The magnitude of the circulation driving force in the reboiler (points)
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The bottom reboiler relies on the hydrostatic head of the liquid in the reboiler bottom and the density difference of the two-phase flow within the reboiler to generate a driving force that enables thermosiphonic movement; what are the main factors that influence the magnitude of this driving force?
Reply 1# sxf1028102800: The heat transfer coefficient for the heat transfer process across a flat wall is 100, that of the hot fluid is 200, and that of the cold fluid side is 250. The thickness of the flat wall is 5 mm. Please help calculate the thermal conductivity of the flat wall as well as its thermal resistance I earnestly request your guidance – a detailed algorithm! Thank you :)
Vacuum level and saturated vapor pressure
It is related to the tower bottom liquid level and the heating rate
Reply to 2# qingfengzhiyou: If the thermal conductivity is X, then: 1/100 = 1/200 + 1/250 + 0.005/X. Thermal resistance: 0.005/X
Reply to 5# cl6119: I’ve benefited! Thank you! :)
Factors affecting the driving force of circulation in a thermal siphon reboiler include vaporization rate, temperature difference, heat flux density, two-phase flow pattern, pressure drop, flow velocity, etc.
The vaporization rate can be used as a guiding parameter; a higher vaporization rate means greater driving force. However, increasing the vaporization rate depends on factors such as heating power and vacuum level
May I ask what specific height range is referred to by the difference in liquid level between the tower bottom and the reboiler elevation?
It generally refers to the height difference between the liquid level in the tower bottom and the top plate of the reboiler.