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.
References in periodicals archive ?
To calculate the mean strain function, the residence time and the strain rate history of the fluid elements shall be obtained, and it can be accomplished by particle trajectory method [6, 35], For this purpose, N inert particles are distributed evenly in the flow inlet, and the location of each particle in the channel is estimated by integrating the velocity over time as follows [6]:
First, total residence time for reaction is typically limited to the 1 to 3 minute range due to restrictions on machine length, as well as process economics.
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.
Micro extruders allow for a short residence time in the barrel, which helps to minimise thermal degradation especially compared to traditional size extruders running at very low screw speeds.
The material subjected to longer residence time in the feed frame resulted in tablets that presented a slower dissolution of folic acid while the tablets from the low residence time had faster dissolution.
Using radiocarbon dating, Valier Galy and Timothy Eglinton found that organic carbon resides in the basin for anywhere from 500 to 17,000 years, and that downstream, in the Gangetic floodplain, the longest residence times range from 1,500 to 3,500 years.
The feed rate was varied in a way so that residence time in TFR can be changed from 5 sec to 50 sec.
Factors influencing web site residence time of the orb-weaving spider, Micrathena gracilis.
Whatever the application, the low quantity of product in the Turbulizer and short residence time provide efficient use of installed power.
One shows that rivers or lakes are not really so unlike the Earth's mantle or a volcano, when viewed in terms of residence times and reservoirs.
Because residence time is intrinsically controlled in segmented-flow processing systems, the heat transfer model can be used to determine microbial lethality.