This question is not a duplicate ...
Would wing fences or chord wise corrugated tape increase the efficiency of a short span wing?
I understand that larger span wings have less % span wise flow.
Which begs the question..... at least conceptually, couldn't you just use end plates and multiple wing fences to reduce span wise flow?
or even better, use some sort of corrugated tape, with corrugations running chord wise, like the corrugated skin of a blue whale?