Difference between forced circulation and thermosiphonic circulation
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What is the difference between forced circulation and thermosiphonic circulation? Under what circumstances is forced circulation used, and under what circumstances is thermosiphonic circulation used? I hope everyone can give me some advice
Forced circulation requires external power to move the fluid, whereas thermal siphon circulation is driven by differences in specific gravity. For situations with a small difference in specific gravity (or small temperature difference) and high pipeline resistance, forced circulation is used; otherwise, thermosiphonic circulation is employed.
In fact, some viscous materials can first be subjected to forced circulation, and after that, heat siphonning can be used instead
Forced circulation refers to the process in which a fluid is made to circulate within a device under the action of external forces; this is what is known as forced circulation. The thermosiphonic cycle is a thermosiphonic motion that generates thrust due to a static pressure difference caused by the difference in liquid density, and it is referred to as the thermosiphonic cycle.
How to understand the driving force of thermal siphon? Is it the static head on the liquid side or the applied heat?
The driving force behind thermal siphonage is the lift force generated by the density difference, which creates the phenomenon of thermal siphonage; its direction can be in any direction in space, determined by the pipelines and equipment.
A forced-circulation reboiler is circulated by external force. Thermosiphonic systems are commonly used for viscous materials; they rely on the density difference between vapor and liquid as the driving force
The siphon effect is caused by the gravitational force between liquid molecules and the difference in potential energy; in other words, it utilizes the pressure difference in the water column to cause water to rise and then flow to lower areas. Since the water surface at the ends of the pipe is under different atmospheric pressures, water flows from the side with higher pressure to the side with lower pressure, until the atmospheric pressures on both sides are equal and the water levels in the container become the same, at which point the flow of water stops. It can be seen that the siphon effect is determined by the relative positions of the reboiler and the tower; thermal siphoning is generally used when the viscosity of the material is not too high and the heat exchange requirements are not too stringent.