Experimental investigation of two phase flow in micro-sized circular tubes

Y. S. Lim, Simon C.M. Yu

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

Single phase and two phase flow characteristics in microsized glass tubes with i.d. (inner diameter) of 300 and 500 mm have been examined experimentally. Single phase pressure drop measurements are found generally in good agreement with Poiseulle flow theory. Transitional flow is found to start earlier at Reynolds number about 1600 as compared to the onset of transitional flow at Reynolds number of 2300 for macro-scale tubes. In addition, these glass tubes are employed for the investigation of adiabatic two phase flow characteristic by introducing gas phase via a stainless steel tube inserted at the center of the glass tube. Real time flow visualization obtained under the same flow condition are analyzed by both cross sectional void fraction (one dimensional drift flux model) and volumetric void fraction (image processing method). The analysis shows that the void fraction estimated by drift flux model (DFM) agrees with homogeneous correlation (a=b) and Armand correlation (a=0.833b). However image processing method seems to reveal that the slip ratio for the two phase flow is more significant and that the void fraction results are clustering between slip ratio of 3 and 7. Additionally, two phase frictional pressure losses are compared with the convention correlation for macro-sized tube (Lockhart-Martinelli model). It is found that measurements of the two phase frictional pressure drop can serve as a flow map to predict the flow patterns when the flow in the channel is not transparent.

Original languageEnglish
Title of host publicationASME 2012 3rd International Conference on Micro/Nanoscale Heat and Mass Transfer, MNHMT 2012
Pages835-843
Number of pages9
DOIs
Publication statusPublished - 1 Dec 2012
Externally publishedYes
EventASME 2012 3rd International Conference on Micro/Nanoscale Heat and Mass Transfer, MNHMT 2012 - Atlanta, GA, United States
Duration: 3 Mar 20126 Mar 2012

Publication series

NameASME 2012 3rd International Conference on Micro/Nanoscale Heat and Mass Transfer, MNHMT 2012

Conference

ConferenceASME 2012 3rd International Conference on Micro/Nanoscale Heat and Mass Transfer, MNHMT 2012
Country/TerritoryUnited States
CityAtlanta, GA
Period3/03/126/03/12

Keywords

  • Flow patterns
  • Microchannel
  • Pressure
  • Two phase flow

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

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