Lagrangian characterization of multi-phase turbulent flow in a solar reactor for particle deposition prediction

Nesrin Ozalp, Anoop Baby

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Solar cracking of methane is a promising technology for emission free hydrogen production. One of the major problems affecting methane cracking solar reactors' performance is the carbon particle deposition on the window, walls, and at the exit. In present study, a Lagrangian particle dispersion model has been implemented for predicting the particle deposition on the window of a seeded solar thermal reactor. A three-dimensional Computational Fluid Dynamics (CFD) analysis using Discrete Phase Model (DPM) has been done for qualitative validation of the experimental observations. In order to evaluate the turbulent quantities in the solar reactor; RNG k-ε model has been applied. Species transport has been solved by taking the gas for window screening as different from that used in the main flow. In addition, this paper presents a thorough parametric study predicting the particle deposition on reactor window for various flow configurations and flow conditions, which can be summarized as; (1) when the inlet flow angle is smaller, higher tangential velocities or swirl strength is obtained, (2) higher tangential velocities help in maintaining a stronger swirl, which keeps the screening flow close to the reactor window, (3) by increasing the main flow and the screening flow rates, the particle deposition on window is reduced, (4) when a lower density fluid is used as window screening gas, the particle deposition is reduced because the Taylor instabilities are avoided. The CFD work and the findings presented in this paper would be used as a guide in designing a solar reactor or improving the configuration of existing reactor.

Original languageEnglish
Pages (from-to)4496-4507
Number of pages12
JournalInternational Journal of Hydrogen Energy
Volume35
Issue number10
DOIs
Publication statusPublished - May 2010

Fingerprint

turbulent flow
Turbulent flow
reactors
Screening
predictions
screening
Computational fluid dynamics
Methane
computational fluid dynamics
Inlet flow
methane
thermal reactors
Hydrogen production
Gases
inlet flow
Dynamic analysis
Taylor instability
hydrogen production
Flow rate
configurations

Keywords

  • Carbon deposition
  • CFD
  • Hydrogen
  • Methane cracking
  • Solar reactor

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

Lagrangian characterization of multi-phase turbulent flow in a solar reactor for particle deposition prediction. / Ozalp, Nesrin; Baby, Anoop.

In: International Journal of Hydrogen Energy, Vol. 35, No. 10, 05.2010, p. 4496-4507.

Research output: Contribution to journalArticle

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