Flux Density of Salt in Horizontal Tube: How Does Advection Affect Transfer?

AI Thread Summary
The discussion focuses on calculating the flux density of salt in a horizontal tube connecting seawater and freshwater, with an emphasis on the assumption of no advection. The participant correctly converts seawater salinity from g/L to g/m³ but is uncertain about how to incorporate time into the velocity calculation. They express confusion about the concept of advection and its role in salt transfer through the tube. The inquiry highlights a need for clarity on how advection influences the movement of salt in this scenario. Understanding these principles is crucial for accurately determining the flux density in the given context.
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Homework Statement


What is the flux density of salt in a horizontal tube, 10cm in length, connecting seawater (salinity 30g/L) to a tank of freshwater (salinity ~0) assuming no advection occurs?


Homework Equations


J (g/m2s) = C (g/m3) x V (m/s)


The Attempt at a Solution


C = 30g/L * 1L/0.01m3 = 3000g/m3
The calculation is obviously really simple, but I'm not sure what to use for time when calculating velocity (m/s). I'm given the length 10cm, but I'm assuming time has something to do with the statement "assuming no advection occurs". I feel like I'm overlooking some basic assumption.
 
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What is advection? How can the salt be transferred through the tube?

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