"A First Course in Turbulence." Nuclear Science and Engineering, 49(2), pp. 244–245 Additional informationNotes on contributorsDavid G. ThomasAbout the Reviewer: David Thomas has been at Oak Ridge National Laboratory since 1952 except for one year as a NSF Senior Postdoctoral Fellow Cambridge University. Since 1964, he also Ford Foundation professor of Fluid Mechanics (part time) University Tennessee.

Abstract In the absence of turbulent fluctuations main effect a velocity gradient on floc properties is rearrangement particles within producing more dense structure. When suspension sufficiently dilute that floc‐floc collisions are negligible, limits diameter (1 + α) 5/3 < ( D f / p ) ⩽ 2 , where α ratio volume fluid immobilized in structure to solids as determined from hindred‐settling measurements. These results set an upper limit size. Under flow conditions principle mechanism leading...

Abstract The minimum transport velocity (defined as the mean‐stream required to prevent accumulation of a layer stationary or sliding particles on bottom horizontal conduit) vas determined in 1‐in. pipe for an aqueous suspension glass beads using having mean diameters 78 and 310 μ. results present study were combined with prior pneumatic‐ hydraulic‐transport data air water suspensions give unique minimum‐transport relation, valid larger than thickness laminar sublayer, that is which are...

Abstract Heat transfer and pressure‐drop measurements were made with non‐Newtonian aqueous thorium oxide suspensions. A comparison of the results two different kinds measurement allowed general features suspension heat to be readily identified, thus leading a clear understanding anomalies observed in previous studies. Data obtained at concentrations up 0.10 volume fraction solids, (1,000 g. thorium/kg. water) systems having tube diameters 0.318 1.030 in. In addition laminar‐flow data taken...

Elementary Ca2+ signals, such as ‘Ca2+ puffs’, which arise from the activation of inositol 1,4,5-trisphosphate receptors, are building blocks for local and global signalling. We characterized puffs in six cell types that expressed differing ratios three receptor isoforms. The amplitudes, spatial spreads kinetics events were similar each types. resemblance these suggests they a generic elementary signal and, furthermore, different isoforms functionally redundant at level subcellular Hormonal...

Abstract The minimum transport velocity (defined as the mean stream required to prevent accumulation of a layer stationary or sliding particles on bottom horizontal conduit) has been determined for flocculated thorium oxide and kaolin suspensions flowing in glass pipes. pipes ranged from 1 4 in. diameter, concentration was varied 0.01 0.17 volume fraction solids. Two flow regimes were observed depending suspension. In first suspension sufficiently concentrated be compaction zone hence had an...

Vortex street eddies shed from multiple cylinders located one behind the other in plane of flow were observed to interact a very complex fashion. Contraction, expansion, cancellation, and coalescence vortices occurred for different values cylinder separation Reynolds number. The results appear have important implications both turbulence promotion during heat or mass transfer theoretical interpretation vortex phenomena.

Abstract Both the rheological and hindered‐settling characteristics of small particle size suspensions (0.1 to 50 μ) are primarily determined by degree flocculation concentration suspension. Previous studies have shown that when laminar shear diagrams fitted Bingham plastic model, parameters τ y /ϕ 3 ϕ −1 In η/μ constants which proportional The present study showed these were value α from measurements (α is defined as ratio volume fluid immobilized floc structure solids in structure)....

Previous studies of (InsP₃)-evoked elementary Ca²⁺ events suggested a hierarchy signals; fundamental ("Ca²⁺ blips") arising from single InsP₃receptors (InsP₃Rs), and intermediate puffs") reflecting the coordinated opening cluster InsP₃Rs. The characteristics such release signals provide insights into functional interaction distribution InsP₃Rs in living cells. Therefore we investigated whether signaling is truly...

This research was conducted to evaluate the combination of electromigration and potassium permanganate as a potential remediation method for low-permeability media (e.g., soil sediment) contaminated with dissolved sorbed organic contaminants. The experimental procedure composed two stages: determination migration rates through homogeneous cores primarily qualitative analysis in more heterogeneous, two-dimensional scenarios. Results indicated that transport fine-grained porous clays can be...

Abstract Turbulent flow friction factors were determined for flocculated suspensions of thoria, kaolin, and titania in tubes 1/8‐ to 1‐in. diameter. The non‐Newtonian laminar data arbitrarily fitted with the Bingham plastic model. With this model range yield stress values was 0.018 1.39 lb. f /sq. ft., a maximum ratio coefficient rigidity viscosity suspending medium 11.1. volume fraction solids varied from 0.042 0.23. Two types behavior observed depending on value stress. For less than 0.5...

Research has been conducted to evaluate if electrophoresis could transport surface stabilized nanoscale zero-valent iron (nZVI) through fine grained sand with the intent of remediating a contaminant in situ. The experimental procedure involved determining rates polymer modified nZVI and hematite sands under an applied electrical gradient different physical chemical conditions. Results indicated can be accomplished by electrophoresis, found much higher than diffusion alone comparable those...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNON-NEWTONIAN SUSPENSIONS—PART IDavid G. ThomasCite this: Ind. Eng. Chem. 1963, 55, 11, 18–29Publication Date (Print):November 1, 1963Publication History Published online1 May 2002Published inissue 1 November 1963https://pubs.acs.org/doi/10.1021/ie50647a004https://doi.org/10.1021/ie50647a004research-articleACS PublicationsRequest reuse permissionsArticle Views418Altmetric-Citations30LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnhancement of Film Condensation Heat Transfer Rates on Vertical Tubes by WiresD. G. ThomasCite this: Ind. Eng. Chem. Fundamen. 1967, 6, 1, 97–103Publication Date (Print):February 1967Publication History Published online1 May 2002Published inissue 1 February 1967https://pubs.acs.org/doi/10.1021/i160021a017https://doi.org/10.1021/i160021a017research-articleACS PublicationsRequest reuse permissionsArticle Views210Altmetric-Citations26LEARN ABOUT...

Abstract The local and the average rates of forced convection through laminar boundary layers on a flat plate were shown to be markedly increased by locating small cylinders near outer edge layer. rate was strongly peaked directly beneath each cylinder; magnitude effect depended upon free stream velocity, spacing between cylinders, gap plate. Under optimum conditions, values as much 340%, while over 190%.