skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Artificial Micro/Nanomachines in Low Reynolds Number Environments.


Abstract not provided.

Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Proposed for presentation at the MRS meeting held April 6-9, 2015 in San Francisco, CA.
Country of Publication:
United States

Citation Formats

Paxton, Walter F. Artificial Micro/Nanomachines in Low Reynolds Number Environments.. United States: N. p., 2015. Web.
Paxton, Walter F. Artificial Micro/Nanomachines in Low Reynolds Number Environments.. United States.
Paxton, Walter F. 2015. "Artificial Micro/Nanomachines in Low Reynolds Number Environments.". United States. doi:.
title = {Artificial Micro/Nanomachines in Low Reynolds Number Environments.},
author = {Paxton, Walter F},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2015,
month = 4

Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • In flames molecular diffusivities are enhanced by the high temperatures and can be of the same order as turbulent diffusivities in flames of moderate Reynolds number. A perturbation analysis is used to quantify differential diffusion effects in a hydrogen/air diffusion flame which arise from differential molecular diffusivities. The analysis uses perturbations about the equal diffusivity, adiabatic, equilibrium theory commonly used and yields solutions for the average and higher moments for the departures in normalized element mass fractions and enthalpy. The results are compared with the laser-Raman measurements of M.C. Drake et al. in a relatively low Reynolds number flame. 24more » refs.« less
  • The motion and transport mechanisms of a condensing droplet initially contaminated with surfactant material are examined through a theoretical approach. The effects of the surface active material on the strength of the internal motion of the droplet are determined from the total forces experienced by the droplet at the interface. The surface tension gradient force induced by the surfactant and the shear stress from the relative motion between droplet and its ambient vapor are evaluated on the droplet surface as major forces affecting the internal motion of the droplet. The strength of the internal motion ranges from one order ofmore » magnitude smaller than the free stream velocity for slight surfactant contamination to almost a complete stop in motion for high surfactant concentration.« less
  • Acoustic emission spectra have been obtained for non-premixed turbulent combustion from two small diameter laboratory gas burners, two commercial gas burners and a large gas burner in the firebox of a Babcock-Wilcox Boiler (50,000 lb steam/hr). The changes in burner size and firing rate represent changes in Reynolds number and changes in air/fuel ratio represent departure from stoichiometric proportions. The combustion efficiency was measured independently through gas analysis. The acoustic spectra obtained from the various burners exhibit a persistent shape over the Reynolds number range of 8200-82,000. The spectra were analyzed for identification of a predictable frequency domain that ismore » most responsive to, and readily correlated with, combustion efficiency. A simple parameter (consisting of the ratio of the average acoustic power output in the most responsive frequency bandwidth to the acoustic power level of the loudest frequency) is proposed whose value increases significantly and unmistakably as combustion efficiency approaches 100%. The dependence of the most responsive frequency domain on the various Reynolds numbers associated with turbulent jets is discussed.« less
  • Measurements of the burning rate and characteristic combustion times of a bituminous Kentucky coal, a sub-bituminous Montana coal and a Texas lignite were conducted in a jet of heated gas and in a small externally heated fluidized bed. Individual coal particles from 2 to 10 mm were tested at 871, 815 and 705/degree/C at 21% and 10.5% oxygen. The Reynolds number varied from 19 to 50 in the fluidized bed tests and up to 1000 in the jet tests. A volatile flame ignited after 2-12 sec and lasted for 10 to 60 sec. Char burnout occurred after 100 to 700more » sec. The reactivity (burning rate per unit surface area) of the volatiles varied from 0.83 to 2.3 mg/cm/sup 2/-s in the fluid bed tests and from 1.9 to 3.6 in the jet tests. The char reactivity varied from 0.3 to 1.3 mg/cm/sup 2/-s in the fluid bed tests and from 0.4 to 1.0 in the jet tests. 10 refs.« less
  • Low Reynolds number flow in and about a droplet is generated by an electric field. Because the creeping flow solution is a uniformly valid zeroth-order approximation, a regular perturbation in Reynolds number is used to account for the effects of convective acceleration. The flow field and resulting deformation are predicted.