【Daily Question】12.19 Term Explanation: Linear velocity in an empty tower
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This post was last edited by Catalyzing a Grain on 2016-1-4 at 11:31. Definition of a term: The linear velocity of the gas in an empty column refers to the ratio of the volume of gas rising in the distillation column per unit time to the cross-sectional area of the column; in other words, it is the distance that the gas rising in the column travels per unit time. Rewards for participation: +2 wealth for simple answers, +5 wealth for correct answers, +8 wealth for in-depth discussions. Activities available: “My Most Crazy” activity – +20 wealth. [Petroleum and Chemicals Activity] Registration page for “My Most Crazy” activity: http://bbs.hcbbs.com/thread-1487895-1-1.html (Source: Haichuan Chemicals Forum). [Petroleum and Chemicals Activity] Contest for the best SimSun font style: http://bbs.hcbbs.com/thread-1514512-1-1.html (Source: Haichuan Chemicals Forum)
The linear velocity in an empty tower is the volumetric flow rate of the gas phase inside the tower (m^3/s) divided by the cross-sectional area of the tower (m^2), with the unit being m/s.
That is, the linear velocity of the mixed gas calculated based on the cross-sectional area of the empty tower; the gas flow rate at the bottom of the tower is the highest, and it is generally this flow rate that is used for calculation. As the fluid flow rate changes, the frictional resistance between the two fluids also changes, which in turn leads to a series of alterations in the fluid flow pattern within the tower.
The linear velocity in an empty tower is also known as the fluidization velocity of an empty tower, apparent velocity, or bed void velocity – it represents the nominal velocity of the air within the cross-section of the bed.
Empty tower velocity (space velocity): Space velocity refers to the amount of feed that passes through a unit of catalyst per unit of time, and it reflects the processing capacity of the plant
Linear velocity of the mixed gas calculated based on the cross-sectional area of the empty tower
Empty tower linear velocity: It refers to the ratio of the volume of gas rising in the distillation tower per unit time to the cross-sectional area of the tower, that is, the distance covered by the rising gas within the empty tower per unit time.
The empty tower linear velocity refers to the ratio of the volume of gas rising in the distillation tower per unit time to the cross-sectional area of the tower, that is, the distance traveled by the rising gas within the empty tower per unit time.
Linear velocity in the empty tower: The linear velocity of the gas phase as it passes through the entire cross-sectional area of the tower.
Under operating conditions, the linear velocity of the gas through the cross-sectional area of the tower.
Empty tower linear velocity refers to the ratio of the volume of gas rising in the distillation tower per unit time to the cross-sectional area of the tower; in other words, it is the distance that the rising gas travels within the tower per unit time.