There was also some discussion on whirlpooling earlier in this thread.
I made up a quick soft copper tube to test a whirlpool in my pot during my Sunday brew day, and after 2 batches, I think it does not work for an electric kettle. I ran it about 10 min after flameout, during the 15ish minute cooldown, and continued after pulling out the IC and Hop bags for maybe another 10 min. Until the hop bags were out the flow was clearly not very effective. Once the liquid level dropped near the bottom, there was no discernible trub pile. I'll bet the element totally messes up the flow on the bottom.
Or my tube just sucked, and did not work as it should have. I'll practice with some water and see what happens.
And I did learn one thing, when a hop bag gets sucked into the kettle outlet, it's a pain to get it unstuck. Right now it's just an open 1/2" pipe thread. I'm not sure how best to address this yet, although it only happened 1 time between the 2 brews.
I switched up my bittering hop containment between the 2 batches as well. My hop basket/screen seems to be getting a buildup on it, and is so fine I was not able to scrub it as so well. I already know it's too fine, so I'm looking at making a much larger one for better flow, and with coarser screen. The second batch had bittering hops in a free floating bag instead of the basket, and this is the one that got sucked into the outlet. The later additions were also in bags so I could leave them in until the cooldown was done. For 1 batch I let them float free and the other had them tied to the pot handles. The only difference I noted was that when they floated free the strings got tangled, but as they are totally different beers I can't compare flavor differences.