Ifyouhad to design a pipeline to transport molasses from one part of a factory to another how would the diameter of the pipeline for molasses differ from the diameter of the water pipes in the factory?

I would think that a flat oval shape or rectangle might work best for molasses. If it doesn't have the benefit of being heated on it's journey by a parallel hot water line below, maybe a pipe with a large surface area to the diameter ration would help in producing some friction to help heat the molasses.