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The residence time of a fluid parcel is the total time that the parcel has spent inside a control volume (e.g.: a chemical reactor, a lake, a human body).The residence time of a set of parcels is quantified in terms of the frequency distribution of the residence time in the set, which is known as residence time distribution (RTD), or in terms of its average, known as mean residence time.
The logarithmic residence time is a dimensionless variation of the residence time. It is proportional to the natural log of a normalized residence time. Noting the exponential in Equation (), the logarithmic residence time of a Gaussian process is defined as [5] [6]
The lake retention time for a body of water with the volume 2,000 m 3 (71,000 cu ft) and the exit flow of 100 m 3 /h (3,500 cu ft/h) is 20 hours.. Lake retention time (also called the residence time of lake water, or the water age or flushing time) is a calculated quantity expressing the mean time that water (or some dissolved substance) spends in a particular lake.
Residence time is the total amount of time a discrete quantity of reagent spends inside the reactor. For an ideal reactor, the theoretical residence time, , is always equal to the reactor volume divided by the fluid flow rate. [2] See the next section for a more in-depth discussion on the residence time distribution of a CSTR.
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The residence time distribution function is therefore a Dirac delta function at . A real plug flow reactor has a residence time distribution that is a narrow pulse around the mean residence time distribution. A typical plug flow reactor could be a tube packed with some solid material (frequently a catalyst). Typically these types of reactors ...
The current average rate for a 30-year fixed mortgage is 6.96% for purchase and 6.96% for refinance, up 5 basis points from 6.91% for purchase and 6 basis points from 6.90% for refinance this time ...
The current average rate for a 30-year fixed mortgage is 6.78% for purchase and 6.75% for refinance, a drop of 13 basis points from 6.91% for purchase and 17 basis points from 6.92% for refinance ...