Lab6DarcyFlowKey - smaller grain size samples gave a lower...

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Darcy Lab Discussion Questions – Key 1) There could have been pressure drop in the tubing in the experiment, but its diameter was fairly large relative to the pore throat size between the grains, so I wouldn’t think it would cause much trouble. The other factor that could cause extra pressure drop is the small diameter in the “valve” for the water source, and the pressure drops associated with the changing in diameter in the flow line, which can cause what is called a Bernoulli effect. 2) Smaller grain size gives lower permeability. The reason would be that squeezing through smaller pore throats takes more energy, so there is more pressure drop across the sample for smaller grain size for a given amount of flow. For our constant head experiments, the pressure drop is constant, so the
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Unformatted text preview: smaller grain size samples gave a lower flow rate for the same pressure drop. 3) This shows that the flow rate increases when the delta P increases, which is consistent with Darcys law, which has the flow rate linearly proportional to delta P. 4) Darcys law would predict a y intercept of 0, because when delta P is 0, the flow should be 0. However, the data shows that the y intercept is non zero for some of the samples. This could be a result of an extra pressure drop in the system which we are not accounting for. 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 2000 4000 6000 8000 10000 FlowRate,cc/s Pressure Drop, Pa Sand small beads large beads...
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Lab6DarcyFlowKey - smaller grain size samples gave a lower...

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