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Vedha Nayagam
Case Western Reserve University
11Publications
4H-index
71Citations
Publications 11
Newest
Forman A. Williams44
Estimated H-index: 44
(University of California, San Diego),
Vedha Nayagam4
Estimated H-index: 4
(Case Western Reserve University)
Source Cite
2018 in Combustion and Flame [IF: 4.49]
Vedha Nayagam4
Estimated H-index: 4
(Case Western Reserve University),
Daniel L. Dietrich13
Estimated H-index: 13
(Glenn Research Center),
Forman A. Williams44
Estimated H-index: 44
(University of California, San Diego)
Abstract Millimeter-size fuel droplets burning in microgravity show substantial thermal expansion at earlier times in their burning history. Here, we develop a simple model that accounts for thermal expansion of the liquid fuel and compare it against experimental measurements. The results show that excellent agreement with measured droplet-diameter histories throughout the hot-flame period of combustion is obtained when the effect of thermal expansion is included.
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Daniel L. Dietrich13
Estimated H-index: 13
(Glenn Research Center),
R. Calabria1
Estimated H-index: 1
,
P. Massoli1
Estimated H-index: 1
... more
ABSTRACTThis article presents the results of experiments conducted aboard the International Space Station involving the combustion of large bi-component droplets of decane and hexanol (50/50 by volume) in air ambients with ambient pressures between 0.05 and 0.30 MPa. The experiments showed the presence of sustained low-temperature or cool-flame burning following radiative extinction of large droplets at ambient pressures greater than or equal to 0.10 MPa. The droplet diameters at cool-flame exti...
3 Citations Source Cite
Vedha Nayagam4
Estimated H-index: 4
(Case Western Reserve University),
Daniel L. Dietrich13
Estimated H-index: 13
(Glenn Research Center),
Forman A. Williams44
Estimated H-index: 44
(University of California, San Diego)
A Burke–Schumann description of three different regimes of combustion of a fuel droplet in an oxidising atmosphere, namely the premixed-flame regime, the partial-burning regime and the diffusion-flame regime, is presented by treating the fuel and oxygen leakage fractions through the flame as known parameters. The analysis shows that the burning-rate constant, the flame-standoff ratio, and the flame temperature in these regimes can be obtained from the classical droplet-burning results by suitabl...
4 Citations Source Cite
Vedha Nayagam4
Estimated H-index: 4
(Case Western Reserve University),
Daniel L. Dietrich13
Estimated H-index: 13
(Glenn Research Center),
Forman A. Williams44
Estimated H-index: 44
(University of California, San Diego)
Abstract Droplet combustion experiments carried out onboard the International Space Station, using pure fuels and fuel mixtures, have shown that quasi-steady burning can be sustained by a non-traditional flame configuration, namely a “cool flame” burning in the “partial-burning” regime where both fuel and oxygen leak through the low-temperature-controlled flame-sheet. Recent experiments involving large, bi-component fuel ( n -decane and hexanol, 50/50 by volume) droplets at elevated pressures sh...
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K. Seshadri28
Estimated H-index: 28
(University of California, San Diego),
N. Peters53
Estimated H-index: 53
(RWTH Aachen University),
Forman A. Williams44
Estimated H-index: 44
(University of California, San Diego)
... more
A skeletal chemical-kinetic mechanism for n-heptane cool flames is simplified to the maximum extent possible by introduction of steady-state approximations for intermediaries, following procedures employed previously in addressing two-stage ignition. A pair of ordinary differential equations in mixture-fraction space is thereby obtained, describing the quasi-steady structures of the temperature and heptylketohydroperoxide fields. Application of activation-energy asymptotics for the partial-burni...
2 Citations Source Cite
2015 in Combustion and Flame [IF: 4.49]
Vedha Nayagam4
Estimated H-index: 4
(Case Western Reserve University),
Daniel L. Dietrich13
Estimated H-index: 13
(Glenn Research Center),
Michael C. Hicks7
Estimated H-index: 7
(Glenn Research Center)
... more
Abstract Recent droplet-combustion experiments onboard the International Space Station (ISS) have revealed that large n-alkane droplets, following radiative extinction of the visible flame, can continue to burn quasi-steadily in a low-temperature regime, characterized by negative-temperature-coefficient (NTC) chemistry. In this study we report experimental observations of n-heptane, n-octane, and n-decane droplets of varying initial size burning in oxygen/nitrogen, oxygen/nitrogen/carbon dioxide...
27 Citations Source Cite
2015 in Resuscitation [IF: 5.86]
Matthew M. Kumar (Case Western Reserve University), Andrew D. Goldberg (Case Western Reserve University), Markos Kashiouris (Case Western Reserve University)... more
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Daniel L. Dietrich13
Estimated H-index: 13
(Glenn Research Center),
Vedha Nayagam4
Estimated H-index: 4
(Case Western Reserve University),
Michael C. Hicks7
Estimated H-index: 7
(Glenn Research Center)
... more
This paper summarizes the first results from isolated droplet combustion experiments performed on the International Space Station (ISS). The long durations of microgravity provided in the ISS enable the measurement of droplet and flame histories over an unprecedented range of conditions. The first experiments were with heptane and methanol as fuels, initial droplet droplet diameters between 1.5 and 5.0 m m, ambient oxygen mole fractions between 0.1 and 0.4, ambient pressures between 0.7 and 3.0 ...
28 Citations Source Cite
2014 in Resuscitation [IF: 5.86]
Matthew M. Kumar5
Estimated H-index: 5
(Mayo Clinic),
Andrew D. Goldberg2
Estimated H-index: 2
(Mayo Clinic),
Markos Kashiouris4
Estimated H-index: 4
(Mayo Clinic)
... more
Abstract Aim Delay in instituting neuroprotective measures after cardiac arrest increases death and decreases neuronal recovery. Current hypothermia methods are slow, ineffective, unreliable, or highly invasive. We report the feasibility of rapid hypothermia induction in swine through augmented heat extraction from the lungs. Methods Twenty-four domestic crossbred pigs (weight, 50–55kg) were ventilated with room air. Intraparenchymal brain temperature and core temperatures from pulmonary artery,...
4 Citations Source Cite
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