residence time


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residence time

[′rez·ə·dəns ‚tīm]
(chemical engineering)
The average length of time a particle of reactant spends within a process vessel or in contact with a catalyst.
(nucleonics)
The time during which radioactive material remains in the atmosphere following the detonation of a nuclear explosive; it is usually expressed as a half-time, since the time for all material to leave the atmosphere is not well known.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
For our purpose of finding residence time, it does not matter what type of screw you have, but we will base this on the typical general-purpose (GP) screw.
Data of residence time distribution consistently show that increasing the feed rate at a given screw speed between 250 and 450 rpm shortens the mean residence time and narrows the distribution.
stearothermophilus spores at 135 C and at a residence time of less than 0.5 second, which was in agreement with the estimated thermal inactivation.
The number and size of the sections of the facility can be decided by the quantity of evaporated water during long-term cooling and the flow residence time. Table 1 shows the operating conditions of this integrated passive safety system according to the status of the research reactor.
During trajectories with an initial molecular configuration near the rims of the [beta]-CD, the guest tended to enter the cavity, remain inside forming an inclusion complex, or exit from it after a period (residence time i), depending on the length, composition, and atomic distribution of the guest.
In this article, the oil shale sample from Yaojie of Gansu province was pyrolyzed in an aluminum or iron retort to investigate influential factors, such as pyrolysis temperature, heating rate, residence time and particle size.
As a result, the 3 operational parameters selected were the inlet temperature ([T.sub.in]), the inlet fuel concentration (expressed via the respective fuel mass fraction, [Y.sub.fuel], defined as the ratio of the fuel mass over the total inlet mixture mass), and the total residence time in the PSR ([t.sub.res]).
Experimental Factors Run FACTORS Number Residence Time Paddle Speed Compression (1) (setting) Force (kN) (2) RT PS CF 1 Low 3 Low 2 Low 3 Middle 3 Low 3 High 4 Low 9 Low 5 Low 9 Middle 6 Low 9 High 7 High 3 Low 8 High 3 Middle 9 High 3 High 10 High 4 Low 11 High 9 Middle 12 High 9 High (1) The actual residence time was not calculated as the feed frame volume was not determined.
For most micro extrusion applications, conventional size extruders such as a 19 mm (3/4") and 25 mm (1.0") machines are not ideal because the long residence time in the barrel and screw channels will degrade the extrudate.
The ratio of the volume of the system ([V.sub.syst]) and the sum of volume of mixture ([V.sub.x]) with the absolute value of residual volume ([absolute value of [V.sub.r]]), is expressed in units of time, mean residence time of freshwater ([tau]), or hydraulic residence time of the system following equation (3).
"If carbon has a short residence time in soils, global warming can't speed up the rates too much of exporting carbon to the atmosphere," Galy said.