Design of thermophoretic probe for precise particle sampling

Lee, Jeong-Hoon; Altman, Igor; Choi, Mansoo

doi:10.1016/j.jaerosci.2008.01.001

Cited by 49 publications

(39 citation statements)

References 23 publications

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“…By increasing the rigidity of the probe and reducing the flow perturbation, they were able to detect the soot growth along the flame, with better control as compared to the perturbed case. However, in the coflow flames adopted in [18] and [19], sampling locations are on the order of a few millimeters apart, which makes their approach incompatible with the present flames whose overall soot layer thickness is on the order of one mm, and decreases as pressure increases as p -1/2 . Thus, a much better spatial resolution is required.…”

Section: Development Of the Soot Sampling Proceduresmentioning

confidence: 92%

“…We thus explored thermophoretic sampling to measure particle size distribution and study soot morphology [18]. Lee et al [19] showed in a coflow flame that sampling by quick insertion and retraction of a TEM grid produces large flow perturbations and a certain degree of mixing, resulting in poor spatial sampling resolution. By increasing the rigidity of the probe and reducing the flow perturbation, they were able to detect the soot growth along the flame, with better control as compared to the perturbed case.…”

Section: Development Of the Soot Sampling Proceduresmentioning

confidence: 99%

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Computational and Experimental Study of the Structure of Diffusion Flames of Jet Fuel and Its Surrogates at Pressures up to 40 ATM

Smooke¹,

Gomez²

2012

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. (From -To) REPORT DATE (DD-MM-YYYY) 21-11-2012 REPORT TYPE Final Technical DATES COVERED SPONSOR/MONITOR'S REPORTSuite 325, Room 3112 NUMBER(S)Arlington VA 22203-1768 DISTRIBUTION / AVAILABILITY STATEMENTApproved for public release. Distribution is unlimited. SUPPLEMENTARY NOTES ABSTRACTDespite considerable progress made in computational fluid mechanics, chemical kinetics and soot processes in recent years, the study of complex fuels in gas turbine engines, including soot processes is still a daunting task and will remain so for the foreseeable future. Traditionally, the combustion community has chosen either to focus on the fluid mechanics of real engines with simplified chemical kinetics or to study simple laminar flames with detailed kinetics and transport. This dichotomy is a necessity as the level of computer power needed to solve the complete engine/chemistry problem will not be available for years to come. The challenge is even greater, to the point of being unrealistic, if complex fuels and soot are to be included. Our research program has the realistic objective of examining the structure of gaseous laminar diffusion flames perturbed by the addition of a few thousand ppm of complex fuels such as: higher alkanes and aromatics, their combination in jet fuel surrogates and, ultimately jet fuel itself. The aim is to study their flame structure and soot behavior in the entire pressure range of relevance to modern gas turbines, that is, 1-40 atm. A counterflow diffusion flame is selected as an optimal environment for the research due to the suppression of buoyancy instabilities that typically plague coflow flames at high pressures, the unparalleled level of control that it provides on the soot formation process, and the opportunity of modeling the system as one-dimensional, which is advantageous for fuels with a very large chemical mechanism, such as JP-8. SUBJECT TERMS Status of Effort/ObjectivesDespite considerable progress made in computational fluid mechanics, chemical kinetics and soot processes in recent years, the study of complex fuels in gas turbine engines, including soot processes is still a dau...

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Section: Development Of the Soot Sampling Proceduresmentioning

confidence: 92%

Section: Development Of the Soot Sampling Proceduresmentioning

confidence: 99%

Computational and Experimental Study of the Structure of Diffusion Flames of Jet Fuel and Its Surrogates at Pressures up to 40 ATM

Smooke¹,

Gomez²

2012

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“…We followed a study of Lee et al [41] to fabricate the thermophoretic probe. Lee et al [41] reviewed thermophoretic sampling techniques and proposed an improved design for sampling with high spatial resolution.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…Lee et al [41] reviewed thermophoretic sampling techniques and proposed an improved design for sampling with high spatial resolution. Lee et al [41] have shown that probe construction can significantly affect the precision of particle sampling in flame. Approach of Lee et al [41] with modifications described below allowed us to make an efficient probe that minimally disturbs the flame when collecting particles.…”

Section: Methodsmentioning

confidence: 99%

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Size distribution of silica nanoparticles: its impact on green energy

Dutka¹,

Turkin

Vainchtein³

et al. 2016

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1The kinetics of formation of silica fractal-like aggregates during combustion of a stoichiometric methane/air mixture with the hexamethyldisiloxane admixture is studied. Oxidation of hexamethyldisiloxane proceeds very fast with formation of SiO 2 molecules and compact silica clusters at a height of a few millimeters above the burner. At a sufficiently high concentration of hexamethyldisiloxane random collisions of nanoparticles leads to agglomerates with fractal-like structure. The transmission electron microscopy is combined with the theoretical analysis to find conditions for formation of silica fractal-like aggregates. The onset of fractal aggregate formation is discussed by studying the characteristic time scales of collisions and coalescence. One dimensional model is formulated to describe the evolution of the size distribution of fractal-like silica particles undergoing generation, convection, sintering and Smoluchowski coagulation. The simulation results are compared to experimental data.

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