An experimental study of the thermal rebound effect of nanometer aerosol particles

Skaptsov, A.S.; Baklanov, A.; Dubtsov, S.N.; Laulainen, N. S.; Sem, Gilmore J.; Kaufman, Stanley L.

doi:10.1016/0021-8502(96)00145-0

Cited by 9 publications

(2 citation statements)

References 5 publications

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“…In another filtration efficiency study, eight stages of wire screens were used to filter out tested tungsten oxide and molybdenum oxide particles, and the thermal rebound effect was not observed (Skaptsov et al, 1996). These particles are harder than NaCl particles and may exhibit elastic impaction; however, rebounded particles may also be captured by other stages.…”

Section: Experimental Workmentioning

confidence: 99%

An Overview of Airborne Nanoparticle Filtration and Thermal Rebound Theory

Givehchi

Tan

2014

Aerosol Air Qual. Res.

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This paper provides an overview of recent studies on the filtration of airborne nanoparticles. Classical filtration theory assumes that the efficiency of nanoparticle adhesion is at unity when nanoparticles strike a filter with a Brownian motion. However, it has been pointed out that small nanoparticles may have a sufficiently high impact velocity to rebound from the surface upon collision, a mechanism called thermal rebound. According to thermal rebound theory, the adhesion efficiency of nanoparticles decreases if their size is reduced. However, this phenomenon has not yet been clearly observed in experimental studies; there are still a number of uncertainties associated with the concept of thermal rebound, which is yet to be either proven or disproven. This review paper discusses the findings in the current literature related to thermal rebound theory.

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Section: Experimental Workmentioning

confidence: 99%

An Overview of Airborne Nanoparticle Filtration and Thermal Rebound Theory

Givehchi

Tan

2014

Aerosol Air Qual. Res.

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“…Il existe deux dispositifs qui permettent de le faire, l'ADME et le SMEC. et BAKLANOV 1996, DUBSTOV et al 1996 …”

Section: Générateu R Nanométriqueunclassified

Les nanoparticules dans l'air, génération, détection et granulométrie

Attoui¹

1997

Pollution Atmosphérique

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RÉSUMÉL'aérosol nanométrique est présent dans l'air atmosphérique en concentrations élevées. Il résulte essentiellement de la conversion gaz-particules. L'aérosol radioactif naturel (descendants du radon) sous forme libre est lui aussi de dimensions nanométriques et même subnanométriques. On rencontre également l'aérosol nanométrique dans un certain nombre d'industries telles ; fours électriques, combustion, réacteurs chimiques pour matériaux synthétiques, décharges élec-trostatiques, nanostructures, céramiques et frittés, nouveaux matériaux à nanostructures etc. Dans cet article, nous passons en revue les méthodes de génération, de détection et de mesure de la granulométrie de cet aéro-sol.

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Developed turbulent transport in ducts for large prandtl or schmidt numbers

Hanna¹,

Sandall²

1972

AIChE Journal

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The problem of developed turbulent heat or mass transfer in a duct is considered for the limit of large u (Prandtl or Schmidt number). The limiting results depend on the behavior of the eddy diffusivity near the solid surface. Since there is a question about whether this variation begins with e a y + 3 + . . . or e cc y+4 + . . . for y * near zero, both possibilities are considered. In each case the first three terms of the asymptotic expansion for u + co Heat or mass transfer under developed conditions for turbulent flow in ducts has long been of practical interest. This is true since for many transport situations in turbulent flow the temperature or concentration achieves its developed profile over most of the transfer region. The particular case where u -+ m has been of special interest both theoretically and in practice, since for heat or mass transfer in many liquids the u values are large.Early work on this problem was based on the analogies of Prandtl-Taylor, von Khrman, and Martinelli (8). The differences between these analogies are attributable to various simplifying assumptions made by the authors. Subsequently, Lyon (10) and Seban and Shimazaki ( 1 1 ) presented analyses which were devoid of simplifying assumptions, but which could only be implemented numerically. The main purpose of this paper is the development of an asymptotic expansion for the rigorous formulation in the limit of u + m.Deissler (2) used the idea of a continuously varying eddy diffusivity to determine an analytical approximation for the Stanton number in a circular tube for the limit of u -+ 5 c . Later Elrod ( 3 ) showed that the Taylor series expansion for the eddy diffusivity in the neighborhood of the wall must begin with a term proportional to y" where n must be greater than or equal to three. The asymptotic dependence of the Stanton number on u for u + cc depends on this value of n. Empirical correlations based on values of n of three ( 4 , 9) and four (2, 1 2 ) have been proposed, mainly of the form S t = A Rea ub. In addition, a number of large Schmidt number mass transfer experiments have been conducted with the goal of determining n. These investigations are not conclusive, since evidence is found for both la = 3 (6, 7) and n = 4 ( 1 2 ) . Part of the reason for this discrepancy may be due to an inadequate formula with which to compare the experimental results.In this paper we derive an asymptotic expansion of the Lyon equation for the limit of u -+ m. The expansion depends in a fundamental way on the eddy diffusivity variation near the wall. Since this variation is currently in quesAlChE Journal (Vol. 18, No. 3) large Schmidt number tion, both of the likely possibilities are considered. Three terms of the asymptotic expansion are generated for both c(!/+) = K3y+3 + K4y+4 + K5y+5 and ~( y ' ) = M4y+' + kfj!y+5 + A!fG!/+'. The errors due to taking only three terms of € ( ! I + ) are also estimated. The results show the corrections to earlier one-term approximations, and thereby indicate the validity of the corresponding sim...

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An experimental study of the thermal rebound effect of nanometer aerosol particles

Cited by 9 publications

References 5 publications

An Overview of Airborne Nanoparticle Filtration and Thermal Rebound Theory

An Overview of Airborne Nanoparticle Filtration and Thermal Rebound Theory

Les nanoparticules dans l'air, génération, détection et granulométrie

Developed turbulent transport in ducts for large prandtl or schmidt numbers

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