Correlations of the droplet size-velocity of the two-phase, air/liquid spray using a particle-dynamic-analyzer

Azizur Rahaman, Johana Gomez, Ted Heidrick, Brian A. Fleck, Jennifer McMillan

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

2 Citations (Scopus)

Abstract

In the heavy oil process industry preheated bitumen and steam are mixed upstream of the feed nozzle and subsequently injected into fluid bed coker reactors via feed nozzles. To achieve high liquid product yields, the bitumen should contact a large number of fluidized coke particles quickly and uniformly. One of the drawbacks of the spray issuing from the nozzle is the potential pulsation within the spray and in the feeding conduit, which is highly undesirable to yield high productivity. These pulsations result in poor atomization and in most instances, a slug of liquid is ejected out of the nozzle. It would be valuable to investigate under which two-phase fluid conditions this pulsation aggravates. It would also be beneficial to examine the detailed spray map with changing air-to-liquid ratio (ALR) by mass and void fraction (a). The average void fraction in the feeding conduit was measured by a pneumatic controlled quick-closing-valve (QCV). The length and diameter of the feeding conduit was 36.8 cm and 6.35 mm, respectively. The experiments were performed using mixtures of air with water at water flow rates of 1.50 to 7.50 kg/min and air-to-liquid (ALR) mass ratios of 0.30 to 9.3 %. This study indicates that there exists a strong positive correlation between the droplet diameter and axial velocity at the center of the spray. A positive correlation also exists in between the spray center and periphery. However, a strong negative correlation exists at the periphery of the spray. Knowledge from this study would help the heavy oil process industry to upgrade their heavy oil upgrading process and increase the product yield.

Original languageEnglish
Title of host publication2008 Proceedings of the ASME Fluids Engineering Division Summer Conference, FEDSM 2008
Pages699-706
Number of pages8
Volume1
EditionPART A
DOIs
Publication statusPublished - 2009
Externally publishedYes
Event2008 ASME Fluids Engineering Division Summer Conference, FEDSM 2008 - Jacksonville, FL, United States
Duration: 10 Aug 200814 Aug 2008

Other

Other2008 ASME Fluids Engineering Division Summer Conference, FEDSM 2008
CountryUnited States
CityJacksonville, FL
Period10/8/0814/8/08

    Fingerprint

Keywords

  • Air-to-liquid-ratio
  • Phase- particle-dynamic-analyzer
  • Sauter mean diameter
  • Spray profile
  • Two-phase flow
  • Void fraction

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Mechanical Engineering

Cite this

Rahaman, A., Gomez, J., Heidrick, T., Fleck, B. A., & McMillan, J. (2009). Correlations of the droplet size-velocity of the two-phase, air/liquid spray using a particle-dynamic-analyzer. In 2008 Proceedings of the ASME Fluids Engineering Division Summer Conference, FEDSM 2008 (PART A ed., Vol. 1, pp. 699-706) https://doi.org/10.1115/FEDSM2008-55330