Results 81 to 90 of about 539 (136)

Target gene responses differ when transcription factor levels are acutely decreased by nuclear export versus degradation.

Development
McGehee J, Stathopoulos A.
europepmc   +1 more source

Circadian control of dopaminergic signaling to the mushroom body regulates sleep through rhythmic Pka-C1 transcription in Drosophila

Solis BL, Nagoshi E.
europepmc   +1 more source

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APPLICATION OF THE MARKSTEIN NUMBER CONCEPT TO CURVED TURBULENT FLAMES

Combustion Science and Technology, 2004
Effects of large-scale stretching of premixed turbulent flames on flame speed are discussed and an extension of the classical Markstein number concept is proposed to parameterize flame speed modifications by the stretch rate. The concept is applied to fit various experimental data on the growth of the radius of expanding, statistically spherical ...
J Chomiak
exaly   +2 more sources

Some Issues of Using Markstein Number for Modeling Premixed Turbulent Combustion

Combustion Science and Technology, 1996
Various Markstein numbers are considered and the relations between them are discussed using qualitative estimations and numerical simulations of expanding and converging spherical laminar flames. Measurements with expanding spherical flames permit finding the Markstein number characterizing flame speed with respect to products.
Andrei Lipatnikov
exaly   +2 more sources

METHANE-AIR MARKSTEIN NUMBERS FROM MEASUREMENTS OF THERMOACOUSTIC INSTABILITY

Combustion Science and Technology, 2005
Markstein numbers characterizing the influence of stretch on the speed of thin laminar flames are determined computationally for lean and rich methane-air mixtures using results from a recent experimental study of thermoacoustic instability in a Taylor-Couette burner.
exaly   +2 more sources

Experimental study of Markstein number effects on laminar flamelet velocity in turbulent premixed flames

Combustion and Flame, 2008
Abstract Effects of turbulent flame stretch on mean local laminar burning velocity of flamelets, u n ¯ , were investigated experimentally in an explosion vessel at normal temperature and pressure. In this context, the wrinkling, A t / A l , and the burning velocity, u t , of turbulent flames were measured ...
R Suntz
exaly   +3 more sources

Curved and stretched flames: the two Markstein numbers

Journal of Fluid Mechanics, 2011
AbstractThe analytical result concerning the Markstein number of adiabatic flames was obtained in 1982 with the one-step Arrhenius model in the limit of a large activation energy. This result is not relevant for real flames. The form of the law expressing the flame velocity in terms of the total stretch rate of the flame front through a single ...
Clavin, Paul, Grana-Otero, Jose
openaire   +2 more sources

Some new results on Markstein number predictions

38th Aerospace Sciences Meeting and Exhibit, 2000
The flame speed of a premised flame is known to depend on curvature and local flow conditions, i.e. flame stretch. For flames in unconfined environments. both theory and experiment predict for weakly-stretched fla.mes a 1inea.r relationship bet.ween flame speed and stretch, and the sensitivity of this dependence is given in terms of the Markstein ...
J. Bechtold, M. Matalon
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Determination of Markstein numbers in counterflow premixed flames

Combustion and Flame, 2002
This paper attempts to settle a long-standing issue concerning the differences in Markstein numbers measured by different experimental protocols. Numerical simulations of a counterflow flame with full transport coefficients, but using a fictitious reactive mixture having properties close to those assumed in asymptotic laminar flame analysis, are used ...
Davis, Scott, Quinard, Joël, Searby, Geoffrey   +2 more
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Direct and indirect measurements of Markstein numbers of premixed flames

Combustion and Flame, 1990
Abstract This work reports experimental measurements of the Markstein number (sensitivity to strain and curvature) of premixed diluted flames of hydrogen, methane, ethylene, and propane. Measurements are made on weakly stretched freely propagating quasi-planar flames. Three different methods of deducing the Markstein number are presented and compared—
G. Searby, J. Quinard
openaire   +1 more source