Hi Brian and Michael,

Thanks for the input and advice I am modelling a flange for a heat exchange unit and came up with this as a manual solution.
A series of semi circle arcs which I used unwrap curve. Worked out the length of each curve and used array over curve once I knew how many per curve. Gave a good enough result not perfect but should disperse heat even enough. Will explore Circle Packing in Rhino but was on tight time frame on this one so sometimes time spent learning new tricks versus getting the knuckles dirty and knocking it out.