Momentum Diffusion From a Slot Jet Into a Moving Secondary

1956 ◽  
Vol 23 (3) ◽  
pp. 437-443
Author(s):  
A. S. Weinstein ◽  
J. F. Osterle ◽  
W. Forstall
Keyword(s):  
Turbulent Mixing ◽  
Isotropic Turbulence ◽  
Single Parameter ◽  
Spreading Coefficient ◽  
Homogeneous Isotropic Turbulence ◽  
University Of Illinois ◽  
Secondary Stream ◽  
The University ◽  
Initial Turbulence ◽  
Tube Study

Abstract Results are presented for an experimental, impact-tube study of the diffusion of momentum for the isothermal, incompressible, turbulent mixing of a slot jet issuing into a slower moving secondary region. The symmetric spread of the jet into a uniformly flowing secondary stream of low initial turbulence is well correlated by phenomenological expressions based on assumptions suggested by the Engineering Experiment Station of the University of Illinois and extended in this paper to include the case of the slot jet issuing into a moving secondary. The single parameter upon which this correlation is based, the spreading coefficient, is shown to have an interesting interpretation in terms of the diffusion of a stream of fluid “particles” into uniformly flowing fields of homogeneous isotropic turbulence.

scholarly journals Turbulent Condensation of Droplets: Direct Simulation and a Stochastic Model

2009 ◽  
Vol 66 (3) ◽  
pp. 723-740 ◽  
Author(s):  
Roberto Paoli ◽  
Karim Shariff
Keyword(s):  
Turbulent Mixing ◽  
Isotropic Turbulence ◽  
Droplet Size Distribution ◽  
Temperature Fluctuations ◽  
Stochastic Equations ◽  
Direct Simulation ◽  
Homogeneous Isotropic Turbulence ◽  
Cloud Droplets ◽  
Droplet Condensation

Abstract The effect of turbulent mixing on droplet condensation is studied via direct numerical simulations of a population of droplets in a periodic box of homogeneous isotropic turbulence. Each droplet is tracked as a fluid particle whose radius grows by condensation of water vapor. Forcing of the small wavenumbers is used to sustain velocity, vapor, and temperature fluctuations. Temperature and vapor fluctuations lead to supersaturation fluctuations, which are responsible for broadening the droplet size distribution in qualitative agreement with in situ measurements. A model for the condensation of a population of cloud droplets in a homogeneous turbulent flow is presented. The model consists of a set of Langevin (stochastic) equations for the droplet area, supersaturation, and temperature surrounding the droplets. These equations yield corresponding ordinary differential equations for various moments and correlations. The statistics predicted by the model, for instance, the droplet area–supersaturation correlation, reproduce the simulations well.

scholarly journals Turbulence–flame interactions in lean premixed hydrogen: transition to the distributed burning regime

2011 ◽  
Vol 680 ◽  
pp. 287-320 ◽  
Author(s):  
A. J. ASPDEN ◽  
M. S. DAY ◽  
J. B. BELL
Keyword(s):  
Numerical Simulation ◽  
Turbulent Mixing ◽  
Isotropic Turbulence ◽  
Three Dimensional ◽  
Homogeneous Isotropic Turbulence ◽  
Mixing Processes ◽  
Lean Premixed ◽  
Three Dimensional Configuration

The response of lean (ϕ ≤ 0.4) premixed hydrogen flames to maintained homogeneous isotropic turbulence is investigated using detailed numerical simulation in an idealised three-dimensional configuration over a range of Karlovitz numbers from 10 to 1562. In particular, a focus is placed on turbulence sufficiently intense that the flames can no longer be considered to be in the thin reaction burning regime. This transition to the so-called distributed burning regime is characterised through a number of diagnostics, and the relative roles of molecular and turbulent mixing processes are examined. The phenomenology and statistics of these flames are contrasted with a distributed thermonuclear flame from a related astrophysical study.

