0
Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Effect of Reynolds Number on Deposition in Fuels Flowing Over Heated Surfaces

[+] Author and Article Information
Clifford Moses

Southwest Research Institute,
555 Magazine Avenue,
New Braunfels, TX 78132
e-mail: cmoses4@me.com

1Retired.

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received June 26, 2013; final manuscript received July 15, 2013; published online September 20, 2013. Editor: David Wisler.

J. Eng. Gas Turbines Power 135(12), 121503 (Sep 20, 2013) (9 pages) Paper No: GTP-13-1185; doi: 10.1115/1.4025147 History: Received June 26, 2013; Revised July 15, 2013

An increasing demand is being put on the fuel as a heat sink in modern aircraft. In the end, the fuel flows through the atomizer, which is both the hottest part in the thermal history of the fuel and the most critical for resisting deposition. Most studies have concentrated on the chemistry of deposition and in recent years there have been modeling efforts. Deposition is really the end product of a coupling between heat transfer to the fuel, chemical reactions to form insoluble gums, followed by the transport of these gums to the surface to form deposits. There is conflicting evidence and theory in the literature concerning the effect of turbulence on deposition, i.e., whether deposition increases or decreases with increasing Reynolds number. This paper demonstrates, through a heat transfer analysis, that the effect of the Reynolds number depends upon the boundary/initial conditions. If the flow is heated from the surface, deposition decreases with increasing Reynolds number; however, for isothermal flows, i.e., preheated, deposition can increase with the Reynolds number.

Copyright © 2013 by Rolls-Royce plc
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 1

Fuel deposition mechanisms

Grahic Jump Location
Fig. 2

Effect of Re on deposition, according to Chin and Lefebvre [9]

Grahic Jump Location
Fig. 3

Swirl slots in typical simplex pressure atomizer

Grahic Jump Location
Fig. 4

The Re effects on fuel deposition in a heated tube; 0.39 cm flow diameter

Grahic Jump Location
Fig. 5

The Re effects on fuel deposition in a heated tube; 0.053 cm flow diameter

Grahic Jump Location
Fig. 6

Regions of turbulent flow in a smooth duct

Grahic Jump Location
Fig. 7

Effect of the Reynolds number on the boundary layer thickness

Grahic Jump Location
Fig. 8

Effect of the Reynolds number on the velocity profile in the laminar sublayer

Grahic Jump Location
Fig. 9

Effect of the Reynolds number on the temperature profile in the boundary region

Grahic Jump Location
Fig. 14

Temperature profiles for both laminar and turbulent flows

Grahic Jump Location
Fig. 13

Brownian motion leading to deposition

Grahic Jump Location
Fig. 12

Trajectories of the deposit precursors

Grahic Jump Location
Fig. 11

Summation of the precursor mass

Grahic Jump Location
Fig. 10

Formation rate of deposit precursors within the laminar sublayer

Grahic Jump Location
Fig. 15

Example of the variation of the diffusion coefficient across the laminar sublayer

Grahic Jump Location
Fig. 16

Example profile of the average diffusion velocity of the precursor particle

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In