Introduction to Transport Processes in Chemically Reactive Systems

Rosner, Daniel E.

doi:10.1016/b978-0-409-95178-3.50008-7

Cited by 133 publications

(179 citation statements)

References 0 publications

Supporting

Mentioning

174

Contrasting

Unclassified

Order By: Relevance

“…The Cunningham slip factor, accounts for gas kinetic e †ects, in which the b \ (1 ] 1.26N Kn ), Knudsen number is the ratio of the molecular mean free path to the droplet radius. The dynamic viscosity of the (N Kn ) atmosphere is given by Rosner (2000) : Pruppacher & Klett (1978) ; and at we assume an asymptote of N Re \ 1000, This asymptote is appropriate to moderately oblate spheroids (Fig. 10-36 in Pruppacher & Klett 1978), which are C d \ 0.45. more appropriate to unknown condensates than the extreme case of smooth spheres.…”

Section: Discussionmentioning

confidence: 99%

Precipitating Condensation Clouds in Substellar Atmospheres

Ackerman

Marley

2001

ApJ

756

1,283

View full text Add to dashboard Cite

We present a method to calculate vertical proÐles of particle size distributions in condensation clouds of giant planets and brown dwarfs. The method assumes a balance between turbulent di †usion and sedimentation in horizontally uniform cloud decks. Calculations for the Jovian ammonia cloud are compared with results from previous methods. An adjustable parameter describing the efficiency of sedimentation allows the new model to span the range of predictions made by previous models. Calculations for the Jovian ammonia cloud are consistent with observations. Example calculations are provided for water, silicate, and iron clouds on brown dwarfs and on a cool extrasolar giant planet. We Ðnd that precipitating cloud decks naturally account for the characteristic trends seen in the spectra of Land T-type ultracool dwarfs.

show abstract

Section: Discussionmentioning

confidence: 99%

Precipitating Condensation Clouds in Substellar Atmospheres

Ackerman

Marley

2001

ApJ

756

1,283

View full text Add to dashboard Cite

show abstract

“…(4) The p50 is the p where Y = 0.5 and is a measure of the Hb-O 2 binding affinity. We use mixed-mean or bulk concentrations, c b , (6) to describe the average value of p or Y at a given axial position [27], where u(r) is the flow profile, R is the tube radius, r is the radial position in the tube, and z is the axial position in the tube. …”

Section: Hb Equilibrium Bindingmentioning

confidence: 99%

A quantitative framework for the design of acellular hemoglobins as blood substitutes: Implications of dynamic flow conditions

Cole

Vandegriff²,

Szeri

et al. 2007

Biophysical Chemistry

View full text Add to dashboard Cite

The delivery of oxygen to tissue by cell-free carriers eliminates intraluminal barriers associated with red blood cells. This is important in arterioles, since arteriolar tone controls capillary perfusion. We describe a mathematical model for O 2 transport by hemoglobin solutions and red blood cells flowing through arteriolar-sized tubes to optimize values of p50, Hill number, hemoglobin molecular diffusivity and concentration. Oxygen release is evaluated by including an extra-luminal resistance term to reflect tissue oxygen consumption. For low consumption (i.e., high resistance to O 2 release) a hemoglobin solution with p50=15 mmHg, Hill n=1, D HBO2 =3×10 −7 cm 2 /s delivers O 2 at a rate similar to that of red blood cells. For high consumption, the p50 must be decreased to 5 mmHg. The model predicts that regardless of size, hemoglobin solutions with higher p50 will present excess O 2 to arteriolar walls. Oversupply of O 2 to arteriolar walls may cause constriction and paradoxically reduced capillary perfusion.

show abstract

“…The first thermocouple measured the wet-bulb temperature of the vaporizing flow, while the second one measured the gas temperature. The fuel concentration in the vapor phase can now be obtained by equating the B number for heat and mass transfer assuming Lewis number of 1 and pure ethanol in the liquid phase [14].…”

Section: Experimental Arrangementmentioning

confidence: 99%

Structure of laminar coflow spray flames at different pressures

Russo¹,

Gomez²

2002

Proceedings of the Combustion Institute

View full text Add to dashboard Cite

Experiments were conducted on laminar spray diffusion flames of ethanol/argon burning in oxygen at pressures of 1 and 3 atm. The flames were physically characterized by measuring droplet velocities and sizes by phase-Doppler anemometry, and gas temperature by thin-filament pyrometry and thermocouples. The flames exhibited a cold core, where little vaporization occurred, surrounded by a primary diffusion flame enveloping most of the droplet cloud. Their structure was strongly influenced by the Peclet number for heat transfer that, by regulating the heat penetrating into the core, and, consequently, the growth of the thermal boundary layer, affected the droplet vaporization history. At pressures above the atmospheric, because of density effects on thermal diffusivity, the boundary layer growth above the burner was reduced and so was the vaporization region. Complete evaporation of the droplets before they reached the primary diffusion flame was ensured if a suitably defined Damkö hler number of evaporation, Da v , was smaller than 1. Conversely, if Da v Ͼ 1, droplets penetrated the flame, ignited by a flame transfer process that was captured photographically, and burned isolated on the oxidizer side. These conditions of internal or partial group combustion prevailed in the lower part of the flame. Farther up in the flame, this combustion regime progressively shifted toward that of external group combustion, with fewer and fewer direct droplet/flame interactions.

show abstract

Introduction to Transport Processes in Chemically Reactive Systems

Cited by 133 publications

References 0 publications

Precipitating Condensation Clouds in Substellar Atmospheres

Precipitating Condensation Clouds in Substellar Atmospheres

A quantitative framework for the design of acellular hemoglobins as blood substitutes: Implications of dynamic flow conditions

Structure of laminar coflow spray flames at different pressures

Contact Info

Product

Resources

About