outstanding issues in RANS modeling.

Original languageEnglish (US)
Title of host publicationASME 2012 Fluids Engineering Division Summer Meeting Collocated with the ASME 2012 Heat Transfer Summer Conf. and the ASME 2012 10th Int. Conf. on Nanochannels, Microchannels, and M, FEDSM 2012
Pages767-773
Number of pages7
EditionPARTS A AND B
DOIs
StatePublished - Dec 1 2012
EventASME 2012 Fluids Engineering Division Summer Meeting, FEDSM 2012 Collocated with the ASME 2012 Heat Transfer Summer Conf. and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and M, FEDSM 2012 - Rio Grande, Puerto Rico
Duration: Jul 8 2012Jul 12 2012

Publication series

NameAmerican Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM
NumberPARTS A AND B
Volume1
ISSN (Print)0888-8116

Other

OtherASME 2012 Fluids Engineering Division Summer Meeting, FEDSM 2012 Collocated with the ASME 2012 Heat Transfer Summer Conf. and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and M, FEDSM 2012
CountryPuerto Rico
CityRio Grande
Period7/8/127/12/12

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

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