Tethered methanol droplet combustion in carbon-dioxide enriched environment under microgravity conditions

2012 ◽  
Vol 159 (1) ◽  
pp. 200-209 ◽  
Author(s):  
Tanvir Farouk ◽  
Frederick L. Dryer
Keyword(s):  
Carbon Dioxide ◽  
Enriched Environment ◽  
Droplet Combustion ◽  
Microgravity Conditions

scholarly journals Cardiovascular System Response to Carbon Dioxide and Exercise in Oxygen-Enriched Environment at 3800 m

2015 ◽  
Vol 12 (9) ◽  
pp. 11781-11796
Author(s):  
Guohui Liu ◽  
Xiaopeng Liu ◽  
Zhifeng Qin ◽  
Zhao Gu ◽  
Guiyou Wang ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Cardiovascular System ◽  
Enriched Environment ◽  
System Response

PHOTOOXIDATION OF KETONES IN AN O18 ENRICHED ENVIRONMENT

1958 ◽  
Vol 36 (3) ◽  
pp. 421-424 ◽  
Author(s):  
J. R. Dunn ◽  
K. O. Kutschke
Keyword(s):  
Carbon Dioxide ◽  
Molecular Oxygen ◽  
Carbonyl Group ◽  
Low Temperatures ◽  
Large Fraction ◽  
Enriched Environment ◽  
Diethyl Ketone ◽  
Alkyl Groups

A technique is described in which the origins of the products of photooxidation of ketones can be obtained in respect to whether they arise from the carbonyl or the alkyl groups of the ketone molecule. This is accomplished with the use of reactant molecular oxygen which has been enriched in the O18 isotope. Application of this to the photooxidation of acetone indicates that a large fraction of the carbon dioxide contains the carbonyl group of the ketone and that acetyl radicals play an important role in the oxidation to temperatures at least as high as 175 °C. Propionyl radicals are much less stable, and, in the photooxidation of diethyl ketone, their reactions, other than decomposition, appear to be negligible at quite low temperatures. Some comment is made on the mechanisms of these photooxidations.

scholarly journals Heat transfer mode shift to adiabatic thermalization in near-critical carbon dioxide under terrestrial conditions

2021 ◽  
Author(s):  
Anatoly Parahovnik ◽  
Yoav Peles
Keyword(s):  
Heat Transfer ◽  
Carbon Dioxide ◽  
Acoustic Waves ◽  
Reduced Pressure ◽  
Piston Effect ◽  
Mode Shift ◽  
Transfer Mode ◽  
Sensing Technology ◽  
Critical Opalescence ◽  
Microgravity Conditions

Abstract Heat transfer via acoustic waves is referred to as adiabatic thermalization or the piston effect. Until now, adiabatic thermalization was believed to be a secondary effect that mostly occurs under microgravity conditions and is readily overpowered by mixing due to gravitational forces. However, this work revealed that in microsystems, adiabatic thermalization is a dominant heat transfer mechanism. A substantial shift in thermalization modes from vaporization to acoustic waves was observed through critical opalescence temperature measurements of carbon dioxide (CO2). The contribution of the piston’s effect increased from 4.3–77.6% when the reduced pressure increased from 0.86 to 0.99. The findings are used to explain the observed heat transfer enhancement that occurred concurrently with the reduction in the void fraction. Revealing the nature of the piston effect to enhance heat transfer will advance copious technological fields like space exploration, fusion reactors, data centers, electronic devices, and sensing technology.

scholarly journals Controlled Atmosphere Storage of `Redcoat' Strawberry Fruit

1992 ◽  
Vol 117 (2) ◽  
pp. 260-264 ◽  
Author(s):  
Richard B. Smith
Keyword(s):  
Carbon Dioxide ◽  
Enriched Environment ◽  
Controlled Atmosphere ◽  
Fruit Firmness ◽  
Strawberry Fruit ◽  
Maximum Enhancement ◽  
Controlled Atmosphere Storage ◽  
Controlled Atmospheres ◽  
Point Forces ◽  
Atmosphere Storage

Strawberries (Fragaria × ananassa Duch.) cv. Redcoat were stored at several temperatures and for various intervals in controlled atmospheres (CA) containing 0% to 18% CO2 and 15% to 21% 02. Bioyield point forces recorded on the CA-stored fresh fruit indicated that the addition of CO2 to the storage environment enhanced fruit firmness. Fruit kept under 15% CO2 for 18 hours was 48% firmer than untreated samples were initially. Response to increasing CO2 concentrations was linear. There was no response to changing 02 concentrations. Maximum enhancement of firmness was achieved at a fruit temperature of 0C; there was essentially no enhancement at 21C. In some instances, there was a moderate firmness enhancement as time in storage increased. Carbon dioxide acted to reduce the quantity of fruit lost due to rot. Fruit that was soft and bruised after harvest became drier and firmer in a CO2-enriched environment.

Apparatus to investigate liquid oxygen droplet combustion in hydrogen under microgravity conditions

2020 ◽  
Vol 91 (10) ◽  
pp. 105110
Author(s):  
Florian Meyer ◽  
Christian Eigenbrod ◽  
Volker Wagner ◽  
Wolfgang Paa ◽  
James C. Hermanson
Keyword(s):  
Liquid Oxygen ◽  
Droplet Combustion ◽  
Microgravity Conditions
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