Five Decades of Research Experience in Speech Anatomy and Physiology

2016 ◽  
Vol 1 (5) ◽  
pp. 4-12
Author(s):  
David P. Kuehn
Keyword(s):  
Ohio State University ◽  
State University ◽  
Research Experience ◽  
University Of Iowa ◽  
University Of Illinois ◽  
Anatomy And Physiology ◽  
The Ohio State University ◽  
Speech Science ◽  
The University ◽  
East Carolina University

This report highlights some of the major developments in the area of speech anatomy and physiology drawing from the author's own research experience during his years at the University of Iowa and the University of Illinois. He has benefited greatly from mentors including Professors James Curtis, Kenneth Moll, and Hughlett Morris at the University of Iowa and Professor Paul Lauterbur at the University of Illinois. Many colleagues have contributed to the author's work, especially Professors Jerald Moon at the University of Iowa, Bradley Sutton at the University of Illinois, Jamie Perry at East Carolina University, and Youkyung Bae at the Ohio State University. The strength of these researchers and their students bodes well for future advances in knowledge in this important area of speech science.

University Geographies and Folk Music Landscapes

2016 ◽  
Vol 33 (1) ◽  
pp. 92-116 ◽  
Author(s):  
David K. Blake
Keyword(s):  
Mass Culture ◽  
Folk Music ◽  
Traditional Music ◽  
Rural Landscape ◽  
Power Structures ◽  
Distant Object ◽  
University Of Illinois ◽  
Liberal Politics ◽  
Cultural Form ◽  
The University

By examining folk music activities connecting students and local musicians during the early 1960s at the University of Illinois at Urbana-Champaign, this article demonstrates how university geographies and musical landscapes influence musical activities in college towns. The geography of the University of Illinois, a rural Midwestern location with a mostly urban, middle-class student population, created an unusual combination of privileged students in a primarily working-class area. This combination of geography and landscape framed interactions between students and local musicians in Urbana-Champaign, stimulating and complicating the traversal of sociocultural differences through traditional music. Members of the University of Illinois Campus Folksong Club considered traditional music as a high cultural form distinct from mass-culture artists, aligning their interests with then-dominant scholarly approaches in folklore and film studies departments. Yet students also interrogated the impropriety of folksong presentation on campus, and community folksingers projected their own discomfort with students’ liberal politics. In hosting concerts by rural musicians such as Frank Proffitt and producing a record of local Urbana-Champaign folksingers called Green Fields of Illinois (1963), the folksong club attempted to suture these differences by highlighting the aesthetic, domestic, historical, and educational aspects of local folk music, while avoiding contemporary socioeconomic, commercial, and political concerns. This depoliticized conception of folk music bridged students and local folksingers, but also represented local music via a nineteenth-century rural landscape that converted contemporaneous lived practice into a temporally distant object of aesthetic study. Students’ study of folk music thus reinforced the power structures of university culture—but engaging local folksinging as an educational subject remained for them the most ethical solution for questioning, and potentially traversing, larger problems of inequality and difference.

The Early Years of the Jewish Presence at the University of Illinois

1992 ◽  
Vol 2 (2) ◽  
pp. 215-245
Author(s):  
Winton U. Solberg
Keyword(s):  
Higher Education ◽  
The United States ◽  
Early Years ◽  
Late Nineteenth Century ◽  
Characteristic Form ◽  
University Of Illinois ◽  
American Higher Education ◽  
Jewish Students ◽  
The University ◽  
The Church

For over two centuries, the College was the characteristic form of higher education in the United States, and the College was closely allied to the church in a predominantly Protestant land. The university became the characteristic form of American higher education starting in the late nineteenth Century, and universities long continued to reflect the nation's Protestant culture. By about 1900, however, Catholics and Jews began to enter universities in increasing numbers. What was the experience of Jewish students in these institutions, and how did authorities respond to their appearance? These questions will be addressed in this article by focusing on the Jewish presence at the University of Illinois in the early twentieth Century. Religion, like a red thread, is interwoven throughout the entire fabric of this story.

Small-scale energy cascade in homogeneous isotropic turbulence

2019 ◽  
Vol 4 (10) ◽  
Author(s):  
Mohamad Ibrahim Cheikh ◽  
James Chen ◽  
Mingjun Wei
Keyword(s):  
Isotropic Turbulence ◽  
Energy Cascade ◽  
Small Scale ◽  
Homogeneous Isotropic Turbulence
Sign in / Sign up

Export Citation Format

Share Document