Why is the pressure at the top of the tower lower than the pressure at the bottom?
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Why is the pressure at the top of the tower lower than the pressure at the bottom? Please help, thanks!
Simply put, the steam generated at the bottom of the tower flows upward; of course, it moves from areas of higher pressure to those of lower pressure. There is pressure loss as steam passes through the tray.
The flow resistance in the gas phase increases, and at the same time, as some of the vapor condenses due to mass and heat transfer, the gas flow rate decreases.
Steam is added below, causing the liquid to vaporize; its volume increases and the pressure rises. The gas at the top is condensed, its volume decreases and the pressure falls
:victory: Okay, thanks for the advice:victory::victory:
It’s awkward; this question is quite tricky! !
At the bottom of the tower is the heat source, where steam is generated; it rises to the top of the tower where it is condensed, resulting in a decrease in the volume of gas and a drop in pressure
There is a reboiler at the bottom of the tower, which generates a vapor phase; this vapor phase rises and exchanges heat with the liquid phase, causing the temperature to drop and the pressure to decrease.
Gas flows from high pressure to low pressure, just like wind; this is the most straightforward explanation. The gas flow from the bottom of the tower to the top requires power or results in pressure loss.
Reply to 6# xxm86106: Can hesitation also earn points? The pressure difference is the driving force for gas flow, right? Let’s think about it too.
At the bottom, the volume of the vaporized gas expands, causing the pressure to increase naturally; whereas in the upper part, the gas is condensed, its volume decreases, and thus the pressure drops naturally